MoUasca from Pern and Argentina. 525 



aperture roughly subtriangular ; opeiculuni liarp-shaped, 

 concave, horny, laminiferous, granular, very dark chestnut 

 shading to a paler hue towards the laterally placed nucleus. 



Alt. 4'5, diam. maj. 7*5, diam. min. 6 mm. 



Aperture : alt. .3, diam. 3'25 mm. 



Hah. Rio Pucaya, Eastern Peru. 



Ilelicina contamanoen.iis, sp. n. 



Shell broadly conoid, polished, shining, dark yellowish 

 flesh-colour ; whorls 5, not very convex, regularly increasing, 

 the last acutely carinate, gradually descending in front, 

 marked with arcuate growth-lines and sculptured with very 

 line, confused, oblique strips and distant spiral ridges ; suture 

 lightly impressed, narrowly, callously margined below; 

 columella white, descending obliquely, and developed into an 

 outwardly directed, nodular projection at the base, outwardly, 

 callously diffused above into a thin, well-defined, granular, 

 parietal callus ; labrum white, narrowly expanded and re- 

 flexed especially below, coarsely granular, receding towards 

 the base, outwardly extended above ; aperture broadly 

 sagittiform ; operculum corneous, slightly concave, some- 

 what granular, laminiferous, with lateral nucleus, reddish- 

 chestnut shading to dark yellow towards the nucleus. 



Alt. 9, diam. maj. 15, diam. min. 12*5 mm. 



Aperture : alt. 5, diam. 6'5 mm. 



Bab. Contamano, E-io Ucayali, Eastern Peru. 



Allied to //. rhyncostoma (Shuttl.), P£r. *, but with nar- 

 rower and higher aperture ; moreover, the spire is not 

 laterally concave as in that species. 



Ilelicina inca, sp. n. 



Shell allied to U.contamanoensis, Preston, but differing from 

 that species in its more depressedly conoid form and greenish- 

 yellow colour, and in being painted with a narrow, reddish, 

 subcarinal band j the last whorl does not descend so much in 

 front, and the distant spiral ridges of H. contamano'ensis give 

 place to rather closely-set, impressed, spiral lines, while the 

 base of the shell is sculptured with fine, closely-set, revolving 

 striae ; the columella is more excavated and is quite rounded, 

 lacking the nodular projection at the base ; the aperture is 

 rather less broadly sagittiform and the labrum is rather less 

 outwardly expanded than is the case in that species. 



* Shuttleworth in PfeiiFer, Mon. Pneum. iii. I860, p. 245, 



