THE NAUTILUS. 15 



Genus LEPYRIUM Dall. 



Shell neritiniform, small, thin, unicolorate; with a broad smooth- 

 edged pillar lip; the operculum shaped like that of Neritina but 

 without any calcareous layer or projecting processes ; the dentition 

 comprising a very wide rhachidian tooth with a short finely denti- 

 culate cusp, the median denticle hardly larger than the others and 

 on each side of it a small obliquely set lateral, a broad major lateral 

 with finely denticulate short cusp, and a short series of spatulate 

 uncini much longer than the median teeth. Formula x. 2. 1.2.x. 



Type Lepyriwn Showalteri (Lea, as Neritina), from rivers of the 

 Appalachian drainage in Northeastern Alabama. Types, numbers 

 29,016 and 102,851, U. S. Nat. Museum. 



The specimen from which the radula was obtained was very small 

 and the radula so minute, and its long uncini so tangled, that it was 

 impossible to make a complete description or enumeration of them. 

 The rhipidoglossate character, however, was evident, and the form 

 of the cusps of the middle part of the radula could be clearly seen. 

 They differ from those of Neritina by having a very wide and short, 

 finely denticulate rhachidian tooth, instead of a small quadrate one 

 with simple edges ; one instead of two oblique minor laterals ; in 

 the broad and simple quadrate form of the major lateral, and the 

 relatively smaller number and larger size of the uncini. Anculosa 

 has a tsenioglossate radula with the formula 3.1.3, so it is evident 

 that this form is not in any way related to Anculosa. 



The Oligocene of the Southern United States contains several 

 species of Neritina, but none, so far as known, having a close resem- 

 blance to Lepi/rium ; which is, however, probably an offshoot from 

 Xf ,-itina. The fluviatile fauna of the Coosa region contains several 

 unique or isolated types of mollusks and the present species adds 

 another to the list. 



THE GOOSE FAIR BROOK. 



BY REV. HENRY W. WINKLEY. 



A curious brook, with an odd name, the origin of which I do not 

 know. For some years this stream has formed the boundary be- 

 tween the city of Saco and the town of Old Orchard. The portion 

 of it known to the writer is the last five or six miles of its course. 



