8 THE UNIVERSITY SCIENCE BULLETIN. 



Pacific coast states to-day. The latter, however, is smaller; 

 some specimens of dalli are almost as large as thyroides of 

 Kansas and Missouri. The umbilicus of the fossil species is 

 covered by the narrowly reflected peristome and its junction 

 with the body whorl is deeply seated. There appears to be 

 no tendency for the peristome to descend more or less abruptly 

 near its outer termination with the body whorl. 



Polygyra expansa Hanna. New species. 



(Plate I; figures 7, 8, 9.) 



Whorls about seven, somewhat flattened above and below; sutures not 

 deeply impressed; lines of growth apparently uneven on the last whorl 

 and broken into ridges parallel thereto ; the last whorl of the type is sub- 

 carinate at its beginning due to pressure, but is flattened naturally on the 

 lower side; axis imperforate and covered with heavy shell substance; the 

 junction of the peristome with the body whorl in the umbilical region is 

 marked with a distinct angular depression; it is not a gently concave 

 depression as found in such recent Polygyras as albolabris. Greatest 

 diameter, 32. Least diameter, 28.50. Altitude, 17. 



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

 Oregon, collected by Mr. H. T. Martin. 



A single specimen was secured and it is not in as good con- 

 dition as would be desired. Its characters are so distinct, 

 however, that it cannot be referred to any known form. The 

 imperforate axis covered with heavy callus places it in Poly- 

 gyra rather than in Epiphragmophora. However, it is flat- 

 tened on the base and has a tendency to be slightly carinated 

 as some forms of fidelis Gray of the latter genus. 



A single, and better preserved specimen in the University of 

 California shows, in addition to the above characters, that the 

 outer lip abruptly descends at its junction with the body whorl 

 for a distance of 4 mm. 



Polygyra martini Hanna. New species. 



(Plate I: figures 10, 11, 12.) 



Whorls five, well rounded, the last being conspicuously enlarged 

 vertically; sutures moderately impressed; lines of growth very fine for 

 a shell of this size and very regular, crossed by less impressed revolving 

 striae which are most noticeable on the body whorl; umbilical region 

 deeply impressed; lip thickened by callus and reflected over almost the 

 entire umbilicus; no indication of a noticeable deflection of the peristome 

 at its junction with the body whorl. Greatest diameter, 34.50. Least 

 diameter, 25. Height of body whorl, 19. Altitude without body whorl, 

 18. Altitude (total), 28. 



