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



and the entire canal, measures, without restoration, 109 mm in length and 

 49 mm in breadth. This large specimen differs somewhat in form from 

 the others and it is the one that shows line revolving striae on the ear- 

 lier whorls of the spire. If better collections should prove that two 

 species are represented the name here proposed should be used for forms 

 like that represented by Figs. 1 and 2 of PI. xxxiv. 



I do not know any described species nearly related to this one and 

 its generic affinities are not very clear. In general form and in the 

 character of the plaits of the columella it is quite like Eostcllites. In 

 other respects it suggests Volutomorpha, and perhaps it should be re- 

 garded as intermediate between these two groups. 



Locality and position. — In the Pugnellus sandstone near Malachite 

 and in Poison canyon, Huerfano park, Colorado. About a dozen more 

 or less fragmentary specimens were obtained. 



CANCELLARIID^:. 



Genus CANCELLABLE Lamarck. 



Cancellaria malachitensis n. sp. 



PI. xxxiii, Figs. G and 7. 



Shell small, short fusiform, comparatively thick; spire moderately 

 elevated, conical, consisting of three or four whorls; body whorl very 

 large, rounded, produced below into a short, broad canal. Surface 

 beautifully cancellated by strong revolving and transverse lines. On 

 the body volution there are about fifteen of the revolving lines of which 

 two or three nearest the suture are considerably larger than the others 

 and separated by broader furrows. On the spire only four revolving 

 lines are visible. 



The aperture is not complete in any of the specimens, but it is evi- 

 dently narrow ovate in outline, and the columella bears three strong 

 plaits, of which the first and second are very close together, and the 

 posterior one is more remote and the strongest. 



Length of one of the larger specimens, 18 mm ; breadth, 9 mm . 



Locality and position. — In the Pugnellus sandstone near Malachite, 

 Huerfano park, Colorado; represented by three specimens. 



Genus ADMETOPSIS Meek. 



Admetopsis rhomboides Meek. 



PI. xxxiii, Pig. 3. 



Admete? rhomboides Meek, 1873, Ann. Rept. U. S. Geol. Sur. Terr, for 1872, p. 501. 



Admete? gregaria Meek, 1873, ibid. 



Admetopsis rhomboides White, 1879, idem for 1877, p. 317, PI. ix, Figs. 6a and b. 



Original description : 



" Shell rather small, rhombic- suboval, or short subfusiform, the length 

 being slightly more than twice the breadth at the widest part, which is 



