112 TIiE NAUTILUS. 



umbilical region somewhat calloused, (lit- place of the umbilicus 

 marked by a moderately sunken pit, surrounded by a weak spiral 

 rib which terminates in a faint denticle at I he junction of the eolu- 

 mellar and hai-al margins of the peri>lonie. Alt. 14, diam. 10^ mm. 



Beagle Channel, Patagonia (Dr. II. von Ihering). 



This species (No. 1020 of von Ihcring's register) is obviously 

 unlike the forms of eastern Patagonia, and there is nothing like it in 

 Mabille and Rochebrune's work on Cape Horn mollnsks. Of the 

 Chilian species, it is allied only to O. fuscrscens Phil.,* but in C. 

 Orbignyanum the whorls are more convex, the prevailing color black, 

 and it is imperforate. 



ON A COLLECTION OF FRESH-WATER SHELLS FROM RHODE ISLAND. 



BY FRANK C. 13AKKR. 



During the month of July, 1809, the writer made a collection of 

 marine and fresh-water shells in the state of Rhode Island, and a list 

 of the fresh-water species may be of interest. Collections were made 

 at the following places : 



1. Nayatt, R. I. A small pond between the railroad depot and 

 the bay. The bottom is made up of soft, black, carbonaceous mud, 

 and the shores are lined with dead leaves and twigs. 



2. Newport, R. I. Bailey's Pond, near Bailey's Beach. A pond 

 of good size and considerable depth, bordered by cat-tails. 



3. Providence, R. I. Cat Swamp. A small clear stream, flowing 

 through a flag-swamp. The numbers after the species indicate the 

 above localities. 



Calyciilina partumeia Say. 1, 2. Common. 



Calyculina truncata Linsley. 1. Common. 



Calyculina securis Prime. 2. Not common. 



Pisidium, near abditum, but possibly P. Ims Sterki. 1. Common. 



Pisidium splendidulum Slerki. 1,2. Not common. 



Limncea p'thistris Mu'ller. 3. Common. 



Phmorlris trivolvis Say. 2, 3. Common. 



Planorbis deflectus Say. 1. Common. 



Planorbis parvus Say. 1, 2, 3. Common. 



*Conchylien Cabinet, Trochus, p. 182 ; Man. of Conch., XI., Trochidte, p. 181. 



