GENERA AND SPECIES. IOQ 



picta, % in. body yellowish white ; branchial processes 



spotted with brown and white. 



tricolor, i in. body pale yellow ; branchial processes ringed 



with golden yellow. 



farrani, J in. body whitish, with orange spots. 



adelaida, in. body orange red. 



exigua, in. body yellowish white, mottled with brown. 



viii. Branchial processes in a single row on each side 



despecta, ^ n - body white, with narrow green line down 



back. 



Alderia. (HERM&ID&.) Plate xxxi. 

 587. modesta, J in. branchial processes in six or seven diagonal 



Amphidesma. (MACTRIDJE.) Plate x. 

 107. castaneum, in x in. margin closely toothed. 



Ancula. (GONIODORID&.} Plate xxxiii. 



610. cristata, % in. three tripinnate branchial plumes, with five 



linear appendages on each side. 



Ancylus. (LIMNjfclDJE.) Plate xvii. 



205. lacmtris, ^in. xjin. beak sharp, and turning to left, mouth 



oblong. 



206. fluviatilis, \ in. x J in. beak blunt and turning to right, mouth 



oval. 



Anodonta. (UNIONID^E.) Plates vi., vii. 



58. anatina, 3^ in. x 2 r 1 ir in. oval, beak at a third from anterior end, 

 scars distinct. 



59- cygnea, 5^ in. x 2| in. oblong, beak at a fourth from anterior end, 

 scars indistinct. 



Anomia. (ANOMIID&.) Plate i. 



9. ephippium,2%in.. x 2 Jin. hinge plate broad, muscular scar of upper 

 valve with impressions of three inner por- 

 tions of muscle, plug cylindrical and thick. 



10. patelliformis, ijin. x ijin. hinge plate narrow, muscular scar of 

 upper valve with impressions of two 

 inner portions of muscle, plug pear-shaped 

 and thin. 



Antiopa. (MOLIDIDJE,'] Plate xxxi. 

 595. cristata, ij in. dorsal tentacles yellow, with white tips. 



hyalina, in. dorsal tentacles grey, spotted with brown 



and white. 



