Helix Jamaicensis, etc. 151 



sus, Shuttl., Cyclostomus Aminensis, Pfr., Chondropoma 

 serraticosfa, Wein., Helicina rugosa, Pfr., and Paivana, Pfr., 

 Helix, pubescens? Pfr., crispata and indixtincta, Fer., cepa, 

 Mull., Cylindrella gracilicollis, Fer., and Macroceramus 

 Klatteanus, Bland. 



Species not yet determined, among them an Oleacina, 

 believed to be new, will be described on another occasion. 



Helix Ingersollii, now sp. (Microphysa). 



T. umbilicata. discoidea, tenuis, translucida, sublevis, alba; spira plana, 

 vertice, subimmersa; sutura impressa; anfr. 5£ convexiusculi, lente ac- 

 rescentes, nltimus non descendeus, infra peripheriam convexior; umbili- 

 cus fere 1 mill, latus; apertura subverticalis, altior quam lata, lunaris; 

 perist. simplex, acutuin, marginibus remotis, columellari brevissime pa- 

 tente, basali subsinuato. 



Shell umbiiicatcd, discoidal, thin, translucid, nearly smooth, white; 

 spire flat, summit subimmersed; suture impressed; whorls 5k rather con- 

 vex, slowly increasing, the last not descending, more convex below the 

 periphery; breadth of umbilicus nearly 1 mill.; aperture subvertical, 

 higher than broad, Innate; perist. simple, acute, margins remote, columel- 

 la!' margin slightly reflexed, basal margin subsinuate. 



Diam. maj. 4 ; min. 3|; alt. 2£ mill. 



Station and Habitat. Howardsville, Baker's Park, 9300 

 ft. above the sea, abundant in wet places on the mountains; 

 not uncommon at Cunningham Gulch, near the former local- 

 ity, clinging to the almost vertical face of a trachyte cliff, at 

 an elevation of about 11,000 feet; the finest specimens came 

 from this spot ; found also on the southern slope of the Sa- 

 guache Mountains, in the Las Animas and La Plata valleys, 

 in the same stations as affected bv Succinea. 



