Dentition of Pulmonale Mollusks. 81 



AGNATHA. 



Chlamydcpliorus. 



Chlamydephorus Gibbonsi, W. G. Binney. Natal Colony, 

 Africa, Mr. J. S. Gibbons. 



The lingual membrane is long and broad, consisting of about 52 chevron- 

 shaped rows of 27-1-27 teeth, all as in Qlandina, the central one differing 

 only in being smaller than the adjacent marginals, and symmetrical, with a 

 long, slender cutting point ; there are no laterals, all the side teeth being 

 purely aculeate marginals, and first rapidly increasing and then gradually 

 decreasing in size as they pass off laterally, as is usual in Glandina. Buccal 

 mass very large indeed. (PI. XVII, fig. A. ) 



The plate shows the central and three adjacent marginal 

 teeth, the eighth marginal, aud the twenty-third to the twenty- 

 seventh, which is the last. 



Glandina. 



For the description of the dentition of the genus, see Terr. 

 Moll. IT. S., V. All the species examined by me agree with it. 

 There are no lateral teeth. 



Glandina semitarum, Bang. (Varicella), Martinique. Gov. 

 Rawson. 



There are about 30-1-30 teeth. The central is long, narrow, and sharply 

 pointed. (Plate XVII, fig. C.) 



Glandina Phillip si, Ad. (Varicella.) Jamaica. 



As in the last species; PI. XVII, fig. D, shows an outer mar- 

 ginal. There is a peculiar notch in the upper edge of the base 

 of attachment. 



Glandina rosea, Fer. Nicaragua. Mr. McNiel. 



Membrane with 36 rows of 25-1-25 teeth. Centrals long, narrow, slightly 

 incurved at sides, emarginate at top, rounded at base, and bearing a short, 

 blunt, stout, cutting point. (PI. XVII, fig, B.) 



Glandina aurata, Mor. Costa Eica, Dr. W. M. Gabb. 



Referred to as an undetermined species in Ann. N". Y. Ac. Sci. 

 I, 2G1. 



Teeth, 36-1-36. The central tooth has a long slender cutting point. 

 (PI. XVII, fig- E.) The central tooth and first four marginals. 



