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 (6) 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 stnolate below. 



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

 thin, flaring ; columella reflexed ; parietal callus slight. 



Alt. 31 IT, 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. SOWB., 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 REEVE (not Lesson), pi. 17, f. lOOb (and lOOa?). 



i 



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 Dohm. 



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. (Dohrti). 



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. 



