xn 



PHYLUM MOLLUSCA 



721 



FIG. 638. Shell-bearing Pteropoda. /. /. fins ; 1. liver ; o. ovary ; s/i. shell. (From Cooke, 



after Souleyet.) 



\5 



FIG. 630. Atlanta peronii. a, cerebral ganglia; b, pedal ganglia; e. eye ; <r, etenidia; 

 h. heart ; k, kidney /. " liver " ; m. month ; o. ovary p. opercnlum ; t. testis. 



clcn 



pr-nb 



FIG. 640. Pterotrachea scutata. o/i. alimentary canal ; r/c/t. gills; <.'/'', eye ; fl. float"; 

 mo. mouth ; prob. proboscis ; repr. gonad ; alt. shield covering a portion of the dorsal 

 surface ; su. sucker. 



