ADDENDA, Etc. 



Liniuaea stagnaiis. (See p. 28.) 



Fig. 25t representS"the lingual dentition of a specimen lately 

 Fig. 257. 



Lingual deutition of LimncBa stagnalis. 



received from the Lake of Geneva. There are 100 rows of 

 41 . 1 . 41 teeth each. 



ItilliitllS Ibei'Iandierianvis. — Shell cylindrical, smooth, whiten- 

 ed, rather thick ; whirls five, the upper ones narrowly flattened, the lower 

 one comprising more than fifteen-seventeenths of the whole 

 length of the shell ; quite compressed ; aperture very long, pjg, 258. 

 narrow ; columella simple, with a light callus. Length 17, 

 greatest breadth 8 ; of aperture, length 14, breadth 4 milli- 

 metres. 



Bulinus herlandierianus, W. G. Binney, Am. Journ. of Conch. 

 I, 51, pi. vii, f, 8. 



Texas, in the region of Matamoras. 



Six specimens were presented to the Smithsonian 

 Institution by Gen. Couch, among the shells collected 

 by Berlandiere. 



This species resembles Bulinus elatus, Gld., more 

 than any other known to inhabit North America. But 

 that species is very much thinner and delicate, has a 

 longer, more pointed spire, a shorter aperture and 

 more convex body whirl. 



Fig. 259 is drawn from the largest American speci- 

 men of the widely distributed Bulinus hinmorum. It 



Bit iuus 



shows how slight is the resemblance to that species in hypnorum. 

 B. herlandierianus. 



( 155 ) 



