﻿i.AMT'sn.is 169 



I only know of a single specimen of this species, the tvpe, 

 and this consists of two fairly well matched, but badly eroded, 

 dead valves, which probably come from, young shells. The 

 beak cavities each have a hi rid bronze blotch, but do not ex- 

 hibit, so far as I can see, any pits. The posterior end of the 

 shell is slightly pointed and biangmlate on the median line. 

 The radial, dark ridges on the posterior slope are much like 

 those of members of this group, and the shell has some resem- 

 blance to a young tnnbrosa, but I cannot be sure where it 

 belongs. 



Group of Lampsilis saladoensis. 



Shell smooth, obovate, inflated, inecjuilateral, rounded be- 

 hind, thin, slightly thicker in front ; beaks somewhat promi- 

 nent, nearly smooth ; epidermis yellowish-olive, shining, rayed ; 

 there is a slight carina high up on the posterior slope ; pseudo- 

 cardinals small, lamellar and oblique ; laterals lamellar and 

 curved; anterior cicatrices distinct and well impressed; poste- 

 rior cicatrices confluent ; dorsal cicatrices under the plate, be- 

 tween the pseudocardinals and laterals ; nacre bluish-white and 

 iridescent. Animal unknown. 



Lampsilis saladoensis (Lea). 



Shell obovate, rather thin, much inflated, with full, high beaks 

 almost destitute of sculpture, with a full, somewhat double pos- 

 terior ridge ; rounded and narrowed in front with a slight post- 

 dorsal wing; surface pale yellowish-green in the young shell, 

 olive-green when older, 'with numerous feeble, .wide rays on the 

 posterior half of the shell, which are evenly spaced ; epidermis 

 smooth and shining ; left valve with a single, somewhat com- 

 pressed pseudocardinal which may be bifid, and two remote, 

 delicate laterals ; right valve with two nearly equal pseudocar- 

 dinals and one short, truncated lateral ; beak cavities deep, not 

 compressed ; nacre bluish-white in the young shell, having a 

 reddish-salmon tint in the cavity of the older shell ; adductor 

 scars shallow ; dorsal scars apparently wanting. The female 

 shell is quite narrow in front and has a wide, rounded, quite 

 prominent marsupial swelling, which reaches forward to the 



