162 Notes on certain Terrestrial Mollusca. 



The genus Macroceramns belongs to the West Indian fanna, 

 and has its greatest development in Cuba and Haiti. 



Pfeiffer remarks that Macroceramns has affinities with Buli- 

 mus, Pupa, and Cylindrella, but especially with the latter ; it 

 is, however, noticeable that the buccal plate is not found in the 

 animal of that genus, while it exists in Macroceramns. 



Mr. Robert Swift lately sent to me (mounted for microscopic 

 examination), the buccal plate and lingual membrane of Macro- 

 ceramus signatus Guild, of Tortola, and of the lingual mem- 

 brane of the same species from Anguilla, from which I annex 

 figures drawn by Morse. 



Fig. 5. Fig. 6. 



Buccal Plate of M. signatus Lingual Dentition of Macroceramns 



Guild., Tortola. signatus Guild- 



Fig. 5. a. Natural size. 



h. c. Taken from different specimens, and showing some 

 variation. 

 d. The central portion of c highly magnified. Mr. 

 Swift remarks that the plate is flexible and much 

 like, but distinct from, that of Bulimus elongatus 

 Bolt. 



Fig. 6. a. Central plate and laterals of M. signatus Guild, 

 from Tortola ; about 100 rows, 27-1-27. 



h. Section of lingual membrane. 



c. Central plate and laterals of same species from An- 

 guilla. 



