6 THE UNIVERSITY SCIENCE BULLETIN. 



dition; last whorl slightly descending at the aperture; peristome thin 

 and acute, slightly expanded on the basal portion ; umbilical region deeply 

 impressed, the perforation being minute. Greatest diameter, 17.50. Least 

 diameter, 16. Altitude, 13. 



Type in the University of Kansas from Cove Inlet, John Day river, 

 Oregon, collected by H. T. Martin in 1907. 



A single specimen was obtained. The dome-shaped shell and 

 thin, acute peristome prevents its being classed as Polygyra 

 dalli, the species with which it is most apt to be confused. Its 

 correct generic position cannot be stated because of minor 

 shell differences which separate many of the groups of recent 

 pulmonates. It resembles in general shape some of the Gas- 

 trodo7iias as intertexta, for instance. The fact that the lip is 

 slightly expanded below is the chief character which casts 

 some doubt upon its being a Gastrodoyita. This condition is 

 met with in Oreohelix and our shell resembles in form and size 

 sonie of the dome-shaped varieties of 0. cooperi, as, for in- 

 stance, apiarium Berry. It might be placed directly in this 

 genus were it not for the differentiating characters of the 

 umbilicus. 



The specimen is slightly defective as shovni by the photo- 

 graphs but it is sufficiently intact it seems to make the species 

 easily recognizable in the future. * 



There is a second specimen in the collection of the Univer- 

 sity of California which is similar in all respects to the type, 

 except perhaps it is a little better preserved. 



Pyramidula mascallensis Hanna, New species. 



(Plate I; figures 4, 5, 6.) 



Whorls six and three-fourths, rounded below^ and flat above; spire not 

 greatly elevated; suture apparently channeled; last w^horl carinated 

 through the first two-thirds, the carina gradually disappearing; latter 

 part of last whorl depressed below the carina of the one preceding; the 

 shell substance of the apical whorls is preserved but sculpture is absent; 

 the body whorl is an internal cast but shows on the upper side some 

 coarse uneven growth ridges; umbilicus widely open. Greatest diameter, 

 33.50. Least diameter, 30.25. Altitude, 28. 



Type in the University of Kansas from Cove Inlet, John Day river, 

 Oregon, collected by H. T. Martin in 1907. 



Only the type specimen was secured so that a statement of 

 variation cannot be given. The flattened upper whorls and 

 the apparently deeply channeled suture distinguish this shell 

 from other species. It may represent a new generic type, but 

 the genera of land shells were so often based upon anatomical 



