AURIS-GONYOSTOMUS. 123 



tion of consequence is in the color of the peristorae, which may be 

 either white or rose. 



A. HYBRIDA Gould. PI. 43, fig. 75. 



Shell rimate-umbilicate, fusiform, like A. goniostoma in shape. 

 Dark or purple-brown, variegated with oblique flames and irregular 

 spots of yellow. Surface sculptured with conspicuous close and un- 

 equal spiral series of granules, and often superficially malleated. 

 Whorls 5-6, the last keeled at base, excavated in umbilical re- 

 gion. 



Aperture elliptical, angular at both ends, channelled at base, dull 

 purple within ; peristome narrowly reflexed throughout, rose col- 

 ored, or with the outer lip white. 



Alt. 46, diam. 17 mill. 



Alt. 41, diam. 15 mill. 



Brazil, around Rio Janeiro (U. S. Expl. Exped.), and in Organ 

 Mts.; Macahe (Paz and Martinez). 



Bulimus egregius PFR., P. Z. S., 1845, p. 67 (not of Jay, 1836) ; 

 Monogr., ii, 50 ; iii, p. 372. GOULD, Otia Conch., p. 244 ; U. S. 

 Expl. Exped., Moll., p. 77, pi. 6, figs. 86, 86a. REEVE, Conch. 

 Icon., pi. 34, f. 205. DESH. in Fer., Hist., p. 104, pi. 143, f. 7, 8.- 

 Bulimus hybridus GLD., Proc. Bost. Soc. N. H., ii, p. 191 (Dec., 

 1846); Otia Conch., p. 32. HIDALGO, Viaje al Pacif., p. 76.- 

 PFR., Monogr., iv, p. 440. 



The form is that of A. goniostoma, but the granulation is coarser 

 and more irregular, and it is conspicuously marked with yellow. In 

 size it is somewhat less than goniostoma. 



A. MULTICOLOR Rang. PI. 43, figs. 73, 74. 



Shell rimate-umbilicate, ovate-conic, rather solid. Irregularly 

 striped or maculated in ragged pattern with purple-brown on an 

 opaque white or olive clouded white ground, the dark streaks generally 

 dotted with white. Surface shining, densely sculptured with spirally 

 arranged granules, at least on the spire. Apex obtuse; whorls 5, 

 convex, separated by impressed and narrowly margined sutures, the 

 last whorl ovate, rounded below. 



Aperture somewhat over half the shell's length, oblong-oval, 

 rounded below, dark violet within. Peristome rather narrowly ex- 



