SELENITES. 205 



the base ; whorls 8, obtusely angulated on the periphery, 

 increasing, narrow, subexcavated around the perforation ; aper- 

 ture narrowly lunate. Diam. 5 mill. 



Ins. Palma, Canaries. 

 H. BIFRONS, Lowe. PL 61, figs, 85-87. 



Perforate, thin, costulate-striale above, periphery subangu- 

 lated, smoother below, greenish corneous ; whorls 7-8, slowly 

 increasing, narrow, with distinct suture ; peristome widely white- 

 lipped within. Diam. 12 mill. 



Madeira. 

 H. STEPHANOPIIOKA, Deshayes. PI. 61, figs. 88-90. 



Narrowly umbilicated, somewhat solid, closely costulate 

 above, the periphery crenately subcarinate, base more convex, 

 smoother, yellowish cinnamon-color, suture deep ; whorls 9, 

 narrow ; interior with two or three basal radiating rows of short 

 lamellae, three or four in a row. Diam. 10 mill. 



Madeira. 



H. calathus, Lowe, is a synonym. The internal lamellae are 

 like those of Gastrodonta, but the shell in other respects agrees 

 with the foregoing species of Janulus. 



Genus SELENITES, Fischer, 1879. 



S. VANCOUVERENSIS, Lea. PL 61, figs. 91-93. 



Widely umbilicated, depressed above, more convex below, 

 epidermis rather thick, polished, light greenish yellow, very 

 closely striate by arcuate growth-lines, crossed by microscopic 

 revolving lines ; whorls 5, rather rapidly increasing, the last 

 flattened above at the aperture ; peristome often brown-tinged, 

 its extremities connected by a parietal callus. Diam. 31 mill. 



Alaska to California, Idaho and Montana. 



Much larger than H. concava, although having the same 

 number of whorls, with narrower umbilicus, darker color and 

 coarser sculpture. A dark reddish brown variety is found in 

 Alaska. H. vellicata, Forbes, is a synonym. 



S. SPORTELLA, Gould. PL 61, figs. 94, 95. 



Widely umbilicated, pale yellowish green, shining, regularly 

 sculptured by sharp, close growth-striae, crossed by fine, close 

 revolving lines, causing a granulated appearance when closely 



