BULIMULUS-BOSTRYX-ATAXUS. 131 



Bulimus umbilicaris SOUL., Rev. Zool., 1842, p. 102 ; Voy. Bonite, 

 Zool., ii, p. 513, pi. 29, f. 12-15. PHIL., Abbild. u. Beschreib., ii, 

 p. 11, pi. 3, f. 7. REEVE, C. Icon., pi. 66, f. 460. DESK, in Fer., 

 Hist., p. 74, pi. 145, f. 7-9. PFR., Conchyl. Cab., p. 84, pi. 30, f. 

 21, 22 ; Monogr., ii, p. 97 ; vi, 80. B. infundibuliformis JAY, Ann. 

 Lye. Nat. Hist. New York, iv, p. 169, pi. 10, f. 7 (1848). 



The very large, well-like umbilicus, is the most striking feature of 

 this well known species. 



B. TNFUNDIBULUM Pfeiffer. PI. 44, figs. 89, 90, 91, 92. 



Shell umbilicated, ovate-conic, somewhat fusiform ; closely striated, 

 opaque ; white (either uniform, or streaked with tawny, or one- 

 banded with ashen). Spire convex-conic, the apex attenuated, rose- 

 ate, rather acute ; suture linear. Whorls 9, nearly flat, the last 

 about three-sevenths the length of shell, attenuated at base, com- 

 pressed around the broad, penetrating, funnel-shaped umbilicus. 



Aperture subvertical, narrow, oblong ; peristome simple, the mar- 

 gins approaching above; right margin narrowly expanded, col- 

 umellar margin rather dilated. Alt. 18, diam. 7 mill. ; aperture 

 S mill, long, 3 wide. (Pfr.). 



Huanta and Pucra, Prov. of Ayacucho, Peru. 



Bulimus infundibulum PFR., P. Z. S., 1851, p. 255; Conchyl. 

 Cab., p. 85, pi. 30, f. 19, 20 ; Monogr., iii, p. 375 (1853). MORELET, 

 Ser. Conch., iii, p. 204, pi. 11, f. 6. 



This curious species, allied to B. umbilicaris of Bolivia, inhabits 

 the elevated country between the vallies of Abancay and Ayacucho, 

 occurring on grass in stony places. The specimens collected at 

 Huanta are generally 18 mill, long, corresponding to Pfeiffer's de- 

 scription. Those from Pucra, a colder locality, attain the size of 23 

 by 5? mill. The form streaked with tawny also occurs at this 

 place. (Morelef). 



Var. umbilicatellus Pilsbry. PI. 44, figs. 93, 94. 



Allied to B. infundibulum, but form slenderer, umbilicus decidedly 

 narrower, and aperture shorter. White, becoming bluish on the 

 spire, several of the earlier whorls deep purple-brown. Surface 

 sculptured with rather close, distinct strict, which become more sep- 

 arated and irregular on the last whorl, and are absent on the first 

 two. Whorls 8, rather convex, the last compressed at base, 

 angular around the narrowly funnel-shaped umbilicus. 



