FAMILIES AND GENERA. 95 



CHAPTER XI. 



FAMILIES AND GENERA, 



T N this the families are arranged alphabetically, and the chief 

 -*- distinguishing marks of their constituent genera noted and 

 compared. The orders are given as facilitating reference to 

 the preceding chapter. 



Aeieulidse. (PROSOBRANCHIATA.) Plate xxiii, 

 Acicula, 398. 



Acmseidse. (PROSOBRANCHIATA,) Plate xxi. 

 Tectura, 319. 



Aetseonidse. (OPISTHOBRANCHIATA.) Plate xxx. 

 Action, 550. 



Adeorbidse. (PROSOBRANCIIIATA.) Plate xxiv. 

 Adeorbis, 438. 



^Eolididse. (OPISTHOBRANCHIATA.) Plate xxxi. 



JEolh, body limaciform, branchial processes in transverse rows, 

 tentacles four two dorsal, two oral, 591. ' 



Embletonia, tentacles two, 592. 

 Fiona, tentacles four, sub-dorsal, 593. 



Proctonotus, body depressed; tentacles four two dorsal, two 

 oral, 594. 



Antiopa, body ovoid, depressed, 595. 



Hero, body limaciform, branchial processes in one series, 596, 



Anatinidse. (EULAMELLIBRANCHIATA.) Plate xv. 

 Thracia, 174. 



AnomiidSB. (FILIBRANCHIATA.) Plate i. 

 Anomici, g, 10. 



Aplysiidse. (OPISTHOBRANCHIATA.) Plate xxx. 

 Aplysia. 577"579. 



