488 APPENDIX 



without mouth or food-canal : Tfenia (195). Nemertini, body more 

 or less flattened ; food-canal with mouth and anus ; a separate pro- 

 trusible proboscis (190). 



NEMATHELMIiS'THES. Bilateral, unsegmented, round- 

 worms ; usually with alimentarj' tract, mouth, and anus : Ascaris 

 (191). 



ROTIFERA. Small aquatic Scolecida, with ciliated band 

 around mouth, and a special organ for attachment, the foot ; wheel- 

 animalcules. 



BRYOZOA. Scolecida in which the ciliated band is carried out 

 on a series of tentacles surrounding the mouth ; form colonies by 

 budding. Exdoprocta, Bryozoa with head and stalk, and crown 

 of tentacles surrounding both mouth and anus (177). Ectoprocta, 

 with anus outside tentacular corona (177). 



BRACHIOPODA. Shelled, with long, tentaeuliferous arms; 

 lamp-shells (ISO). 



MOLLUSCA 1 



Animals with unsegmented body and without jointed appen- 

 dages. Usually with a shell and with a muscular organ of locomo- 

 tion, the foot. 



LAMELLIBRAXCHIATA. JSIollusca with nearly symmet- 

 rical body, leaf-like gills, and a shell composed of two vah-es. 

 Lcr/iilir (2.3(3); Arcidce (2.34); Mytilida' (2.34); Aviculidcc (23.5); 

 Prctinidir (230) ; Oslreidce (230) ; Viiuniidic (228) ; Cydadid(F (230) ; 

 Maclridcc (231); Yenerida: (232); MijidiT (231); Solcnidcr (231); 

 Phohididrr (230); Teredid,^ (230). 



OASTROPODA. Mollusca witli head, feelers, and eyes, an un- 

 paired foot, and a shell that is univalve when present. Aiiphi- 

 NEURA, with strict bilateral symmetry, no externally visible gills, 

 and usually a shell composed of eight pieces : Chiton (220). Prcso- 

 BRANCHiATA, wlth gills in frout, shelled and operculate : Acmiridm 

 (219) ; I'nIdluUT (219) ; FUsiinUida- (219) ; NaticidiT (217) ; Ca- 

 lyptrcnida- (Crepidula, 218) ; Lillorl iiid<r (210) ; Muricidcr (Urosal- 

 pinx, 218) ; FoscioIariidfF (Pulgur, 217). Opisthobraxchiata, 



' This elassification, unlike that of the text, follows Cooke in his " Mol- 

 lusca." 



