DESCRIPTIONS OF SPECIES. 415 



1899. Ai-iculopeden occidenialds. Girty, U. S. Geol. Surv., Nineteenth Ann. Eept., pt. 3, p. 578. 

 Upper Coal Measures: McAlester quadrangle; Atoka quadrangle. 



1900. Ainculopecten occidentals. Beede, Univ. Geol. Surv. Kansas, Rept., vol. 6, p. 114, pi. 13, fig. 7. 

 Upper Coal Measures: Turner, Eudora, Lawrence, Topeka, Wabaunsee County, Kans. 



1900. Ariculojiecienoccidenialis. Knight, Univ. Wyoming, Wyoming Exp. Sta., Bull. No. 45, pi. 3, fig. 3. 



This species is rare and small in the collections from the Hermosa formation, but 

 in those from the Rico formation it is usually both large and faii'ly abundant. 



The specimens from station 2219, in the Rico quadrangle, are poorly preserved, 

 and some of them look much as if they might belong to Lima retifera. The fact 

 can not, however, be satisfactorily ascertained, and since some of the specimens cer- 

 tainly do not belong to that species, it seems best to give the others no separate 

 record. 



Locality and horizon.— ^?in Juan region (stations 2219, 2231, 2337, 2340, 2341, 

 2842, 2347); middle portion of the Hermosa formation and common in the Rico for- 

 mation. Cre.sted Butte district (station 2317 ?); Maroon formation. 



AvicoLOPECTEX PELLUCiDUS Meek and Worthen. 



1860. Aviculopeclen pellueidus. Meek and AVorthen, Acad. Nat. Sci. Philadelphia, Proc, p. 455. 



Coal Measures: Adams County, 111. 

 1866. Adculopeden pellucidm. Meek and Worthen, Geol. Surv. Illinois, Eept., vol. 2, p. 327, pi. 26, figs. 

 5a, b. 



Lower Coal Measures: Adams County, 111. 



Only one specimen of this species has come to hand, and that broken. In its 

 small size and cancellated surface ornamentation the specimen resembles Meek and 

 Worthen 's species, but a satisfactoiy identification is not possible. 



Locality and horizon. — San Juan region (.station 2221); upper portion of the 

 Hermosa formation. 



AVICDLOPECTEN RECTILATERAKIUS CoX. 



1857. Avictda recta-laterarea. Cox, Geol. Surv. Kentucky, vol. 3, p. 571, pi. 9, fig. 2. 



Coal Measures: Union County, Ky.; Gallatin County, 111. 

 1898. Aviculopecten rt'ctilaterariiis. Drake, Am. Phil. Soc, Proc, vol. 36, p. 405, pi. 9, fig. 6. Reprinted 

 without change of date, page, etc., in Leland Stanford Junior University Pub.; Cont. Biol. 

 Hopkins Seaside Lab., No. 14. 

 Upper Coal Measures, Poteau group : In shale overlying the May berry coal at the mines 4 miles 

 northwest of Poteau, Ind. T. 

 1900. Adcidoj^eden reci'daterarius. Beede, Univ. Geol. Surv. Kansas, Rept., vol., 6, p. 15. 

 Upper Coal Measures: Leavenworth, Wyandotte County, Kans. 



None of the material is well preserved, and from station 2226 (in the Rico quad- 

 rangle) but a single specimen was obtained. The fossils from Leadville received the 

 same identification in the monograph of that region." 



o U.S. Geol. Snrv..Mon,, vol. 12, 1886, p. 67. 



