14 BULIMULUS-SCUTALUS. 



B. proteus varies wonderfully in size, degree of coarseness of the 

 granulation, and coloring. Specimens intergrading with B. mutabilis 

 will probably occur, but in examining extensive series of each, I 

 have not found completely intermediate forms. 



B. MUTABILIS (Broderip). PI. 1, figs. 6, 8, 9, 10, 3. 



Shell ovate-turrited, with open umbilicus, moderately solid or 

 rather thin ; densely granulated by spiral impressed striae cutting 

 close strong and rather irregular growth-wrinkles. Whitish or 

 yellowish, with (a) six spiral brown bands, or (&) irregular brown 

 oblique streaks, or (c) spotted and streaked with umber brown in 

 elegant pattern, and with a light girdle below the periphery. Whorls 

 6 to 6, rather convex ; apex obtuse, the earlier whorls densely 

 punctate in criss cross pattern, vertically striolate below. 



Aperture about half the length of shell, nearly vertical; outer lip 

 thin, flaring ; columella reflexed ; parietal callus slight. 



Alt. 3H, diam. 17 mill. 



Alt. 32, diam. 15 mill. 



Alt. 27, diam. 15 mill. 



Peru, at Truxillo and Santos (Cuming) ; Lima (Paz). Under 

 stones. 



Bulinus mutabilis BROD., P. Z. S., 1832, p. 108. Sows., Conch. 

 111., f. 15*. Bulimus mutabilis PFR., Conchyl. Cab., p. 257, pi. 70, f. 

 1-4; Monogr., ii, p. 62. HIDALGO, Journ. de Conchyl., 1870, p. 

 47._ B. sordidus KEEVE (not Lesson), pi. 17, f. lOOb (and lOOa?). 



Very closely allied to B. proteus, but it is smaller, more slender, 

 with longer and slimmer spire, and the aperture is smaller in pro- 

 portion. Reeve unites the two ; and it is not unlikely that mutabilis 

 should take subspecific rather than specific rank. 



B. PROTEIFORMIS Dohrn. 



Shell profoundly rimate, ovate-conic, solid, irregularly striated, 

 white. Spire conic. Whorls 5 to 6, rather flat, the last more or 

 less inflated, compressed around the umbilicus, ascending in front. 

 Aperture vertical, acuminate-ovate, brown, unicolored or white- 

 banded inside; peristome broadly expanded, acute, the margins 

 joined by a callus, columellar margin wide, flat. (Dohrn). 



Alt. 54, diam. 23 ; alt. of aperture 30, width 20 mill. 



Alt. 50, diam. 25 ; alt. of aperture 30, width 21 mill. 



Alt. 48, diam. 22 ; alt. of aperture 27, width 15 mill. 



