DESCRIPTIONS OF SPECIES. 319 



of OUT inadequate knowledge of the fossils which Saj^ called Miliolites secaUcus, it 

 seems to me inadvisable at present to substitute it for the name in current use. 

 Furthermore, since Say states that 21. secalieus has a length of three-tenths of an 

 inch and a diameter of one-sixteenth, it appears that his species is larger and differ- 

 ently proportioned from the one under discussion. 



It may not be out of place to mention at this point that evidence exists of the 

 presence of foraminifers other than Ficsulina in the Colorado Carboniferous. Near 

 Ouraj^ (station 2195b) minute shells whose foraminiferal nature is very probable 

 occur in considerable numbers. As they are known only in thin sections, and as 

 identification in this condition is very difficult, it seemed unprofitable to continue 

 their investigation. 



Locality and horizon.— Sdin Juan region (stations 2199,2208,2210,2211,2213, 

 2221, 2227, 2232, 2233, 2235, 2237, 2286, 2339); lower, middle, and upper portions of 

 the Hei-mosa formation. Ouray (.stations 219-1, 2195b, 2195c); Hermosa formation. 

 Crested Butte district (stations 2290, 2293, 2305, 2308, 2321); Weber limestone and 

 Maroon formation. 



FusuLiNA CYLiNDRicA var. VENTEicosA Meek and Hayden ? 



1858. FusuUna cylindrica var. rentricosa. Meek and Hayden, Acad. Nat. Sci. Philadelphia, Proc, p. 261. 

 Carboniferous: Juniata and Manhattan, Kans. 



1859. Fiisii!'ii<i ci/Hndrica var. rentricosa. Meek and Hayden, Acad. Nat. Sci. Philadelphia, Proc, p. 24. 

 Coal Measures: JManhattan and Juniata, Kans. 



1873. Fusulina veniricom. Meek and Worthen, Geol. Surw Illinois, Rept., vol. 5, p. 560, pi. 24, lig. 8. 

 Coal Measures: Fulton and Peoria counties, 111. 



1874. Fusidma rentricom. Meek. Am. Jour. Sci. (3), vol. 7, p. 484. 



In the Crested Butte region (station 2312) occurs a -form of Fusitlina in moder- 

 ate abundance which differs considerably from the type common in the rest of the 

 collection. It is smaller and in shape nearly spherical. Its axial diameter is under 

 1 mm. and its radial diameter is somewhat less. 



This form seems rather closely related to that figured by Meek and Worthen 

 under the name of Fusulina ventricosa, although it is vety much smaller. I mistrust 

 that the F. rantricoHa of their reference may not be the same as that to which the 

 name F. cylindrica var. ventricona was originally applied. 



Loccdity and horizon. — Crested Butte district (station 2312); Weber limestone. 



SPONGIA. 



HYALOSTELIA Zittel, 1878. 



Hyalostelia sp. 



Crossing the surface of a slab of limestone from near Molas Lake in the Silver- 

 ton quadrangle (station 2279) are large numbers of an unusual fossil which I at first 



