Art. IX.] Herrick-Johnson, Geology of the Albuquerque Sheet, 2 1 1 
Ro stellites ambigua^ Stanton. 
Plate XXIX, Fig. i. 
A number of fragments seem to have the characters of 
the species quoted though they indicate a larger form than that 
described by Stanton. With that species it agrees in having 
two folds in the Columella. The surface is strongly ribbed and 
also has fainter revolving striae on the body whorl. 
The species was originally described from the Pugnellus 
zone of Colorado, a horizon occupying a position above the Fort 
Benton series. Our form is abundant in the cephalopod shales 
at the foot of the Fox Hills division, or immediately below it. 
Ro stellites dalli^ Stanton. 
Plate XXIX, Figs. 3 and 5 ; Plate VII, Fig. 8. 
This species is apparently common in the sandstone above 
the lignite east of San Francisco and at the monocline east of 
Island mesa. Fig. 3 is faulty in not showing the full height of 
the spire. Other and larger specimens are more characteristic 
though the revolving striae are more pronounced upon the up- 
per part of the body whorl than in the type. The folds of the 
columella are nearly obsolete. The same species has also been 
found in the shales above the coal at Carthage. 
Anchura (?) fusiformisy Meek. 
Specimens from various places in the Rio Puerco valley, 
the original locality, show the revolving striae and general char- 
acters but are insufficient to verify the suspicion expressed by 
White that the' generic reference is incorrect. 
Volutomorpha (?) nova-mexicanay sp. n. 
Plate XXIX, Fig. 2. 
This beautiful species is abundant in the sandstones above 
the lignite in the upper Fox Hills at Una de Gato, east of the 
Sandias and at the monocline east of Island mesa. Not having 
seen the whole length of the columella the generic reference 
remains doubtful. 
Shell of rather large size, elongate ovate in general form ; 
