344 COILOSTELE. 



Spanish Species. 



8. C. ACUS (Pfeiffer). PL 50, fig. 7. 



Shell very small, subimperforate, acicular, plicate-striate 

 under a lens, hyaline ; spire subulate, the apex rather obtuse. 

 Whorls 7 to 8, convex, the last less than one-fourth the total 

 length, rounded basally; columella subplicate. Aperture a 

 little oblique, oblong ; peristome simple, unexpanded, the colu- 

 mellar margin very narrowly reflexed. Length 3.75, diam. 

 0.75, aperture 0.66 mm. (Pfr.) 



Spain: Seville (Pfr.). 



Bulimus acus PFR., P. Z. S. 1852, p. 60; Monogr. iii, p. 395; 

 Conchyl. Cabinet p. 256, pi. 69, f . 12-14 ; cf. ANCEY, Journ. 

 de Conchyl. Hi, 1904, p. 302. Ccelestele lavigata BGT., Descr. 

 Coel. p. 12 (1880). C. castroiana BGT., Descr. Coel. p. 13. 

 C. hispanica BGT., Descr. Ccel. p. 14. 



This species is common in the drift debris of the Guadal- 

 quivir at Seville, the type locality of the several alleged species 

 included in the above references. Bourguignat ignores 

 Pfeiffer 's species acus, and bases three on what seem to be 

 merely slight differences due to individual variation and age. 

 Ancey was the first to recognize a Coilostele in Bulimus acus. 

 Coutagne (Comptes Bendus 1904, p. 1522) seems to think that 

 the ribbed and smooth Spanish species may be a Mendelian 

 mixture or dimorphic species, but gives no reasons for such 

 belief. 



9. C. SERVAINI Bourguignat. 



Shell imperforate, elongate-sealariform, slightly tapering, 

 elegantly striate, the striae regular, rather thick and slightly 

 obsolete; hyaline, glassy. Spire long, gradually tapering to 

 the obtuse summit. Whorls 7 to 8, the upper ones convexly 

 rounded, the rest scalarif orm, very much swollen above around 

 the suture, regularly and slowly increasing, the last a little 

 convex, slightly larger. Aperture very oblique, oblong, nar- 

 rowed above, rounded below, slightly subangular at the base 

 of the columella. Peristome unexpanded, slightly thickened, 

 and indistinctly spreading; columellar margin straight, thick- 



