Mascarene Land-Mollusca. 423 



Then follows a very important notice which I will quote in 

 full : — " Entirely different in the dentition is another species, 

 N. philyrina, Morelet, though the species agrees in other 

 respects with the above-named. The membrane is -very 

 broad, the teeth exceedingly numerous, arranged in oblique 

 rows. The centrals, which I am confident of having seen, 

 are small, narrow, high. The other teeth are the same in 

 form to the edge of the membrane. They appear to have 

 the usual aculeate form of the marginal teeth in Nanina, 

 but instead of narrowing towards the cutting-point, they 

 are broadly and obliquely truncated, reflected, and minutely 

 denticulated. This lingual ribbon is also figured by Semper 

 (Phil. Archip. pi. vi. f. 35), but his figures give more the 

 impression of the usual Nanina marginals with denticulated 

 sides and bifid points. The teeth are, however, so exceedingly 

 numerous and small, it is very difficult to understand them." 

 This species is made the type of Caldwellia by H. Adams 

 {vide P. Z. S. 1873, p. 209), and cernica, H. Adams, with 

 imperfecta, Desh., probably belong to it, both Mauritian. 



In this description we have distinct evidence of the sub- 

 family Burgellinse of India and Malayana extending to the 

 Mauritius ; the finely decussated and keeled shell philyrina 

 is very unlike any species of the Indian genera of the sub- 

 family, and will probably have to be put in a new genus. 

 " Elsewhere (Ann. N.Y. Lye. N. H. x. 170) we have 

 described the lingual of the following Mauritius species : — 

 Nanina inversicolor, leucostyla, rufizonata, militaris. We have 

 examined two genitalia of N. inversicolor. The oviduct is 

 long, narrow, sac-like ; the genital bladder is hardly smaller 

 than its long wide duct ; the penis is long, extended into a 

 flagellwn, receiving the vas deferens near its apex, beyond it 

 having a bulb-like termination ; the vas deferens is greatly 

 swollen in its middle portion, and near the base of the ovi- 

 duct has a long flagellate appendix." 



Still quoting Messrs. Bland and Binney concerning the 

 species inversicolor, leucostyla, and rufozonata which they 

 had received from Mr. Pike, the United States Consul at the 

 Mauritius, it is stated that inversicolor and militaris were 

 placed by Von Martens in Helicacea, genus Helix, the 

 former in the section Caracohis, type of which is H. caracolla 

 from Porto Rica, and the latter in Stylodon, type unidentata 

 of the Seychelles ; " but both, as well as rufozonata and 

 leucostyla, beloug to the Vitrinea, genus Nanina, of Von 

 Martens' classification. Indeed our figure of lingual denti, 

 tion of N. calias, Benson (' American Journal of Conchology/ 

 vol. vii. p. 188, pi. xvii. fig. 6), well applies." 



