VITRINELLA-TEIXOSTOMA. 103 



of the others might be identified in the type collections of these 

 authors, but tlie labor and expense attending such an investigation 

 Avould scarcely be repaid by the result. The paucity of material 

 and minuteness of the species must prevent satisfactory conclusions, 

 most of the descriptions being based upon dead specimens, unique 

 or few in number. 



V. Panamensis, V. coNcmNA, V. Janus, V. modesta, V, semi- 

 NUDA, V. TRicAKiNATA, C. B. Adams. Panama. 



V. ExiGUA, C. B. Ad. (V. TEiGONATA, Cpr. a synonym). 



Fanama-Mazatla7i. 

 V. HYALINA, V. INTERRUPTA, V. TiNCTA, C. B. Ad. Jamaica. 



V. MEGA8TOMA, C. B. Ad. (?= Ethalia). Jamaica. 



V. REGULARIS, V. VALVATOIDES, V. MINUTA, C. B. Ad. (?=Ethalia). 



Panama. 



V. MONILIFERA, V. LIRULATA, Y. BIFILATA, V. BIFRONTIA, V. 

 CORONATA, V. ANNULATA, V. CINCTA, V. CARINULATA, V. NATI- 

 COIDES, V. PLANOSPERATA, V. ORBIS, Y. TENUISCULPTA, Y. SPI- 



RULoiDES, Y. ORNATA, Carpenter. Mazatlan. 



Y. PERPARVA, C. B. Ad. and var. nodosa. Carp. 



Panama— Mazathm. 



Genus TEINOSTOMA, H. and A. Adams, 1853. 

 T. POLITUM, A. Ad. PI. 34, figs. 46, 47. 



!Much depressed, flattened above, polished, white, periphery sub- 

 angulated, peristome thickened above and below. Diam. 7"5 mill. 



Philippines. 

 T. Carpentert, a. Ad. PI. 35, figs.- 52, 53. 



Much depressed; spire nearly covered by a callous deposit, only 

 exposing the apex, last whorl flattened, periphery faintly angulated, 

 umbilical callus rounded. Diam. 2"75 mill. 



Gulf of Pechili. 

 T. coNCENTRicuM, A. Ad. PI. 35, figs. 54, 55. 



Depressed convex, finely spirally striate, white, body whorl round- 

 ed at the periphery, aperture transversely ovate. 



Diam. 2'75 mill. Takano-Sima, Japan. 



T. RADiATUM, A. Ad. PL 35, figs. 56, 57. 



Depressed orbicular, convex above, somewhat flattened on the 

 base, periphery rounded, ridged by strong growth-lines, peristome 

 callously projecting above, basal callus somewhat excavated. 



Diam. 3 mill. Kino-0-Sima, Japan. 



