﻿CON IDEA 



4^5 



Quite different from the other species, being much shorter, 

 roimded on the post-basal termination, having: sharp beaks and 

 well-defined muscle scars. Heude says nothing about the color 

 of the epidermis. 



SOLENAIA CARINATA (Heude). 



Heude figures a fossil fragment of what is apparently a very 

 large Solenaia, but it may not be a recent species and it is not 

 in a condition to be described. 



Myce^opus carinatus Heude, Conch. Fluv. Nank.. HI. 1877. 



pi. XXI. fig. 45- 

 Solenaia carinata Suipson, Syn.. 1900. p. 657. 



Genus GONIDEA Conrad, 1857. 



Gonidca Conrad, Pr. Ac. Nat. Sci. Phila., 1867, P- i65- 



Shell elongated, subtriangular, much narrowed m front, 

 wide behind, inflated, subsolid, with a high, sharp posterior 

 ndcre- beaks rather sharp but not high, the sculpture consisting 

 of a few, strong, concentric bars; hinge with a rudimentary 

 pseudocardinal and lateral in each valve, though these are 

 sometimes wanting; dorsal scars forming a row withm the 

 shallow beak cavity ; muscle scars irregular; pallial line with a 

 trace of a sinus behind ; nacre lurid to purplish. 



Animal having the outer gills larger than the inner behind, 

 narrower in front, inner free from the abdominal sac all um- 

 ed to the mantle nearly to their posterior points ; mantle double 

 edged; branchial opening large, a few irregular, large and 

 small branched papilla on it; anal opening large, with rud - 

 n.entary papilla; superanal opening closed a long wa^ b lo^^^ 

 foot verv large when living. No ova were found m the 

 branchi^^of numerous specimens taken at difterent dates and 



localities. , ^ r • ?• r^„ui 



Type, Anodonta rmidaUi Trask and A. femmahs Gould. 



GONIDKA ANGUI.ATA (Lea). 



Shell elongated, somewhat triangular, narrowed in front 

 and wide behind, inequilateral, subsolid. general ymfla^e^^ 

 behind and tapering like a wedge to the anterior end, beaks 



