62 



EPIROBIA. 



MARTENS, Biologia, Moll., p. 281. C. b. var. aibida F. & C., 

 t. c., p. 409. E. berendti, specimens from Chiapas, STREBEL, 

 t. c., p. 86, pi. 3, f. 7. 



Pfeiffer's type in Dohrn's collection has been examined by 

 Strebel. It is of a brownish-horn more or less dark color, on 

 which the fine riblets stand sharply out, their crests being 

 bluish- white or whitish. This white thickening often does not 

 extend over the whole extent of the rib, and frequently is 

 interrupted, when the ribs are not only less conspicuous to the 

 eye, but are really flatter. Quite exceptionally single or sev- 

 eral ribs are omitted. The axial tube has no inflations, but 

 there are thickened whitish striae and traces of the oblique, 

 short series of lamellae or long grains. 



Var. aibida (Fisch. & Crosse). 



Color whitish instead of violaceous brown. Length 12, 

 diam. 3 mm. 



State of Chiapas (Dr. Berendt). 



The dentition has been figured by Strebel (see pi. 20, fig. 4; 

 the basal plates are not visible owing to the strong imbrication 

 of the cusps). The formula is 17.10.1.10.17x200. In my 

 opinion this radula belongs to Holospira goldfussi, having 

 been transposed by error. 



E. SWIFTIANA (Crosse). PI. 20, figs. 20, 21, 22. 



Shell slightly rimate, fusiform-turreted, elongate, thin, sub- 

 pellucid, sculptured with very close, minute, whitish, arcuate 

 riblets, here and there obsolete, showing the ground-color of the 

 shell, which is quite glossy and corneous-brown ; an alternation 

 of brown and white, dull and glossy, being thereby produced. 

 Spire slender, entire, the apex rounded, submammillate ; suture 

 impressed. Whorls 21, convex, the first l 1 /^ smooth, glossy, 

 brown, the rest narrow, the last whorl rather shortly free, a 

 little protracted downwards, obsoletely subangular above and 

 below. Aperture subangulate-rounded, slightly oblique, pale 

 chestnut inside; peristome continuous, shortly expanded and 

 a little reflexed throughout, whitish. Length 18, diam. 2y 2 , 

 longest axis of aperture 2 mm. (Crosse). Mexico? 



