DESCRIPTIONS OF SPECIES. 387 



1893. Spirifer cameratus. Hall and Clarke, Pal. New York, vol. 8, pt. 2, pp. 26, 38, pi. 32, figs. 9-15. 



(Advance distribution in fascicles.) 

 Coal Measures: Ohio; Illinois; Missouri; Iowa. 



1894. Spirifer cameratus. Hall and Clarke, Int. Study of Brach., pt. 2, pi. 26, figs. 7, -8. 

 Coal Measures:. Missottri; Illinois. 



1895. Spirifera camerata. Keyes, Missouri Geol. Surv., vol. 5, p. 83, pi. 40, figs, 5a-c. (Date of 



imprint, 1894.) 

 Coal Measures: Clinton, Kansas City, and Lexington, Mo. 



1895. Spirifei- cameratus. Hall and Clarke, Pal. New York, vol. 8, pt. 2, pp. 26, 38, pi. 32, figs. 9-15. 

 Coal Measures: Ohio and Illinois; Missouri; Iowa. 



1896. Spirifer cameratus. Smith, Am. Phil. Soc, Proc, vol. 35, p. 241. 



Upper Coal Measures: Sebastian County, Ark.; Poteau Mountain, Indian Territory. 



Lower Coal Measures : Conway County, Ark. 

 1896. Spirifer cameratus. Smith, Leland Stanford Junior Univ., Pub.; Cont. Biol. Hopkins Seaside 

 Lab., No. 9, p. 31. 



Upper Coal Measures: Sebastian County, Ark.; Poteau Mountain, Indian Territory. 



Lower Coal Measures: Conway County, Ark. 

 1898. Spirifer cameratus. Beede, Kansas Univ. Quai-t., vol. 9, p. 21, pi. 5. 

 1900. Spirifer cameratus. Beede, Univ. Geol. Surv. Kansas, Kept., vol. 6, p. 99, pi. 12, figs. 5-5e. 



Upper Coal Measures: Kansas City, Lawrence, Leconipton, Topeka, Grand Summit, Kans. 



This species, like the preceding, has a long range and an extended distribution 

 both in the Mississippi Valley and the Rocky Mountains. In Colorado it is fre- 

 quently present, but has not yet come to light in the Leadville region. 



Auiong the material referred to this species variation more or less marked has 

 been noticed in the fineness of the strife and the degree to which they are gathered 

 into fascicles. Nevertheless it has not been found practicable to establish satisfactor}' 

 subdivisions. Most of the material examined, however, is imperfect in one wa}' or 

 another. 



locality and ho ri.zo>i.— San Juan region (stations iildS, 2200, 2201, 2205, 2210, 

 2213, 2216, 2233, 2239, 2246, 2284, 2331, 2332); lower, middle, and upper portions of 

 the Hermosa formation. Ouray (station 2194); Hermosa formation. Crested Butte 

 district (stations 2293, 2303, 2305); Maroon formation. Grand River region (station 

 2324), Glenwood Springs (stations 2329a, 2329b). Dolores River region, Sinbads 

 Valley (station 2285); top of the Hermosa formation. 



SQUAMULARIA Gemmellaro, 1899. 



The name Retlcularia was proposed by McCoj^ in 1844" as a distinct genus, to 

 which he gave the following characters: 



" General character. — Hinge line shorter than the width of the shell; cardinal area 

 triangular; cardinal angles very obtusely rounded; mesial fold very slightly raised, 

 or none; surface ornamented with either fine longitudinal or transverse striae, or 

 most usual!}' reticulated by both; dental lamellaa perfectly parallel. 



"Synopsis Characters Garb. Limestone Foss. Ireland, Dublin, 1844, p. 142. 



