Contents. xiii 



CHAPTER XXXI. 



Page. 

 Deuterostomata Schizoccela. Class ii, Chsetopoda, .... 209 



CHAPTER XXXn. 



Deuterostomata Epiccela. Class 12, Bryozoa; Order i, Gymnolse- 



mata ; Order 2, Phylactolsmata, ...... 227 



CHAPTER XXXni. 



Class 13, Tunicata, 231 



CHAPTER XXXIV. 



Sub-kingdom VT. — Mollusca. Division, and Class i , Brachiopoda ; 



Order 1 , Ecardines ; Order 2, Testicardines, .... 241 



CHAPTER XXXV. 



Division 2, Otocardia. Class i, Lamellibranchiata ; Sub-class i, 

 Endocardines ; Sub-class 2, Exocardines; Order i, Mono- 

 mya; Order 2, Heteromya ; Order 3, Isomya, .... 255 



CHAPTER XXXVI. 



Class 2, Cephalophora ; Sub-class i, Scaphopoda ; Sub-class 2, 



Pteropoda ; Order i, Thecosomata; Order 2, Gymnosomata, . 272 



CHAPTER XXXVII. 



Sub-class 3, Gasteropoda; Order i, Branchiata ; Order 2, Piil- 



monata, ........... 280 



/ 



CHAPTER XXXVIII. 



Class 3, Cephalopoda ; Order i, Tetrabranchiata ; Order 2, Dibran- 



chiata, . . . . . . . . . . • Z^li 



CHAPTER XXXIX. 



Sub-kingdom VII. — Arthropoda; Division i, Branchiopoda. 



Class I, Crustacea, ...,,.... 327 



