18 79-] MOLLUSCA OP COSTA RICA. 485 



38. Stenopus micans, n. sp. (Plate XL. fig. 15.) 



Shell narrowly perforate, depressedly conical, thin, shining, nearly 

 smooth, under the lens showing extremely faint oblique lines of 

 growth, light fulvous brown ; whorls 5, very slightly convex, the 

 last bluntly angled at the periphery; sutures impressed; base flatly 

 convex, with just traces of a very faint rudimentary keel between the 

 umbilicus and the periphery ; aperture semilunar ; outer lip simple, 

 thm ; columellar margin very slightly expanded towards the umbi- 

 lical region. 



Diam. 2, alt. 1| lin. 



Hub. Costa Rica. 



This species wants the marginal sutures and the thread-like carina 

 or the preceding one. 



39. Stenogyra octona ?, Chemn. (Plate XL. fig. 1 6, animal.) 

 This species comes remarkably close to 8. octona, Chemn., which 



has a wide range, being found in Guayaquil, Brazil, and the West-In- 

 dian islands I cannot detect any difference between this species 

 and 6. trochlea, Pfr., the habitat of which is given as Peru 



Many specimens. 



Gabb gives as the habitat "Old Harbour." He describes the 

 animal as " yellowish white, and wrinkled." 



40. Stenogyra octonoides, C.B. Ad., =8, contractu, Poey. 

 Two specimens only. Costa Rica. 



41. Stenogyra gabbiana, n. sp. (Plate XL. fig. 17.) 



Shell perforate, elongately turreted, moderately thin, pale straw- 

 coloured, sculptured with somewhat distant raised thread-like de- 

 scending stria?, that are strongest on the upper whorls and become 

 evanescent towards the sutures and the base of the last whorl • 

 whorls 8, convex; apex blunt, papillose; aperture vertical, qua- 

 drately semilunar; outer lip arcuate, thin, simple; columellar 

 margin a little expanded over the perforation. 



Diam. li, alt. 3± lin. 



Eab. Costa Rica. A single specimen. 



A somewhat sparsely and strongly ribbed species, distinct from S. 

 caraccasensis, Reeve, which is described by that author as a Bulimus. 



42. Leptinaria interstriata, Tate. 



Tornatellina interstriata, American Journ. Conch. 1870, p. 157. 



Shell minutely rimate, elongately ovate, turreted, thin, hyaline, 

 ornamented with somewhat distant, raised, slightly curved longi- 

 tudinal striae, that disappear towards the middle of the last whorl ; 

 whorls 6, convex ; apex blunt, papillose ; sutures margined ; aper- 

 ture ovately semilunar ; outer lip simple, thin, arcuate ; columella 

 with a single sinuous fold truncated below. 



Diam. \\, alt. 3 lin. A single specimen. 



Hab. Costa Rica. 



