NEOPETR^EUS. 167 



Comparing with B. proteus, Orbigny remarks that the character 

 most sharply separating the two species is that B. cora in youth is 

 strongly carinated, as far as the third whorl, while in B. proteus the 

 whorls are rounded. Hidalgo states that three examples taken at 

 Huanuco by Paz have the color-lines interrupted, giving them some 

 resemblance to B. tessellatus Shuttl. 



Shuttleworth and Pfeiffer at one time described JV. tessellatus 

 under the name cora; and Dohrn goes so far as to unite eora,tessel- 

 latus, atalmalpa and papillatus; but at least the last of these is 

 clearly distinct. 



The somewhat more slender form of cora, especially its basally 

 produced aperture, seem to be the main distinctions between it and 

 tessellatus. The expansion of the outer lip is only slight. Not hav- 

 ing specimens, I give above both Orbigny's and Pfeiffer's descrip- 

 tions of the typical form. 



Var. unicolor Pfr. PI. 30, figs. 3, 4. 



Unicolored whitish, the aperture edged within with violaceous; 

 peristome more broadly reflexed. 



Between Patas and the Maranhon, Peru (Raimondi). 



B. cora Orb., PFR., Novit. Conch., iii, pi. 95, f. 9, 10, but not the 

 description on pp. 418, 419. B. cora var. PFR., Monogr., vi, p. 49. 

 B. cora var. unicolor PFR., Nomencl. Hel. Viv., p. 245. 



N. TESSELLATUS (Shuttleworth). PI. 31, figs. 21, 22, 23. 



Shell rimate-umbilicate, ovate-conic, solid, rather smooth, opaque ; 

 dull corneous, ornamented with square chestnut spots arranged in 

 several bands. Spire rather acute, the apex papillar. Whorls 7, 

 the upper flat, lower a little convex, the last whorl large, nearly 

 equal to the spire, somewhat inflated, produced anteriorly, ascend- 

 ing at the aperture, the base compressed around the umbilicus. 



Aperture built forward, suboval, of a deep brown color inside ; 

 peristome acute, somewhat thickened within, the upper margin arc- 

 uate, scarcely expanded, basal margin a little reflexed, columellar 

 margin straightened, very broad, spreading. Alt. 37, diam. 22 

 mill. ; aperture 20 mill, long, 13 wide. (Shuttl.'). 



Peru (Tschudi) ; San Mateo de .ffwaras(Almagro) ; between Mac- 

 anya and the Maranhon (Raimondi). 



" Bulimus cora Orb. (syn. B. tessellatus Shuttl. in litt.) " SHUTTLE- 

 WORTH, Mittheil. naturforsch. Gesell. in Bern, 1852, p. 200. Bui- 



