812 CAKBONIFEBOUS i-"0BMAT10NS AND FAUNAS OF CULOKADO. 



Tlu" only specimen in the collection is iui internal cast whicli shows a nipidly 

 cxpaudino-, slightly curved, conical shell, the apex of which lias been broken away. 

 'rh()Mi;li somewhat larger, it rescnihles in general sluipe Keyes's figure of Orthonyehia 

 foriHdxd. but the lobation is considerably more indistinct than in his type, and I am 

 unable to state detinitel}' whether, as in it, there are exactly five lobes or not. 



Locality and horison. —San .luiin region (station 2382); Ouray limestone. 



STRAP AROLLUS Montfort, 1810. 



Strapakollus luxus White. 



1875. Euomphalm luxus. White, U. S. Geog. Geol. Surv. W. 100th Mer., Kept., vol. 4, p. 94, pi. 5, 

 figs. 13a, b. {Whole volume published in 1877.) 

 Subcarboniferous: Ophir City, Utah. 

 1877. Euoiiiphalus laxus. Hall and Whitfield, U. S. Geol. Expl. 40th Par., Kept., vul. 4, p. 260, pi. 4, 

 figs. 24, 25. 

 Near base of Wasatch limestone (Waverly): Dry Canyon, Oquirrh Mountains, and Logan 

 Canyon, Wasatch Range, Utah. 



My material represents for the most part only internal casts, but, fortunately, 

 some specimens show clearly that the peritreme was carinated and had a section 

 comparable to that of Sfiujjarollm hnvus. The rise of the spire is also about the 

 same, and a comparison with the type and other typical specimens leaves little doubt 

 that the Colorado form is conspecitic. The latter attains a greater size than has yet 

 been observed in St. lunous from the t^'pical area. Some specimens show a major 

 radius of 35 mm., and one has been observed still larger. 



A direct comparison of the types of the two species leads me to believe that 

 Straj)arollus luxus is probably a synonj^m of StraparoUus suhplamis Hall (Weller 

 incorrectly refers the latter to Phanerotinus)," and Straparollus latus should also be 

 examined in the same connection. This species is abundant in the Crested Butte 

 region, where alone it has so far been brought to light. 



Locality and horizon. — Crested Butte district (stations 2352, 2355, 2357); Lead- 

 ville limestone. 



Straparoli.us ophieensis Hall and Whitfield. 



1877. Euomphalus (Straparollus) ophirensis. Hall and Whitfield, U. S. Geol. Expl. 40th Par., Eept., 

 vol. 4, p. 261, pi. 4, figs. 26, 27. 

 Waverly group: Dry Canyon, Oquirrh Mountains, Utah. 



This species has been identified at three localities, two of them (stations 2362 

 and 2363) being in the Aspen region, the other (station 2352) in the Crested Butte 

 region. The specimens from Fiying Pan Creek (station 2362) are identified with 

 some confidence. A less degree of assurance is felt regarding two small imperfect 

 examples from station 2352 and some very fragmentary specimens from station 2363. 



"V. S. Geol. Surv.. Bull. No. I.i3, p. 420. 



