194 HELIX-SOLAROPSIS. 



H. selenostoma PER., Proc. Zool. Soc. Lond. 1852, p. 152, 

 Conchyl. Cab., p. 366, t. 139, f. 3-5 ; Monog. Hel. Viv., iii, p. 248. 

 H. sclerostoma REEVE, Conch. Icon., f. 571. Psadara selenostoma 

 MILLER, Mai. Bl., xxv, p. 162. COUSIN, Faune Mai. Rep. Equa- 

 teur, p. 66. 



The surface sculpture is much coarser and less dense than in H. 

 hians, the granules being perfectly obvious to the naked eye. The 

 mouth and umbilicus are both wider than in H. tiloriensis. 



Animal light grayish-brown, granulate, very long, measuring more 

 than three times the diameter of the shell, which is situated pretty 

 nearly centrally. The tentacles are pretty stout, very long, lighter 

 colored than the animal, terminating in a blackish gray bulb. 

 (Cousin. ~) 



H. HIANS Pfeiffer. PL 59, figs. 53, 54. 



Almost covered perforate, depressed, thin, fragile, subtranslucent, 

 horn-color, with a series of angular dark chestnut spots below the 

 suture, and generally several narrow bands and lines encircling the 

 last whorl, closely obliquely streaked with light chestnut ; surface luster- 

 less, very densely, regularly microscopically granulate ; spire flat, 

 whorls 4 to 4^, very convex above, separated by profound sutures, 

 the last one very wide, gently descending in front, rounded, convex ; 

 aperture suboblique, large, rounded-lunar ; peristome thin, very 

 narrowly expanded, the basal margin slightly refiexed, columellar 

 with a short expansion almost covering the narrow perforation. 



Alt. 12, diam. maj. 25, min. 20 mill. 



Marmato, Colombia. 



H. hians PER. in Proc. Zool. Soc. Lond. 1845, p. 130; Monog. 

 Hel. Viv., i, p. 389. REEVE, Conch. Icon., f. 573. 



Distinct from other species in the streaked color-pattern and very 

 narrow, almost closed umbilical perforation. The whorls widen 

 more rapidly than in H. selenostoma or tiloriensis. The shell is very 

 fragile. The specimen before me is from Marmato, labeled by 

 BLAND. 



H. TILORIENSIS Angas. PI. 50, figs. 79-81. 



Narrowly umbilicate, depressed, thin, fragile, pale brown, with a 

 subsutural series of small brown dashes, an interrupted narrow dark 

 band on the upper convexity of the whorls, another narrower one on 

 the periphery, and a continuous one beneath ; the intervening spaces 

 closely marked with narrow oblique or zigzag light chestnut stripes ; 



