138 COLORADO FORMATION AND ITS INVERTEBRATE FAUNA, [bull. 106. 



I follow Zittel in referring this species to Amauropsis. 



Locality and position. — Common in the Pugnellus sandstone at sev- 

 eral localities in Hnerfano park ; rare in the upper part of the Benton 

 shales on the Arkansas river above Pueblo, Colorado. 



Amauropsis ! utahensis White (sp.). 



PL xxx, Fig. 1. 



Lunatia utahensis White, 1876, Geol. Uinta Mts., p. 122. 



Euspira coalvillensis White, 1879, Ann. Rept. U. S. Geol. Sur. Terr, for 1877, p. 310, PI. 

 4, Figs. 2a and b. 



Eevised description : 



"Shell sub globose ; spire small, conical, acute, but not much 

 extended; volutions about eight when the apex is entire, last one 

 inflated, and, when adult, extended a little in front, and also poste- 

 riorly, near the border of the aperture; aperture obliquely ovate- semi- 

 lunar, somewhat abruptly rounded anteriorly; callus of the inner lip 

 apparently not much thickened, but thicker anteriorly than poste- 

 riorly; columnella rimate or almost solid, and nearly covered by the 

 callus of the inner lip, which seems not to be so closely appressed 

 against it as it is against the body-volution farther back. Surface 

 marked by the ordinary lines of growth. The figures on plate 4 are 

 restorations of this species, all the numerous examples in the collec- 

 tions being crushed except one or two sandstone casts. The examples 

 being somewhat numerous, afford a view of all the features shown by 

 the figures. 



" Length, from the apex to the anterior end of the aperture, about 

 4 cm ; breadth, across the aperture and body- volution, about 3J cm ." 



The material on which this species was based is very imperfect and 

 unsatisfactory, though it seems to justify the restoration given in the 

 figure. In the National Museum collection there is one specimen, from 

 another locality, of the same general form, that has a broad, open, 

 Gyrodes-like umbilicus, but it seems hardly possible that it can belong 

 to this species, or even to the same subgenus. 



In the second publication of the species the specific name was inad- 

 vertently changed from utahensis to coalvillensis and the original name 



was restored by the same author. 1 



According to Zittel 2 Euspira can not be retained even as a sub- 



generic name, and forms without an umbilicus resembling this and the 

 species described above are by him referred to Amauropsis, though it 

 seems to me that the species now under consideration might be re- 

 ferred with equal propriety to Ampullina or to Cernina. 



Locality and position. — Near the base of the Cretaceous section at 

 Coalville, Utah. 



1 Ann. Kept. TJ. S. Geol. Sur. Ter ^ for 1878, p. 29. a Handbuch der Palseontologie, n, p. 221. 



