176 AMERICAN JOURNAL 



It will be noticed, tliat, in several of the genera, the increase 

 of known species within 13 years, has been very slow, while 

 in others it has been exceedingly rapid. Adamsiella, Cistula^ 

 Oeomelania, Oiopoma, Pterocyclos, and Tudora are examples 

 of the first ; while, among the examples of rapid progression, 

 Stoastoma is very remarkable, the increase being due to the 

 energy of Hon. E. Chitty, a resident in Jamaica. In the pre- 

 sent monograph. Dr. Pfeiffer has adopted a large number of 

 the new genera proposed for East Indian species by the 

 Messrs. Adams, Blanford and Benson, and most of the species 

 described in the various scientific journals during the year 

 1864 are included. 



Ueber die Familie der Rissoiden. by gustav schwaktz von mohr- 

 ENsTERN. (Denkschrifteu der Kaiserlich Akad. der Wissenchaften, 

 XIX.) 



L Bissoina, 120 pp., 4to, 11 colored litho. plates. Wien, 1860. 

 XL Blssoa, 58 pp., 4to, 4 " " " " 1863. 



This beautiful work deserves a longer notice than our space 

 will at present admit of. The work commences with a long 

 review of the literature of the family, containing synopses of 

 the various classifications that have been proposed, with other 

 interesting particulars. The literature quoted is very extensive, 

 embracing over 150 volumes and papers; next we have descrip- 

 tions of the principal collections of Rissoidae in Europe, which 

 have been consulted by the author. 



Then follow papers on anatomical details, and on geograph- 

 ical and geological distribution. 



After the foregoing introductory pages, the genus Rissoina 

 is fully described, with numerous interesting facts appended, 

 and an analytical table of fossil and recent species. The text 

 of Part I. is concluded by very complete descriptions of 91 

 species. 



Part II. contains a like description of the genus Rissoa, and 

 its species, 47 in number. 



The plates, representing the species greatly magnified, are 

 beautifully drawn and colored, and contain over 300 figures. 

 The work may be obtained from Karl Gerold's Sohn, booksel- 

 ler, Vienna. 



Novitates Conchologicae. by dr. louis pfeiffer. Part 22, 4to Cas- 

 sel. (no date). 



Cylindrella Coronadoi, Arango. Cuba. 



" Blainiana, Gundl. " 



Trochatella regina, Morelet. " 



Helicina emocla, Pfr. " 



Trochatella Mouhoti, Pfr. Cambodia. 



