Dentition of Pulmonale Mollushs. 85 



Nanina leucostyla, Pfr. 

 Nanina rufozonata, H. Ad. 



From Mauritius, prove also to belong to Nanina. 



Nanina radians, Pfr. (Microcystis). K-aro tonga Island. 

 Mr. A. Garrett. 



Plate XVII, tig. P, represents one central, lateral and marginal tooth. 

 There are 40-1-40 teeth, eight on each side being perfectly formed laterals. 

 The marginals are sometimes trifid. 



Nanina conula, Pease. Island of Hualiine. Mr. A. Garrett. 



Central and lateral teeth as in N. radians, Pfr. (See above.) Lateral 

 teeth, seven in number on each side. Marginals aculeate, rnultifid, very 

 numerous. 



Nanina calculosa, Gould. Island of Hualiine. Mr. A. 

 Garrett. 



Jaw as usual in the genus. Lingual membrane long and narrow. Teeth, 

 38-1-38. Centrals and (7) laterals as in N. radians. (See above.) The lat- 

 ter, however, have slightly developed inner side cutting points. First 15 

 marginals bifid, the rest multifid. 



Nanina Cressida, Gould. Island of Hualiine. Mr. A. 

 Garrett. 



Jaw arched, high; ends blunt; cutting-margin with a median beak-like 

 projection. 



Lingual membrane (PI. XVII, fig. Q) with 55-1-55 teeth. The bifurcation 

 of the cutting-point of the marginals commences in the 11th tooth. There 

 are no side cusps to the centrals and laterals, which have a long, narrow 

 base of attachment on each side. I figure one central, one lateral and one 

 marginal tooth. 



Nanina Chamoissi, Pfr. West Maui, Sandwich Islands. 

 Gulick. 



PI. XVII, fig. O. The marginal teeth have three or four points. An un- 

 identified species from Oahu has similar dentition. 



Nanina sitbcircula, Mousson. Raiatea, Society Islands. Mr. 

 Garrett. 



Lingual membrane (PL II, fig. A) as in the other species. 

 Nanina cultrata, Gould. 



Lingual membrane as usual in the genus. Laterals six on both sides; 

 extreme marginals multifid. 



Nanina Calias, Benson. Foot of Himalayas. Mus. Comp. 

 Zool. 



