68 University of California Publications. [Geology 



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HELIX (EPIPHEAGMOEPHOBA?) DUBOSIA nom. prov. 

 Figs. 3 and 4. 



Type specimen No. 10001. Univ. Calif. Col. Invert. Palae., Middle John 

 Day, John Day Valley, Oregon. 



Shell orbicular, flattened, discoidal, periphery angulated or 

 obtusely carinated ; whorls six or more, deeply sutured and ex- 

 hibiting strong growth striae. Apex whorls closely and slightly 

 pitted. Aperture and umbilical region covered by a portion of 

 the matrix in which the shell was imbedded. 



Diameter (maximum), 24 mm., probably 26 to 26^ mm. when 

 perfect. Elevation, about 10 mm. A sufficient portion of the 

 shelly substance intact admits of the above description. Number 

 of specimens, six ; of these the individual described is the largest 

 and most perfect. The smaller examples consist mainly of the 

 upper whorls. 



AVith more and better material it is quite probable that the 

 foregoing might prove to be an angulated, dwarfed, depressed 

 aspect of the living fidelis, or mormomim ; it also suggests the 

 form known as Hillebrandi. Nearly all of the material is in a 

 very unsatisfactory condition, with no color indications to assist 

 in determination. While for these reasons the conclusions may 

 be regarded as more or less arbitrary, the general character and 

 relationship is believed to be fairly well pointed out. 



PYBAMIDTJLA LECONTEI, n. s. 

 Fig. 2. 



Type specimen No. 10000. Univ. Calif. Col. Invert. Palae., John Day, 

 Bridge Creek, Oregon. 



Shell small, orbicularly depressed, widely and deeply umbili- 

 cated; whorls four and a half to five, rounded, closely and con- 

 spicuously ribbed except on the apex, which is nearly smooth ; the 

 ribbing extending into the umbilical cavity; the grooves between 

 the ribs nearly as wide as the ribs are thick ; the suture deep ; 

 aperture . nearly circular or rounded lunate ; edge of the lip 

 simple. Diameter (maximum), 81 mm. Elevation, nearly 5 mm. 

 A single example ; the last whorl has been broken back somewhat ; 

 the maximum diameter was probably 9 to 9-J mm. The specimen 

 appears to be scarcely mature. The number, prominence, and 



