4()() CARHONIFEROl'S FORMATIONS AND KAUNAS OF COLORADO. 



closoly ri's('iul)lew ^{.rlis/mi fifevtmsiana Meek and Worthen. Wc hiiv(M)iily afow not 

 viTv perfi'ct oxamples of this species and all of its characters can not be niadc^ out. 

 'nic liciijlit of one specimen is about '2 mm., and the greatest diameter about 0.75 

 nnn. Tins specimen has 6 whorls. 



Locality. — Grand River region, Glcnwood Springs (station 219^.) 



LOXONEMA Phillips, 1841'. 



LOXONF.MA PARVUM CoX? 



1857. i'liimiiilzia parm. Cox, Geol. Surv. Kentucky, vol. 3, p. 567, pi. 8, figs. 3, 3a 



Coal Meajsures: Daviess County, Ky. 

 1898. Loxonema panmm. Weller, U. S. Geol. Surv., Bull. No. 153, p. 335. 



This is a pretty little species, but we have of it only a .single specimen. The 

 length is somewhat over 2 mm. and the greatest diameter about 1 mm'. The volu- 

 tions are 6 in number, the rate of e.xpansion is rather rapid, and the tinal volution at 

 the aperture makes up about one third the full length of the shell. The ornamenta- 

 tion consists of moderately strong longitudinal costaa, of which there are about 11 on 

 one side of the volution next the last. The aperture is rather large. 



This shell in size, shape, and ornamentation is very similar to Cox's species, 

 Loxonema parvum. It differs in having the sutures between the volutions more 

 nearly horizontal, and in the fact that the volutions themselves instead of being- 

 convex are much flattened. 



Locality and horizon. — Grand River region, Glenwood Springs (station 2193). 



Loxonema plicatum Whitlield. 



1882. Loxonenia jMc^itum. Whitfield, New York Acad. Sci., Ann., vol. 2, p. 231. 



Coal Measures: Carbon Hill, Hocking County, Ohio. 

 1891. Loxonema plicatum. Whitfield, New York Acad. Sci., Ann., vol. 5, p. 601, pi. 15, figs. 14, 15. 



Coal Measures: Carbon Hill, Hocking County, Ohio. 

 1895. Loxonema plicatum. Whitfield, Geol. Surv. Ohio, Rept., vol. 7, \>. 486, pi. 11, figs. 14, 15. 



Coal Measures: Hocking County, Ohio. 



The two not very perfect specimens which I have referred to Loxonema plicatum 

 are certainly nearly related to Whitfield's species, even if not specifically identical 

 with it, as is believed probable. They much resemble in shape the form which 1 

 identified as Loxonema jjeoriense., but even as internal casts preserve traces of the 

 characteristically notched or rugose surface ornamentation. 



Locality and horizon. — San Juan region (stations 2342, 2344); Rico formation. 



Loxonema? peoriense Worthen. 

 PI. X, fig. 8. 

 1884. Loxonema peoriense. AVorthen, Illinois State Mus. Nat. Hist., Bull. No. 2, p. 7. 



• Coal Measures: Peoria County, 111. 

 1890. Loxonema peoriense. Worthen, Geol. Surv. Illinois, Rept., vol. 8, p. 139, pi. 23, figs. 10, 10b. 

 Coal Measures: Peoria County, 111. 



