OF CONCHOLOGY. 



187 



the jaw of Macroceramus, the overlapping edges of the plates 

 having the appearance of costae, between 

 which are a few fine longitudinal stride. The 

 terminations of the plates produce irregular, 

 ill-defined denticulations at the cutting mar- 



ine annexed figures, for which I am in- 

 debted to Edward S. Morse, represent the 

 jaw and teeth of C. Trinitaria. The for- 

 mula of the lingual dentition is 5 — 2 — 1 — 2 

 — 5 x 110. The figure given by Guppy and 

 Hogg (Trans. Linn. Soc. xxvi, tab. 11, fig. 

 12) is quite unintelligible. 



35. SlMPULOPSIS CORRUGATUS, Gup. Ann- 

 Jaw and lingual denti- and Ma gv Jan., 1866. 

 tion of C. Trinitaria, Pfr. ~ „. 

 a. Side view of lateral. Occurs in the lorest near feavana Grande. 



Guppy. 

 This species is described as being nearest to, but less Succinea- 

 shaped than S. Brasiliemis. The aperture more nearly orbicu- 

 lar, and the ribs larger than in S. rufovirens. 



36. Succinea Margarita, Pfeiffer. 



Trinidad. Gill. Also, (fide Pfeiffer) in Haiti and Bermuda. 

 I sent specimens collected by Gill to Pfeiffer, who determined 

 them to be S. margarita, var. major* 



37.* Succinea Cuvieri, ? Guilding. 



• One specimen collected by Gill was thus labelled by Pfeiffer. 



38. Succinea approximans, Shuttleworth. Diagn., n. Moll., 



No. 6. 



Found on the ground in damp places in most parts of the 

 island. Guppy. 



As to this determination I am not certain. Some specimens 

 received from Guppy, as he admits, are not distinguishable from 

 S. margarita. 



GRENADA. 



1. Cyclotus granadensis, Shuttleworth. 



Grenada. Newcomb, Guppy. 



I received specimens of this from Dr. Wesley Newcomb in 

 1855, and forwarded one to Shuttleworth. It is allied to C. ru- 



