Member of phylum Echinoderm are exclusively marine and are largely bottom dwellers. All are relatively large sized animals, most being at least several centimeters in diameter. The most striking characteristic of this phylum is their pentamerous radial symmetry i.e., the body can usually be divided into five parts arranged around a central axis. The phylum contains about 6000 known species and constitutes the only major group of deuterostome invertebrates.
An Introduction to Echinodermata is the second revised and enlarged edition of the book. It has been designed to approach the morphology, anatomy, physiology and development of selected type in a simple and lucid style. According to the scheme of treatment the important animal types of the phylum have been dealt with first, and efforts have been made to present their elaborate and uptodate account. General characters and classification and brief description of other important types of the phylum have also been dealt with complete, authentic and uptodate account. Further separate chapters on topics of significance and general interest pertaining to the phylum have also been added to make the treatment more elaborate.

The protozoa are heterogeneous assemblage of some 50,000 cellular or single-cell organisms possessing typical (eukaryote) membrane bound cellular organelles. Being the simplest in structure, protozoa, are regarded most primitive or first animals (Gr.protos-first; zoon=animal) of nature.

An Introduction to protozoa is the second revised and enlarged edition of the book. It has been designed to approach the morphology, anatomy, physiology and development of selected type in a simple and lucid style. According to the scheme of treatment the important animal types of the phylum have been dealt with first, and efforts have been made to present their elaborate and uptodate account. General characters and classification and brief description of other important types of the phylum have also been dealt with complete, authentic and uptodate account. Further separate chapters on topics of significance and general interest pertaining to the phylum have also been added to make the treatment more elaborate.

Annelida consists of two words one is Latin annulus meaning a ring and a Greek eidos meaning form. Annelids are typical animals that burrow or crowl upon the bottom in the ocean or in fresh water.

And Introduction to Annelida is the second revised and enlarged edition of the book. It has been designed to approach the morphology, anatomy, physiology and development of selected type in a simple and lucid style. The approach to the discussion of all the types is very simple so as to impact to the students the clear and vivid understanding. According to the scheme of treatment the important animal types of the phylum have been dealt with first, and efforts have been made to present their elaborate and uptodate account. General characters and classification and brief description of another important types of the phylum have also been dealt with complete, authentic and uptodate account. Further separate chapters on topics of significance and general interest pertaining to the phylum have also been added to make the treatment more elaborate.

Students and teachers in the field will find this book of utmost use.

Coelenterate was formerly regarded as Phylum divided into two subphyla: Subphylum Cnidaria and Subphylum Acnidaria.
The name Coelenterate has been derived from two Greek words, Koilos-hollow, enteron-intestine. Thus the name of this phylum literally means hollow intestine but hollow bodies is considered more appropriate because actual intestine is not found in coelenterates.
An Introduction to Coelenterate is the revised and enlarged second edition of the book. It has been designed to approach the morphology, anatomy, physiology and development of selected type in a simple and lucid style. According to the scheme of treatment the important animal types of the phylum have been dealt with first, and efforts have been made to present their elaborate and uptodate account. General characters and classification and brief description of other important types of the phylum have also been dealt with complete, authentic and uptodate account. Further separate chapters on topics of significance and general interest pertaining to the phylum have also been added to make the treatment more elaborate.