XV. 

 XVI. 



XVII. 



2. Lamellibranchiata. 



3. Cephalopoda. 



Polyzoa or Bryozoa. 



Clione, Doris, Eolis, Glaucus, Hyalea, 



Janthina, Styliola. 

 Lithodomus. 

 Argonauta, Benthoteuthis, Eledone, 



Loligo, Nautilus, Octopus, Sepia, 



Sepiola, Spirula. 



Bowerbankia, Cellularia. 



Brachiopoda (lamp-shells). Terebratula. 



Echinodermata : 



1. Holothuroidea (tre 



pangs). 



2. Crinoidea (feather- 



stars). 



3. Echinoidea (sea- 



urchins). 



4. Ophiuroidea (brittle- Ophioglypha. 



stars). 



5. Asteroidea (starfish). Archaster. 



Cladodactyla. 

 Antedon, Rhizocrinus. 

 Echinus, Salenia. 



XVIII. Chaetognatha. 

 XIX. 



Sagitta, Spadella. 



Chordata : 



1. Urochordata, or Tu- Appendicularia, Doliolum, Pyrosoma, 



nicata. Salpa. 



2. Hemichordata. Balanoglossus (Enteropneusta). 



3. Cephalochordata Amphioxus. 



(lancelets). 



4. Cyclostomata (lam- 



preys). 



5. Pisces (true fish). 



(1) Chondropterygii Raja, Chimasra, Scyllium. 



(sharks and 

 rays). 



(2) Teleostomi Argyropelecus, Gadus, Gobius, Lepado- 



(bony fish). gaster, Macrura, Regalecus, Scopelus, 



Scorpaena, Solea, Stomias. 

 Hydrus, Distira. 



6. Ophidia (snakes). 



7. Cetacea (whales) : 



(1) Mystacocoeti. 



(2) Odontocoeti. 



8. Pinnipedia (seals). 



Balaena, Balaenoptera, Megaptera. 

 Delphinus, Monodon, Orca, Phocaena, 



Physeter. 

 Otaria, Phoca, Trichecus. 



