164 AMERICAN JOURXAL 



The marginal teeth are a simple modification of the laterals, 

 being reduced to a subquadrate shape, with the point of the 

 cusp much more produced. 



The figure (pi. 12, fig. 7) we have given, represents a group 

 of centrals and laterals from the lingual membrane of a very 

 long and slender Brazilian species. As already stated, the 

 lingual membranes of all four of the species before us are so 

 nearly alike that this figure would apply to all. It will be 

 found much more satisfactory than those already published by 

 us. (L. and Fr. w. Shells, Part I, p. 306, fig. 543, and Ann. N. 

 Y. Lye, IX, p. 385, fig. 5.) 



The jaw of V. Floriclana has already been figured by us (L. 

 and Fr. w. Shells I, p. 305, fig. 542). It is long, low, slightly 

 arcuate, with blunt ends ; anterior surface with twenty-four 



ribs, crenellating either margin. The Brazilian V. has 



about thirty ribs ; V. has about twenty broad ribs. The 



Jamaica species, which appears to be Veronicella Sloanei, has 

 twenty broad ribs. 



Explanation to Plate 12. 



Fig. 1. A group of centrals and laterals of Limncea appressa. 



2. A still more magnified view of one central with the 



adjacent laterals of Limncea appressa. 



3. A marginal of Limncea megasoma. 



4. A group' of centrals and laterals from another por- 



tion of the same membrane as fig. 1. 



5. A group of laterals and marginals of Limncea ap- 



pressa. 



6. A lateral of Limncea megasoma. 



7. A group of centrals and laterals of a Brazilian Vero- 



nicella. 



