Diagnostic characters and classification from Phylum Protozoa to Echinodermata. Laboratory Skills
Unfortunately, I couldn't find a direct link to download the PDF of "Practical Zoology: Invertebrates" by S.S. Lal for free. However, you can try searching on online repositories, such as:
Dr. S.S. Lal's manual is a staple for undergraduate and postgraduate students because it covers the practical syllabus for virtually all major Indian universities. Its content includes:
Includes diagnostic characters and natural history for hundreds of museum specimens like Leucosolenia , Sycon , and Euplectella .
While the allure of a free PDF is strong, veteran professors almost universally recommend the physical book.
: Detailed studies from Phylum Porifera to Echinodermata.