﻿^S^ SOI.ICNAIA 



terior end. The beaks are somewhat eroded but they display 

 the doubly-looped sculpture (|uite tlistinctly, proving- that the 

 species is in no way related to Mycetopoda. 



Soi.ENAiA i'AJ,CATA (liiggins). 



Shell greatly elongated, very thin, inequilateral, subcoin- 

 pressed, the anterior end drawn downward and forward into 

 a long, rounded point ; from the anterior end the shell grad- 

 uallv and regularly widenslo the posterior end ; posterior ridge 

 angulated, ending behind in a point at the base of the shell ; 

 beaks low, their sculpture not seen ; surface with fine, uneven 

 growth lines, somewhat sulcate on the post-dorsal slope, and 

 strongly sulcated in front of the decided anterior ridge, with a 

 low, faint, radial depression above the posterior ridge ; epi- 

 dermis pale ashy-green with reddish tint on the central area ; 

 there seems to be a vestige of a lateral in each valve, and a 

 faint hint at a tooth near the beaks ; nacre lurid whitish, tinged 

 dull purple. 



Length 93, height 19.5, diain. 10.5 mm. 



Southeastern Asia? 

 Mvcetopus falcatus Higgins, Proc. Zool. Soc. Lond., 1868, p. 



179, pi. XIV, fig. 6. — SowERi5Y, Conch. Icon., XVI, 1868, pi. 



IV, fig. 9. — Clessin, Conch. Cab. Ano., 1875, p. 204, pi. lxvii, 



figs. I, 2. 

 Platiris (Mycctopiis) falcatus Lica. Syn., 1870, p. 90. 

 Solenaia falcata Simpson, Syn.. 1900, p. 656. 



This shell is almost a perfect miniature of S. emarginata. 

 It differs in being slightly more drawn out in proportion at the 

 anterior end, in being smoother and reddish on the central 

 area. It is a little more obliquely truncated behind i)erhaps 

 than emarginata, and the nacre is duller and more inclined to 

 be purple. I cannot be positive, but I am inclined to believe 

 that the shell has vestigial pseudocardinals and laterals. Its 

 texture and form would indicate that it was a Solenaia and not 

 a Mycetopoda, and I cannot hel]) but believe that the locality, 

 forest streams near Chyavetas, upper Amazon, where it was 

 -said to be discovered bv Mr. Piartlett. is an error and that it is 



