48 THE NAUTILUS. 



Helix iiortexsis Mull. The uniform lemon-yellow form has 

 l)een found by Dr. Benjamin Sharp in the town of Xantucket,Xau- 

 tucket Island. — Ed. 



PUBLICATIONS RECEIVED. 



A NEW .SPECIES OF FRESH-WATER MOLLUSK, by B. Shimek ( Ex. 

 Bull. Lab. Nat. Hist. State Univ. of Iowa, vol. i, p. 214). A spe- 

 cies of Ancylus with very strongly recurved apex is described and fig- 

 ured by Prof. Shimek in this paper as A. obliguus.^ The right side 

 of the shell is slightly incurved or straight. The largest specimen 

 measured Si mm. in length, 1.8 in width, 1.5 mm. high. It oc- 

 curs not uncommonly about 5 miles east of Lincoln, Nebra.ska, in 

 Dead ^Nlan's Run, a streamlet with numerous pond-like enlarge- 

 ments. Specimens were found by Mr. Shimek at all seasons of the 

 year, adhering to the shells of A nodonta plana, sticks, leaves, etc. 



This same form, or a very similar one, has been found, by the 

 writer, back of Rock Island, Illinois, in a certain swamp well known 

 to those bare-footed urchins who offer pond-lilieS at " only five cents er 

 bunch, jNIister" on the streets of the " Three Cities."' 



Certain indications led me at the time of finding this shell to refer 

 it to Gundlachia instead of Ancylus ; and it may be worth while to 

 follow this clew further. If my supposition proves to be correct, 

 Gundlachia will furnish the most extraordinary case of dimorphism 

 known among our American mollusks. — H. A. Pilshry. 



Catalogue of Xorth American Shells collected by Henry 

 Hemphill. This pamphlet catalogues 1763 species and varieties of 

 land and marine shells collected by the author, including a majority 

 of the species found on the Californian and Floridan coasts. 



List of the Mollusks of Ottawa, as recorded in the Trans- 

 actions of the Ottawa Field-Xatumlists Club up to April 1st, 1890, is 

 given in the Ottatva Naturalist, April, 1890. It comprises 127 spe- 

 cies, giving that part of Canada quite a varied fauna, richest in 

 Cyrenidce (14 species), Unionidce (27 species), and Limnceidce. 

 From F. R. Latchford.— IT. A. P. 



Les Mollusques de la Province de Quebec, by M. L'abbe 

 Provancher (in Le Xaturaliste Canadien, March, 1890). Includes 

 the marine, land and fresh-water forms. 



^ This name is three times preoccupied in Ancylus. If the species proves 

 really distinct from Gundlachia Meekiatia it might be called Ancylus Shimekii. 

 * Davenport, Rock Island .ind Moline are locally known by this name. 



