Geol.— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. I15 



61. Scaphites klamathensis, sp. nov. 



Plate III, Figs. 78-81. 



Shell small, compressed, ovate in outline, measuring only 1.3 cm. in length, 

 .9 cm. in width, and .35 cm. in greatest thickness. Umbilicus not wide; 

 whorls clasping generally about one-half of the preceding volution in youth 

 and apparently suppressing the umbilicus in age; section of whorls sub- 

 circular or subquadrate, flattened on the dorsal side of the body- whorl, 

 which is somewhat inflated in the region of the bend. The surface is orna- 

 mented with fine ribs or striations, which cross the ventral surface and con- 

 verge toward small nodes near the umbilical margin of the whorl. These 

 ribs are seen only upon the body-chamber, and the nodes appear only upon 

 the last two-thirds of the same. The suture is simple, consisting of a large 

 siphonal lobe and a very much smaller lateral one, with one or two sec- 

 ondary lobes. There is one lateral saddle upon the inner side of which is an 

 indentation that might pass for an auxiliary saddle. 



The aperture of this species deserves special notice. It is bordered by a 

 distinct lip which is immediately preceded by a rather wide and shallow con- 

 striction which extends upward toward tUe dorsum without apparently 

 reaching it; from each side of the aperture a wing-like expansion extends to 

 the preceding coil, against which it rests, thus reducing the aperture to an 

 oval opening upon the ventral side of the shell. The surface of these expan- 

 sions are ornamented with concentric undulations that begin at the middle of 

 the mouth-border, i. e., at the middle of the side of the aperture. 



In all respects except as to size and form of aperture, 

 S. klamathensis exactly agrees with S. larv<^formis M. & H. 

 from the lower portion of the Colorado group of the upper 

 Missouri. Meek and Hayden's figures do not show the 

 buccal border, and apparently it was not known. There 

 is reason to believe that S. klamathensis is only a small 

 form of S . larvcBforniis, but until this can be more satisfac- 

 torily shown, it seems preferable to designate the Shasta 

 Valley species by a separate name. It is also related to 

 S. I tier mis. 



Occurrence. — This species is one from the small collec- 

 tion presented to the author by Mrs. H. B. Gillis of Yreka, 

 and comes from the northern border of Shasta Valley, to 

 the south of the Klamath River. 



The type is in the collections of the California Academy 

 of Sciences. 



