THE PACIFIC COAST. 29 



10 whorls, of which 4 only are not deciduous ; these are 

 convex, increasing in size rather rapidly ; aperture oval, 

 vertical, rounded above ; peristome simple and continu- 

 ous, slightly expanded, its pillar margin scarcely attached 

 to the shell. 



Length 4f, diam. 1| mill. 



Geographical Distribution. San Diego, California. 



Remarks. This is the only Truncatella yet found on 

 the western coast, excepting, perhaps, the doubtful species 

 from Mazatlan mentioned in the Riegen Catalogue, 

 p. 364. 



It is readily distinguished by its amber or deep honey 

 color, and its shining surface nearly unbroken by ribs. 

 The bars are numerous, and are distinguished rather by 

 making the shell more opaque than by their prominence. 



I am indebted to Mr. Cuming for the figure I have 

 given of a specimen in his collection, and to Dr. Gould 

 for specimens of the shell. 



This is the Truncatella gracilenta mentioned in the 

 Errata of Vol. X. Phila. Proc. That name was proposed 

 by Gould before meeting with Pfeiffer's description. 



2. The Species East of the Rocky Mountains. 

 FAMILY LIMACEA. 



Genus VAGINULUS Ferussac. 



VAGINULUS FLORIDIANUS Binney vol. ii. p. 17, pi. Ixvii. 



SPURIOUS SPECIES. 



The following species are catalogued by Grateloup among the 

 American Vaginuli, (Dist. Geog. des Limaciens, p. 22). They 

 were all described by Rafinesque, and by him placed in his genus 

 Philomycus. From the general inaccuracy of that author, as well 



