Notes on certain Terrestrial Mollusks. 6 



T directed the attention of Poey to the formation of C. elatior, 

 and he sent me a specimen marked C. Oviedotana, and opened 

 so as to exhibit the extraordinarily developed lamella shown in 

 PI. V. fig. 18. I have since detected the same in two other 

 specimens; in one it is on the outer side of the axis in the 

 second whorl, and in the other, it extends from the third to the 

 second whorl, counting upwards from the base. 



On sabsequerit more careful examination, Poey found the 

 axis of C. Oviedoiana as I have above stated, and that the shell 

 fbrw arded to me, of which he had other specimens, is of a 

 different species, — the large lamella figured being constant, as 

 well as other characters sufficiently distinguishing it. He 

 lias described it as C. strangulata. 



Observations on the internal structure of shells are not 

 devoid of scientific value, aiding in the determination of the 

 genus, as in the case of Proserjiina opalina^ and of the spe/iies 

 in that of Cylindrella stran-aulata. 



IV. — COKRECTIONS AND AdDITEONAL FaCTS, ESPECIALLY AS 



TO THE Habitat of Sundry Species. 



Helix Cassiquiensis Newcomb, M. S. 



Pfeiffer and Reeve erroneously attribute this species to 

 Cuba. Dr. Newcomb assures me that he collected it near 

 the Cassiquia Creek, in Demerara, from whence its specific 

 name. 



Helix cognata Per. 



No habitat is assigned by authors to this species. It is 

 from Jamaica, and I am indebted to .the Hon. E. Chitty for 

 several fine specimens. 



Helix conspersula. Per. 



This is also a Jamaica species, from whence I have received 

 it, — it is by no means abundant. 



