V1H CONTENTS. 



PAGE 



13. MOLLTSCA, by Dr. F. Troschel 413 



Cephalopoda 420 



Ptcropoda 421 



Hetcropoda . 421 



Gasteropoda 424 



Tectibranchia . 430 



luferobranchia 430 



Pulraouata operculata . 432 



Cteuobranchia 433 



Brachiopoda . 439 



Testacea 439 



Ik HELMINTHOLOGY, by Professor C. T. V. Siebold 446 



Hclminthes gordiacei , 448 



nematodes 449 



acanthocephali . 467 



,, trematodes . 467 



cestodes . 474 



cystici . . . 478 



dnbii . 494 



Pseudohclminthes 498 



Supplement . 500 



15. WORMS, ZOOPHYTES, and PROTOZOA, by Prof. C. Th.V. Siebold 503 



Vermes annulati . 503 



Vermes turbellarii 516 



Echinodermata 



Acalephse . 527 



Polypi 533 



Protozoa (Infusoria and Rhizopoda) 541 



10. REPTILIA, by Dr. F. H. Troschel 543 



Chelonii . 547 



Sauri 547 



Serpentes . ' ' s 



Batrachia 550 



17. ICHTHYOLOGY, by Dr. F. H. Troschel 551 



Dipnoi 554 



Tcloostii . 55 1 



Anacanthini 



Pharyngopnathi 



Physostomi 563 



Plecto^natlii . , 5C) I 



St-lachii [Plagiostomi] " i/; i 



