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



"Length, including canal, about 1.00 inches; breadth, 0.91 inch; 

 angle of spire, about 67°." 



In the collections from Huerfano park, Colorado, there are a number 

 of specimens that are believed to belong to this species although in the 

 type and other examples from Coalville, Utah, only the general form 

 and a part of the surface features are preserved. The Colorado speci- 

 mens show the following additional characters: The surface ornamen- 

 tation consists of lines of growth and rather distant rounded transverse 

 costae which never entirely cross the whorls of the spire and in many 

 individuals are shortened into obtuse nodes, or become obsolete, espe- 

 cially on the last whorl. In some cases these nodes are almost con- 

 cealed by the succeeding whorl thus leaving the spire nearly smooth 

 and giving an undulated outline to the sutures which are not very dis- 

 tinctly impressed and are sometimes glazed over by a deposit of callus. 

 Some examples also show faint revolving lines. The outer lip is simple 

 and sharp, and the inner lip has a thin deposit of callus which seems 

 to have spread over the spire in the adult. The columella bears below 

 the middle one very prominent fold that is hardly visible in the aper- 

 ture view of a perfect specimen. The angle of the spire varies consid- 

 erably as is shown by the figures, and the number of volutions is six 

 or seven instead of four. 



I am very much in doubt as to the generic relations of this species, 

 and the material at hand is not sufficient to show all of its characters 

 fully. It seems, however, to be allied to Fasciolaria? (Cryptorhytis) 

 flexicostataM. & H. It is one of those early generalized forms that 

 seem to stand between the Fasciolariidse and the Volutida3 though this 

 species is more closely related to the latter family. 



Locality and position. — In the " second ridge" at Coalville, Utah, and 

 with similar associates in the Pugnellus sandstone, Poison canyon, 

 Huerfano park, Colorado. 



Genus PYROPSIS Conrad. 



Pyropsis coloradoensis n. sp. 



PI. xxxn, Figs. 6-8. 



Shell of rather large size, pyriform, consisting of four or five rapidly 

 increasing volutions ; spire in some specimens much depressed, in others 

 rather prominent; suture distinct, bordered below by a revolving 

 ridge that gives it a channeled appearance; whorls bicarinate around 

 the middle, the upper carina the stronger, obliquely flattened above 

 and rather abruptly contracted below into the canal, which is moder- 

 ately long and slightly curved. On the whorls of the spire only the 

 upper slope above the greater carina is exposed. In addition to the 

 carinas, that are prominent and more or less nodose on the body whorl, 



