82 THE NAUTILUS. 



tically a monograph of the group, although there are numerous 

 omissions. B. ampulla is split into several species formerly (and 

 justly) regarded as varieties. B. vernicosa Gould is described as 

 new under the name "B. secunda." B. adamsi Mke., which has 

 already had several synonyms, figures as "B. subaitstralis sp. nov." 

 B. ditbiosa, habitat unknown, and B. delorti, Japan, are also de- 

 scribed as new. The first is certainly well named. In all 23 spe- 

 cies are mentioned, this number including several not entitled to 

 that rank. In the monograph published in Manual of Conchology, 

 1894, there are 32, not counting " bad " species. 



In his "Contributions a la Connaissance des Mollusques Terrestres 

 el d'Eau Douce de Kameroun" 1 Mr. Adolf d'Ailly has made a sub- 

 stantial addition to the rather meagre literature of west African 

 land shells. The shells described were collected by three Swedish 

 naturalists, Mr. P. Duzen and Drs. Y. Sjostedt and J. R. Jungner 

 The Cameroon fauna is rich in species of Ennea, 17 being enumer- 

 ated, 8 of them new. The Zonitoid genera Helicarion, Zonitarion, 

 Thapsia and Trochozonites are represented by numerous species 

 with many new forms. In the Achatinidce a new genus, Ganomi- 

 dos, is proposed for Achatina Shidtleicorthi Pfr. and A. Barriana 

 Sowb. The genus Petitia Jousseaume (of tautologic fame) is recog- 

 nized for Achatina pulchel'a Martens, of which Petitia Petitia Jouss. 

 and Ach. Smithi Sowb. are reckoned synonyms. Pseudachatina, 

 Perideris and Limicolaria are well represented. M. d'Ailly has in- 

 dependently arrived at the conclusion that the sculpture of the em- 

 bryonic shell is frequently a character of high value in the Pulmon- 

 ate snails. Five well-drawn lithographic plates illustrate the new 

 species described. 



VALLONIA PARVULA AND PUPA HOLZINGERI. In the October 

 NAUTILUS just received to-day I notice that Vallonia parvula 

 Sterki, is not given as occurring east of Illinois. In the summer 

 of 1891 I discovered this species on Put-in Bay Island, Lake Erie. 

 The specimens were submitted to Dr. Sterki, and determined by 

 him. Associated with it was Pupa Holzingeri Sterki, which is also 

 a Mississippi Valley form. The occurrence of these two species so 

 far east may be of interest to you. BRYANT WALKER. 



1 In Bihang till K. Svenska Vet.-Akad. Handl. Bd. 22. 



