THK NAUTILTTS. 113 



52 mill. Kespiratory orifice 2; mill, from anterior border. Body 

 subcyliixlrical, somewhat taperinu', rather blunt at end. Distance 

 from posterior end of mantle to end of body 8 mill. Back with a 

 blackish band reaching a little more than half its length, and lateral 

 darker blackish bands reaching its whole length. Reticulations dis- 

 tinct, " foliated." Sole strongly transversely striate-grooved, but not 

 differentiated into tracts. Jaw pale, strongly striate, moderately 

 curved, not ribbed. Lingual membrane long and narrow. Teeth 

 about 35-1-35. Centrals tricuspid, laterals bicuspid, marginals with 

 a large point, and one (sometimes two) small outer points. Liver 

 pale chocolate. 



Found by Mr. A. F. AVickham under the bark of rotten logs in 

 the woods around Lake Creur d'Alene, Idaho, 1889. 



In its reticulations, and general external characters, this species 

 resembles P. luidersoni, of which it is ])ossibly a variety. 



OCCURRENCE OF HELICINA OCCULTA SAY, IN BROWN CO., WIS. 



BY GEO. T. MARSTON. 



My first knowledge of the occurrence of this mollusk in Brown 

 County, was in the spring of 1886, when I found a single "dead 

 shell" on the shore of Fox river about two miles south of DePere. 



Again, on May 13, 1888, 1 found five (5) specimens, all alive, upon 

 the banks of a small creek which, rising in a limestone ridge about a 

 mile from where the specimens were procured and about three miles 

 east of DePere, flows into East or Devil River and eventually into 

 Green Bay. 



The shells were found, within a space of 300 feet, along the banks 

 of this creek, the land above and below this being under cultivation. 

 They were isolated and were obtained only after careful search, my- 

 self and an assistant going over the place frequently. 



A week later when another search was made, and in the spring of 

 1889, no specimens could be found. 



The little tract inhabited by this shell is very rich in land and 

 fresh water mollusks, and seems to be a favorite resort of Helicodiscus 



lineata, which lives there in great numbers. 



t 

 Green Bay, Wis., January 2%, 1890. 



