oi-l 



lEDA (JJPTTERIA) 03RATA Ball var. SUBVITHEAMORPKA n. var. 



?Leda perlepida Guppy, 1867, ?roc. Soi . Assoc. Trinidad for 1867, 



p. 173, (ex parte) 

 ? Leda perlepida "uppy, 1874, Ceol. Mag., Decade 2, vol. 1, p. 



442 (cheok list), pi. 18, fif-, 9 (ex parte) 



Description .- Shell small, polished, transversely elongate, 

 virtually equilateral, notahly convex; ventral margin broadly arc- 

 uate, anterior margin abruptly rounde'^, posteriorly rostrate- the 

 rostrum being of medium length, blurit and slis-htly recurved; ujn- 

 bones tumid, strongly inc'Tved and opisthogyrate, placed approx- 

 imately at the median horizontal; escutcheon poorly defined, 

 bounded by a low rounde"* carina; area in front of beaks slightly 

 impressed, but not forming a lunule ; external surface sculptured 

 vrith fine ru?rae which are more sharply sculptured and crov/ded on 

 the distal half of the shell and are continuous across the im- 

 pressed areas both before and behind the bealrs; chondrophore rel- 

 atively narrow and elongate; ab:»ut sixteen teeth in tVie anterior 

 series and thirteen in the posterior; muscle scars relatively large 

 pallial sinus obscure. 



Dimensions .- length, 5.8 mm.; alt., 3.4 mm.; semidiam., 1.3 

 mm. 



