72 THE NAUTILUS. 



The Mollusca of Colorado, Part III. By Junius Henderson 

 (Univ. of Colo. Studies, vol. IX, May, 1912). Contains numerous 

 additional locality records (of which fourteen pertain to species and 

 subspecies not included in former parts of the work), some rectifica- 

 tions, and evidence for the removal of a few species given in former 

 lists. A faunal work is never finished, but the papers by Mr. Hen- 

 derson form a good foundation for further work in Colorado. It is 

 by far the most complete account of any Rocky Mountain mollusk 

 fauna. 



The West American Molltjsks of the genus Eumeta. 



The recent and fossil mollusks of the genus Cerithiopsis from the 

 west coast of America. 



The recent and fossil mollusks of the genus Bittium of the west 

 coast of America. 



New mollusks of the genus Aclis from the North Atlantic. 



The west American mollusks of the genus Amphithalamus. 



The recent and fossil mollusks of the genus Alvania from the 

 west coast of America. 



The west American mollusks of the genus Cingula. 



These papers by Dr. Paul Bartsch published in the Proceedings 

 of the National Museum for 1911-12 are well-illustrated monographs 

 of the west American species of the genera named. All are small or 

 minute shells, the identification of which has hitherto been of great 

 difficulty owing to the brevity of the scattered literature concerning 

 them, and the lack of illustrations. Dr. Bartsch has described the 

 old and new species with a fulness of detail which all who work 

 with these forms hereafter will appreciate — H. A. P. 



Report on Landshells collected in Peru in 1911 by the 

 Yale Expedition under Professor Hiram Bingham. By William 

 Healey Dall (Smithsonian Misc. Coll. vol. 59, No. 14, 1912). 

 Extensions of the known range of a considerable number of species 

 are given, but the chief interest of the paper attaches to the discovery 

 that a group of slender Andean Bulimuli including scalaricosta, 

 infundibulum, umhilicateUus, tubulosus and spiculatus have an internal 

 lamella on the axis, somewhat as in Holospira. The new subgenus 

 Phenacotaxus (type umhilicateUus Pils.) and the section Ataxiellus 

 (type pectinatus Dall) are proposed to receive these forms. The 

 color-variation of Drymceus poecilus Orb. is discussed. — H. A. P. 



