OF CONCHOLOGY. 331 



exceedingly unlikely that these species have been introduced by 

 man, and flourished since, for years, the author suggests their 

 migration by means of a supposed tertiary continent of Atlantis. 

 (Questionable.) 



Concliological Gleanings. By Dr. E. VoN Martens. 



V. On the different ages of Trochus neloticus L., and Tr. 

 maximus, Koch. 



VI. On the species of Argonauta. 



Proceedings of the Zoological Society of London. 1866. Part II. 



Descinptions of fifteen new Species of Land and Fresh-water 

 jShells from Formosa, collected by Robert Swinhoe. By 

 Henry Adams. 

 Nanina [Acusta) assi)nilis, Ennea {Elma) Swinhoei, 



Helix [Plectotropis) fidoieans, Oyclotus Swinhoei, 

 " [Camcena) Bairdi, " minutus, 



" " succincta, Alycceus {Dioryx) Swinhoei, 



Bulimus [Amphidromus) For- Papinella [Pupinopsis] Swin- 



mosensis, hoei, 



Clausilia [Laciniaria) exilis, Limnoia Swinhoei, 

 " (Phcedusa) Formosen- Segmottina Sivinhoei, 

 sis, Unio Swinhoei. 



Characters of Six New Australian Land Shells. By James 

 C. Cox, M. D. 



Helix Porteri, Helix corticicola, 



" conscendens, Helicina diversicolor, 



" fenestrata, Pupina pinetieola. 



List of Shells collected by Samuel White Baker, Esq., durijig 

 his recent Explorations in Central Africa. By Henry 

 Adams. 



Unio Bakeri, H. Ad. Lake Albert N'yanza. 



" acuniinatus, H. Ad. " " 



Part III. 



List of Land and Fresh-water Shells collected by Mr. E. 

 Bartlett on the Upper Amazons, and on the River Ucayali, 

 Eastern Peru, with descriptions of 7iew Species. By 

 Henry Adams. 

 Rumina {Obeliscus) pusilla, Aperostoma connivens, 

 Clausilia [Nenia) Bartlettii, Bartlettia, nov. gen. (Family 

 Otostomus pulcherrimus, ^Etheriidce). 



" Bartlettii, Bartlettia Stephanensis, Mori- 



" scitus, cand. 



