BULIMULUS-SCUTALUS. 25 



lacking, striation not conspicuous ; obliquely streaked or with inter- 

 rupted spiral bands. 



B. CULMINEUS (d'Orbigny). PI. 5, figs. 74-78 ; pi. 8, figs. 30-32. 



Shell narrowly perforate, ovate-conic, rather solid, whitish or 

 light brown with numerous narrow oblique brown streaks. Surface 

 irregularly wrinkle-striate, rather obsoletely decussated by spiral 

 lines. Spire conic, apex obtuse. Whorls about 6, moderately con- 

 vex ; sutures well impressed. 



Aperture somewhat less than half the shell's length, ovate ; outer 

 lip simple, columellar lip dilated above, columella concave or faintly 

 convex above. 



Alt. 32, diam. 15 mill. 



Alt. 25, diam. 13 mill. 



Bolivia ; Islands in Lake Titicaca, and on surrounding mountains ; 

 and to the south, the mountains of prov. Carangas, especially the Pu- 

 cara Mts., 5 leagues from Tot or a ; always at an elevation of 3,800- 

 5,000 meters (d'Orbiguy) ; La Paz (Stiibel) ; Peru, at Huancabelica, 

 2,000-2,200 meters alt. ; Andahuaylas (Angrand). Inhabits from 

 the snow-line to the temperate zone. 



Helix culminea D'ORB., Rev. Zool., 1835, p. 13. Bulimus cul- 

 mineus D'ORB., Voy. Amer. Merid., p. 288, pi. 33, f. 8, 9. PFR., 

 Monogr., ii, p. 221 ; vi, 143 ; Conchyl. Cab., p. 235, pi. 63, f. 1. 

 REEVE, Conch. Icon., pi. 54, f. 360. MORELET, Ser. Conch., iii, p. 

 178, pi. 8, f. 4. HUPE, in Castelnau Exped., p. 48, pi. 8, f. 4. 

 Bulinus culmineus SOWB., Conch. Illustr., f. 86. MARTENS, Conch. 

 Mittheil., pp. 162, 206, pi. 36, f. 10-12 (dentition and jaw). Buli- 

 mus jussieui (" VAL. in Mus. Paris ") PFR., P. Z. S., 1846, p. 33 ; 

 Monogr., ii, p. 186. REEVE, Conch. Icon., pi. 39, f. 242, not of 

 Valenciennes. 



The following color-forms occ.ur : 



a. Shell whitish. 



b. Buff, unicolored or streaked with corneous. 



. c. Chestnut-brown, unicolored or streaked with buff. 



Both around Lake Titicaca and at La Paz, Bolivia, Stiibel found 

 the slender, light colored form, and the stouter brownish yellow 

 shells, living together. 



My observation on this species are confined to moderate sized 

 specimens of typical coloring. Morelet's notes on those collected 

 by M. Angrand indicate a wide variability in the species. He 



