100 THE NAUTILUS. 



margin, which is slightly curved, supero-anterior slope slightly 

 marked, curved to nearly straight, anterior end rounded angular, 

 posterior part subtruncate, inferior margin moderately curved ; sur- 

 face with fine to very fine irregular striae, shining, shell thin, trans- 

 parent to translucent, of wine to deep amber color; hinge of the 

 same formation as that of P. noveboracense, but less curved and 

 slighter ; ligament rather short and strong. 



Long. 3.6, alt. 3, diam. 2 m. (100 : 83 : 55.5) average. 



Long. 4, alt. 3.3, diam. 2.4 m. 



Soft parts not examined. 



Habitat : North America, probably of wide distribution ; seen from 

 the Atlantic States from Maine to Virginia ; New York (near Mo- 

 hawk), Ohio, Michigan, Indiana; common e. g. in the vicinity of 

 Washington, D. C, and Alexandria, Va., where it was collected in 

 1896 by the writer, and in the vicinity of New Philadelphia, O. 



In shape it has a resemblance to P. noveboracense Pr., with which 

 it seems to range under the same group, but is smaller, the beaks are 

 less prominent, and it is at once recognized by its transparent shell, 

 its color and glossy surface. In the latter respect, it is also 

 similar to P. splendidulum St., but averages larger and its shape 

 is different. Like a number of other Pisidia, this has been a stumb- 

 ling-block for over ten years; but it seems constantly distinct, and 

 is of wide distribution. 



Erratum. On p. 88 of the December number line 4 from bottom, 

 correct Sillycash to Lilycash creek. 



LAND SHELLS FROM EAST SHORE OF CAYUGA LAKE. 



BY SILAS C. WHEAT. 



The following list of land shells were found by the writer in July 

 and August, 1905, on the east shore of Cayuga Lake, between Ithaca 

 and Portland Point, N. Y., and between the lake and the top of the 

 cliffs : 



Omphalina fuliginosa Griffith. Abundant, woods. 



Omphalina inornate. Say. Common, woods. 



Vitreaferrea Morse. Rare, one found. 



