Shinier and Blodgett — Mt. Taylor Region, New Mexico. 61 



One specimen of larger size than 0. lugubris as described 

 by Conrad may be classed with 0. hellaplicata or O. blackii, 

 although Stanton regards all as the same species, 0. lugubris 

 being a form dwarfed by conditions. 



Locality and position, — Found rarely in brownish shales 

 along the road fifteen miles southeast of Cabezon in the north- 

 western part of the Albuquerque sheet, and in similar shales 

 along the road one mile southwest of Casa Salazar. The strata 

 of both localities are Fort Benton. 



0. anomioides var. nanus Johnson. 



(The Geology of the Cerrillos Hills, New Mexico, by Douglas W. 

 Johnson. School of Mines Quai't. 1903, p. 113.) 



Specimens agree with type description. This variety differs 

 from the species anomioides only in being smaller and thus 

 more delicate. 



Locality and position, — Common in a dark sandy shale in 

 the northwest corner of the Albuquerque sheet, fifteen miles 

 southeast of Cabezon. The strata are of uppermost Fort 

 Benton age. 



Gri/phcea kewberryi Stanton. 

 (Bull. U. S. G. S. 106, p. 60.) 



Agrees with description in all respects except the radiating 

 striae, which are absent in our specimens. This may be due to 

 imperfect preservation. 



Locality and position, — A single specimen was found in the 

 sandy shales of Fort Benton age at the foot of Great Neck, 

 and several in the brownish shales of upper Fort Benton along 

 the road fifteen miles southeast of Cabezon, 



Inoceramns labiatus Schlotheim. 

 (Bull. U. S. G. S. 106, p. 77.) 



Well preserved internal mold of one specimen. 



Locality and position, — The specimen was found east of the 

 road in brownish yellow sandy shales of upper Fort Benton or 

 possibly Niobrara age, fifteen miles southeast of Cabezon. 



1. dimidius var. labiatoides nov. var. (Fig. 3.) 



The specimens are well preserved and agree with the species 

 description in every particular except the surface markings. 

 Here minor concentric folds cover the larger folds and inter- 

 spaces alike. There are usually from two to four minor folds 

 between consecutive major ones. The major ones become less 

 and less prominent toward the beak, but the minor ones con- 

 tinue to be almost as strong over the umbo. Named from I. 

 labiatus because of similarity of surface markings. 



Locality and position, — This variety occurs rather abun- 

 dantly in a gray shaly sandstone of upper Fort Benton age. 



