170 BULIMULUS-BOSTRYX-LISSOACME. 



Bulinus scalariformis BROD., P. Z. S., 1832, p. 31. SOWB., Conch. 

 Illustr., f. 13; Zool. Beechey's Voy., p. 144, pi. 38, f. 12. Bulimus 

 scalariformis ORB., Voy., p. 282. DESK, in An. s. Vert., viii, p. 272 ; 

 in Fer., Hist., p. 87, pi. 157, f. 29-31. REEVE, Conch. Icon., f. 129. 

 PFR., Monogr., ii, p. 217 ; vi, p. 140 ; Conchyl. Cab., p. 229, pi. 

 62, f. 19-21. HIDALGO, Journ. de Conch., 1870, p. 54; Viaje al 

 Pacif., p. 91. 



B. scalariformis is well-named, having much the aspect of a stout, 

 fine-ribbed Scalaria. It varies to an extraordinary degree in form, 

 specimens from some localities being far wider in proportion to their 

 length than others. To a less extent it varies in coloring. The 

 sculpture of close, regular, rounded riblets is characteristic of all 

 specimens, however, so that it is readily identified. B. scalariformis 

 is a common species in collections. 



B. RUSTICELLUS Morelet. PI. 49, figs. 23, 24. 



Shell umbilicated, ovate-acuminate, rather solid, irregularly rug- 

 ulose-striate, here and there subgranulate, scarcely shining, white ; 

 the spire projecting, acutely conical, apex smooth, pale corneous. 

 Whorls 6, convex, the last inflated, rounded at base, a little longer 

 than the spire ; aperture little oblique, acutely ovate, fulvous within ; 

 peristome simple, unexpanded, the margins converging, joined by a 

 callus ; columellar margin narrowly dilated above and reflexed. 

 Alt. 20, diam. 10* mill. (Morel}. ' 



On the ruins surmounting the hills around the valley of Jauja r 

 and (somewhat smaller and slightly more elongated specimens) from 

 Pomacocha, Peru (Angrand). 



Bulimus rusticellus MOREL., Journ. de Conch., viii, p. 373 (1860) ; 

 Series Conchyl., iii, p. 185, pi. 8, f. 5. PFR., Monogr., vi, p. 124. 



In form, this species has some resemblance to B. scalariformis, 

 which inhabits the same country, but not the same tract. It is a 

 larger species. The whorls of the spire, 6 in number, enlarge gradu- 

 ally, producing an acute and long cone, the last whorl, however, en- 

 larges considerably, so as to constitute two-thirds of the shell. The 

 suture is distinct, the umbilicus narrow, not deep, half covered by 

 the columellar expansion. 



B. DEVIANS Dohrn. Unfigured. 



Shell covered-perforate, oblong-turrited, rather thin, sculptured 

 with growth-strise, shining, bluish. Spire turrited, the apex rufous- 



