148 HOMORUS, WEST AFRICA. 



suture. The color is chestnut-brown, glossy and uniform 

 (Morel). 



25. H. NEBULOSUS (Morelet). PI. 57, fig. 37. 



Shell turrited, thin, smooth, glossy, buff-corneous, a wide 

 paler band along the suture. Spire very straight, gradually 

 tapering, the apex somewhat obtuse. Whorls 15, planulate, 

 joined by an impressed suture, the last slightly angulated at 

 the base, nearly one-fifth the total length. Columella arcu- 

 ate, obliquely truncate. Aperture oval, biangular, the outer 

 margin simple, unexpanded. Length 27, diam. 5 mm. 

 (Morel.). 



West Africa : Landana, above the mouth of the Congo river. 



Stenogyra nebulosa MOREL., Journ. de Conch. 1883, p. 400, 

 pi. 10, f. 5.Subulina nebulosa CROSSE et FISCHER, in 

 Grandidier, Madagascar, Moll., pi. 24, fig. 3, a, b. 



According to Morelet this species closely resembles Subu- 

 lona fraseri ( involuta) ; the two being of the same size, and 

 alike in polish, luster and nearly so in color; but nebulosa 

 is thinner, more slender, more regularly increasing, with 15 

 whorls, which are smooth, very glossy, etc. I do not know 

 why this species has been figured among the mollusks of 

 Madagascar. 



26. II. MARTENSI Dupuis et Putzeys. PI. 60, fig. 78. 



Shell solid, a little shining, elongate, subulate; pale-buff 

 or whitish, covered with a chestnut epidermis, painted with 

 transverse blackish flames. Whorls 11, the second depressed- 

 convex, forming a mamillar apex with the first whorl; fol- 

 lowing whorls rather convex, slowly and regularly increas- 

 ing, striated with very fine oblique growth lines, here and 

 there iregularly plicate transversely; decussated with numer- 

 ous inequidistant microscopic spiral striae; the last whorl is 

 indistinctly subangulate ; suture oblique, rather deep, usually 

 margined below. Aperture blue-whitish, a little acuminate 

 above, slightly exceeding one-fifth the length of the shell. 

 Columella regularly arcuate, covered with a very thin white 

 callous, anteriorly abruptly truncate. Lip thin, regularly 



