188 Jaw and Lingual Dentition of Pulmonata. 



Lingual membrane (pi. xiv, fig. E) as usual in the genus. Centrals 

 with the base of attachment very much larger than that of the laterals, 

 and with an enormous, single, broad, long, rapidly and obtusely pointed 

 cutting point. No side cusps or side cutting points. Laterals of the form 

 usual in the HeUcince, with a stout, inner cusp, bearing a broadly truncated, 

 short cutting point, and a small side cusp bearing a short cutting point. 



The change from laterals to marginals is shown in the 10th, loth and 

 27th teeth in the plate. 



The marginals (28th and 68th teeth in the plate) have a long, narrow 

 base of attachment, which near its lower margin bears a .short, slightly 

 expanding, bluntly tritid cusp: from this cusp springs a short, expanding, 

 bluntly denticulated, broad, cutting edge, the inner denticle the largest. 

 This cutting edge is shown in the G7th and G8th teeth on a mure enlarged 

 scale. There is great variation in the denticulation of the cutting edge. 



There are G8 - 1 - 68 teeth. 



The peculiarity of this membrane is the enormous development of the 

 central tooth. 



I have (1. c.) given figures of the dentition of A. patula, 

 Brug., of St. Kitts and of Dominica, of A. appendiculata, 

 Pfr. of Guadeloupe, and of A. rubescens, Fer. of Martin- 

 ique.* Dr. Fischer (Journ. de Conch. XXII, 1874, pi. v), 

 figures that of A. depressa of Guadeloupe, and A. patula of 

 Guadeloupe. - 



Dr. Fischer also (1. c.) figures the dentition of A. rubes- 

 cens. He gives inner side cutting points to the lateral teeth 

 which I did not find in my specimens. His figure of the 

 dentition of the Guadeloupe A. patula is certainly specifi- 

 cally distinct from the St. Kitts and Dominica form. It 

 seems as if there were the following distinct species of 

 Amjil lib id una : depressa, appendiculata, rubescens, patula of 

 Guadeloupe, patula of St. Kitts and Dominica and Raivsonis. 



It is with extreme regret that I find the Amjihibulimai still 

 treated as species of tiuccinea by Dr. Pfeiffer in vol. VII of 

 his Monographia, even as late as the present year. Messrs. 

 Fischer and Crosse, as well as Mr. Bland and myself, have 



* My friend Mr. Bland and myself were indebted to Gov. Rawsou of Barbados, lor 

 specimens of this last, as well as for many other valuable West Indian species. The 

 6ense of our great obligation to him is increased at this moment by hearing that he 

 has left Barbados to settle permanently in England. 



