THE NAUTILUS. 35 



of which it is not necessary here to enumerate. In order, however, 

 to ascertain what material suitable for a purely paleontological pub- 

 lication may be available, we have concluded to offer a prize $50.00 

 for the best American (North, Central or South) paleoutological 

 article presented for publication, as a separate Bulletin, before May 

 1, 1897. The article must be a well written original monograph or 

 report upon some special problem studied in the h'eld or laboratory 

 or both, i. e., not a mere compilation from books. This report may 

 contain from 50 to 200 pages and from 5 to 10 full page plates of 

 the size of our Bulletins. It may be written in any language using 

 Roman characters. The judges named below shall have the power 

 to divide the prize in two equal parts in case of doubt between the 

 merits of two excellent articles, or to withhold the prize in case no 

 suitable articles appear. 



JUDGES: H. S. Williams, Yale University, New Haven, Conn.; 

 T. W. Stanton, U. S. Geol. Surv., Washington, D. C. ; G. D. Harris, 

 Cornell University, Ithaca, N. Y. 



Address all communications to G. D. Harris, Department of 

 Paleontology, Cornell University, Ithaca, N. Y. 



AGRIOLIMAX CAMPESTRIS IN THE PECOS VALLEY, N. M. When 

 recently at Roswell, N. M., I found a few specimens of Ag. eompes- 

 tris. This is only the second locality for the species known in New 

 Mexico, and is the first record of any slug from the drainage-area 

 of the Pecos River. T. D. A. COCKERELL, Mesilln, N. M. 



THE EDITOR acknowledges receipt of living West Coast Helices 

 from Mrs. E. P. Gay lord and Mr. Fred L. Button. They are en- 

 joying life in the vivarium of the Academy of Natural Sciences. 



NOTICES OF PUBLICATIONS RECEIVED. 



A STUDY OF THE UNIONID;E OP ARKANSAS, WITH INCIDENTAL 



REFERENCE TO THEIR DISTRIBUTION IN THE MISSISSIPPI VALLEY. 



By R. Ellsworth Call. (Tr.Acad. Science of St. Louis, VII, 1895). 

 Under the above title the author has published a catalogue of the 

 Vnlonidce of the state of Arkansas, with partial bibliographic refer- 

 ences and copious notes. The species are arranged in alphabetical 



