G 



LAND AND FRESII-WATER SHELLS OF N. A. [PART IL 



fresh water it becomes benumbed and dies ; it will live without 

 water in captivity several days. 



There can be no doubt of JI. horealis, Conrad, being identical 

 with this species. Conrad's description is given below. 



Melanipus horealis. — Shell ovate-acute, elongated ; pale horn-color, with 

 darker longitudinal bands ; whirls six or seven, with a revolving impressed 

 line below the suture ; spire elevated, conical ; columella with three distant 

 and distinct plaits, the middle one most promiuent ; aperture obovate- 

 acute. Length about one-fourth of an inch. 



This small species of Melampus has been found sparingly on the coast of 

 Rhode Island, by Lieut. Brown, of Newport. It is similar in form to a 

 B}tlimu!i, and is very unlike the common species with which it associates. 

 {Conrad.) 



Fig. 5. 



CARYCHIUM, MiJLLEE. 



Foot not transversely divided beneath. 

 Shell pupa-shaped, very thin, transparent, 

 with but few whirls ; aperture suboval ; with 

 one dentiform columellar fold, sometimes ob- 

 solete ; parietal wall with 1 or 2 teeth ; peri- 

 stome expanded, terminations not approxi- 

 mating, the right hand one with one internal tooth. 



Jaw slightly arched, without 

 ribs or marginal denticulations, 

 hardly striated towards the 

 margin. 



Teeth in slightly bent cross 

 series, central equilateral, nar- 

 row, laterals broad, short, denticulated. 



Carychiimi exiguum. 



Fig. 6. 



Lingual dentition of Caryckium exigzium. 



But very few species of this genus have been described, most 

 of which are from Europe. Animal terrestrial. 



Carycllium exigllllin, Say. — Shell elongated, tapering at both 

 ends, white, translucent, shining ; apex rather obtuse ; whirls five to six, 



