200 DRYM^SUS, SOUTH AMERICAN. 



The general form is more slender than in D. incequalis (Pfr.), the 

 spire longer and the aperture shorter, a trifle less than half the 

 length of shell. The divergence between the two species is not 

 great, however, and they may, perhaps, be found to integrade when 

 full series are brought together. The typical form of D. fusoides 

 (Orb.) has less bold color markings and narrower lip. 



This species has been referred to Z>. orthostoma Smith, but it ap- 

 pears to be distinct. In orthostoma the color streaks are sinuous or 

 scalloped, forming three imperfect bands of lunate spots ; the aper- 

 ture is almost vertical and quite narrow, while in petasites there is 

 no tendency to form spiral rows of spots by flexure of the bands, the 

 aperture is noticeably oblique and decidedly wider. 



D. ORTHOSTOMA (Smith). PI. 36, fig. 38. 



Shell elongated, ovate-fusiform, slightly rimate, thin, spirally very 

 delicately striated, and sculptured with growth lines; whitish or 

 brownish-white, painted with longitudinal, slightly oblique, waved 

 purple-brown lines and transverse interrupted darker bands (2 on 

 the upper, 3 on the last whorl). Spire lengthened, convexly conic, 

 the apex a little obtuse. Whorls 62, slightly convex, the last long, 

 ascending a very short distance behind the lip. 



Aperture nearly vertical, elongate, inversely ear-shaped, slightly 

 less than one-half the total alt., lilac colored inside, the stripes show- 

 ing by translucence ; columella twisted above, arcuate below ; peri- 

 stome thin, moderately expanded, white, the outer margin of the 

 columella rather straight. Alt. 37, diam. 11* mill. ; aperture 18 

 mill, long, 6 wide inside (Smith). 



Ecuador f 



Bulimus (Drymceus) orthostoma E. A. SMITH, P. Z. S., 1877, p. 

 364, pi. 39, f. 5. 



The description of this species is very similar to that of B. albo- 

 labiatus, yet the two species when viewed side by side have a very 

 different general aspect. The present species differs in having the 

 aperture rather longer, and the whorls are not constricted just 

 beneath the suture. The markings are not so bold or so deep in 

 color; the upper interrupted band is situated nearer the middle of 

 the whorls, and in the last whorl, which has not the reddish line which 

 winds round the base and along the exterior of the lip of B. albo- 

 labiatus, the markings cease at a short distance (about 4-5 mill.) 

 from the labrum, which is pure white within, and creamy on the 



