96 SUBULINA, COMORO IS. 



For this species a section Nothapalus has been erected, char- 

 acterized by the shell resembling Curvella, with comparatively 

 large last whorl. 



Species of the Comoro Islands. 



S. ferriezi is a type of the prevalent form of Subulina in 

 the Comoro Is. These shells are very smooth and glossy, 

 with the whorls nearly flat or but weakly convex, and the 

 embryonic shell with a smooth suture, without crenulate bor- 

 der (pi. 13, fig. 30). All the species seem to conform to this 

 type except four. 



8. cereola no. 42, and 8. canonica no. 43, are finely striate. 



8. avenacea has the short contour of Opeas, and a very 

 oblique columellar truncation. It belongs I think to Opeas. 



S. octona, no. 1, easily recognized by its convex, smoothish 

 whorls and denticulate-bordered suture of the embryonic 

 shell, is found in Madagascar and the Seychelles. 



36. S. FERRIEZI (< Marie' Morelet). PI. 13, figs. 28, 30, 31. 



" Shell elongate, turrited, thin, smooth, pellucid, extremely 

 glossy, brownish horn colored. Spire subulate, apex rather 

 obtuse. Whorls 10, a little convex, suture impressed, smoothly 

 united, the last whorl not equal to one- fourth the entire length 

 of the shell. Columella arcuate, obliquely truncate. Aper- 

 ture oval ; peristome thin and unexpanded. Length 18, diam. 

 5 mm. 7 ' (Morelet). 



Comoro Is.: Mayotte I. (Marie). 



Stenogyra ferriezi Marie MS., MORELET Jour, de Conch. 

 xxx, p. 187, pi. 10, f. 12 (July, 1882). 



This shell, one of the most remarkable of the genus among 

 those which live in the Comoro Islands, approaches, in form 

 and size, the large individuals of Sten. striatella. But its 

 aperture is longer, and the shell, of a slightly darker rufous 

 tint, is smooth, glossy and absolutely black when the animal 

 is within. The whorls of the spire are but little convex, and 

 yet plainly separated by a suture bordered by a blackish line 

 which is more or less confluent with it. The suture as it 

 revolves becomes more oblique in the last whorls of the spire. ' ' 



