142 PROCEEDINGS OF THE ACADEMY OF [Feb., 



February 5. 

 Mr. Arthur Erwin Brown, Vice-President, in the Chair. 



Thirteen persons present. 



A paper entitled " New Marine Mollusks," by Edward G. 

 Vanatta, was presented for publication. 



Relationships of the Gtniis Neoheliscus. — Dr. H. A. Pilsbry, 

 referring to an account of the anatomy of this genus of South 

 American land snails, ^ stated that in commenting upon the pecu- 

 liarities of the reproductive organs he had overestimated their di- 

 vergence from structures of African Achatinidw, having overlooked 

 a paper by Arruda Furtado, ^ in which the anatomy of Atopocochlis 

 exaratus is described. This genus and species, the speaker con- 

 tinued, is confined to the island San Thome, in the Gulf of Guinea; 

 and resembles Neoheliscus in having the retractor muscle of the 

 penis inserted upon the right ocular band (instead of upon the dia- 

 phragm, as usual in land snails), and as in Neoheliscus the albumen 

 gland is reduced to very small proportions. The separation of 

 the male and female ducts clearly indicates that Atopocochlis is 

 viviparous, like Neoheliscus, although no information is given by 

 Furtado upon this point. The podocyst described in embryos of 

 Neoheliscus is similar to that of Achutitia. These facts indicate 

 that the South Ameiican genus has its nearest existing allies in 

 West African genera, and accordingly modify the general conclu- 

 sions set forth in his former paper. 



February 12. 

 Mr. Arthur Erwin Brown, Vice-President, in the Chair. 



]Sline persons present. 



A paper entitled " New Species of ^Mollusks from South Africa 

 and Burma," by Henry A. Pilsbry, was presented for publication. 



» These Proceedings for 1899, p. 3(56, PI. XV. 

 ^Journal de ConchyUologie, XXXVI, p. 5, PI. II. 



