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



Solemya ? obscura Stanton. 



(Bull. U. S. G. S. 106, p. 95.) 



Our single specimen agrees with the original description in 

 size, general shape, growth lines, and in the position of the 

 beak. 



Locality and position, — Occurs with Trigonarca depressa 

 at Neck 3. 



Anomia propatoris White. 



(Bull. U. S. G. S. 106, p. 67.) 



Specimens agree closely with the type except that they are 

 slightly irregular in shape. 



Locality and position, — This species is rather abundant in 

 layers in a dark sandy shale on the eastern side of the road 

 fifteen miles southeast of Cabezon on the northwestern portion 

 of the Albuquerque sheet. The strata are uppermost Fort 

 Benton. 



Gastropoda. 

 Tarritella whitei var stantoni n. var. 



Shell rather large, 20 to 35 mm long with diameter of the last 

 whorl 10 to 12 mm . Sides straight. Sutures broadly but rather 

 shallowly impressed. Larger shells have from 18 to 20 whorls. 

 Surface of each whorl marked with three to five compressed 

 and elevated spirals, separated by wider interspaces which are 

 either smooth or covered by finer revolving striae. The larger 

 spirals upon the larger whorls are rarely nodose. The apical 

 angle varies from 15° to 17°. 



This variety differs from the species T. whitei in that it has 

 fewer large spirals, the smaller ones usually absent, and the 

 larger ones very seldom nodose (but one nodose spiral was 

 noted). This form evidently completely agrees with the varie- 

 tal form from Colorado noted by Stanton but not named by 

 him.* 



With these differences so constant over such a wide terri- 

 tory, it seems to us that for the sake of stratigraphic exactness 

 a distinction should be made. 



This variety differs from T. galisteoensis Johnson in its 

 shorter whorls and smaller apical angle. That form has 10 

 whorls in a length of 30 mm from the apex of the shell, and 

 according to the pictures the apical angle is about 20°. The 

 finer intermediate revolving striae are totally absent in that 

 species. 



*U. S. G. S. Bull. 106, p. 131. 



