﻿240 IMI.SIJKYOCONCHA 



liing-e edentulous or with the merest vestiges of teeth under 

 the beaks; beak cavities shallow, with a diagonal row of faint 

 scars ; nacre soft and shining, bluish or purplish, iridescent, 

 salmon-colored in the beak cavities. The specimen from the 

 Morelet collection belonging to the National Museum and 

 bearing Morelet's label Anodonta linquccformis differs quite a 

 little from the figure of the type and is probably a female shell 

 as it is considerably produced in the i^ost-basal region. The 

 figure of the type shows a shorter, higher shell, with no post- 

 basal inflation. Both are bluntly pointed about at the median 

 line. 



Length of type 105, greatest height 47, diam. 18 mm. 



Length of Museum_ specimen 9f), height 52, diam. 20 mm. 



Siam ; Cambodia. 

 Anodonta lingucuforniis Morelet, Ser. Conch., IV, 1875, p. 



329, pi. XIV, fig. 5. 

 Margaron fUnio) lingiucformis Lica. Syn., 1870, p. 48. 

 Pilsbryoconcha lingnccformis Simpson, Syn., 1900, p. 587. 



Morelet's measurements are of a longer, narrower shell 

 than the one described, his figure being 93 millimeters in length 

 and 55 in height. It may be that this is only a variety of Lea's 

 Anodonta exilis. 



Pilsbryoconcha suilla (von Martens). 



•'Shell oblong, inflated, rather thin, striate; epidermis black- 

 ish-brown ; roundly produced in front ; higher and more in- 

 flated behind ; dorsal margin subconcave anteriorly, j)oste- 

 riorly from the beaks to the sinulus quite ascending and ob- 

 tusely subalate, thence descending; posterior margin trun- 

 cate, subvertical ; ventral margin for the most part straight, 

 horizontal ; beaks depressed, with rather strong undulating 

 ridges, conspicuous even when eroded ; hinge line in front of 

 the beaks simple, narrow, slightly sinuous and at first sharply 

 descending, then rising, behind the beaks, convex, with a heavy 

 nacreous deposit and towards the sinulus decidedly wider; 



