PLEKOCHEILUS-EURYTUS. 73 



Bulimus aulacostylus PFR., P. Z. S., 1852, p. 59 ; Conchyl. Cab., 

 p. 114, pi. 35, f. 5, 6; Monogr., iii, p. 316 ; iv, p. 380; vi, p. 23 ; 

 viii, p. 37. TATE, Ann. Mag. Nat. Hist., 1869, vi, p. 356. BLD., Ann. 

 Lye. Nat. Hist. N. Y., vi, 1858, p. 153. SMITH, Ann. Mag. N. H., 

 1889, iii, p. 403. B. lentiglnosus REDFIELD, Ann. Lye. Nat. Hist. 

 N. Y., vi, p. 14 (1853). 



The furrow at root of columella is characteristic ; the sculpture 

 not less so. Size and comparative width vary somewhat, and the 

 coloring is changeable within wide limits. It has been reported 

 from Trinidad and Demerara, but apparently incorrectly. A 

 specimen 43 mill, long is recorded by Smith. 



Group of B. coloratus. 



Ovate, granulated or decussate, the peristome narrow, expanded 

 or reflexed ; columellar fold weakly convex. 



P. ROSEOLABRUM Smith. PI. 38, fig. 97. 



Shell very narrowly rimate, ovate, acuminate above; minutely 

 granose-striate throughout ; ochraceous, irregularly ornamented 

 with scattered spots and oblique streaks. Whorls 4, nearly flat, 

 rapidly increasing, the last whorl large, obliquely descending in 

 front. Suture crenulated. 



Aperture oval, acuminate above, whitish-ochraceous inside, a little 

 less than two-thirds the length of shell ; columella oblique, arcuate, 

 visible as far as the apex ; peristome roseate, narrowly expanded 

 and reflexed throughout, the margins joined by a thin callus. Alt. 

 42, diam. 18 mill. ; length of aperture 26, width 14 mill. (Smith). 



Malacatos, south Ecuador. 



Bulimus (Eurytus) roseolabrum E. A. SMITH, P. Z. S., 1877, p. 

 362, pi. 39, f. 8. 



B. piperitus of Sowerby is the nearest ally of this species. From 

 that form the present one differs in being smaller and consisting of 

 a whorl less. The granulous sculpture is also different, and does 

 not display that transverse direction which is noticeable in B. piper- 

 itus. The brown spotting is far less abundant ; the general tint is 

 yellower; and the peristome is rose-colored and everywhere ex- 

 panded and reflexed, which is not the case with Sowerby's species, 

 in which it is usually white and scarcely shows any expansion or 

 reflexion ; however, I have seen some specimens of the Peruvian B. 

 piperitus with a pink lip. (Smith). 



