284 OARHONIFEKOUS KOltM ATIONS AND KAHNAS OK ('()I,()KADi). 



1857. ■('urlKinilVriiiiN limestone: In l''n;;l;inil :il I'xillainl, Sell Ic, Kriiilul, Isle of Man, llcrliysliin', ric. ; 



in ScotUind lit Cat Oraij;, near Unnbar. 

 C'alciferous slate and Carboniferons linicstune: In .Ireland, Bunduran, liallydiiff, C'arrii,'alinc, 



Lisnapaste, Millecent, Tankardstown, Florence Court, Little Island, shore.s of Lou);li (Jill, 



valley of the Maine, Hook, St. Doolas, near Dublin, ote. 

 On the Continent at Vise and Tournay, ete., in Belgium; Uatingen, iii I'lussia; and also in 



America. 



Of this species there Is hut a .single specimen, somewhat fragmentary and poorly 

 preserved. It had previously been identilied as P. nevadeiislg, but can liardly Ije a 

 true representative of Meek's species. It is almost certainly of thojjimfiilosi/s tjqje, 

 but strictly speaking may not belong to that species. It much resembles the form 

 figured hy Davidson on plate 42, lig. 4, of his monograph (loc. cit;). It is a rather 

 large shell, with a distinct though not deep median sinus, crossed transversely by 

 closety arranged, concentric corrugations, and roughened by numerous tine pustules 

 or spine bases (?). 



This species is evidently related to the species from the Madison limestone which 

 I identified as P. scdbriculus Martin, but seems to be .specifically di.stinct. It is 

 unlike any form Imown to occur in the Oura^^ limestone (Devonian) or in the Her- 

 mosa formation (Pennsylvanian). 



Locality and horizon. — Aspen district (station 2362); Leadville limestone. 



Peoductus LyEvicosTA White. 



1860. Froductus larvicostus. White, Boston Soc. Nat. Hist., Jour., vol. 7, p. 230. 

 Burlington limestone: Burlington, Iowa. 



1874. Productus praitenianus (= ? P. lamcodus) . White, U. S. Geog. Geol. Surv. W. 100th Jler., Pre- 



lim. Eept. Invert. Foss, p. 17. 



1875. Productus praitenianus (pars.). AVhite, U. S. Geog. Geol. Surv. W. 100th Mer., Rept., vol. 4, 



p. 113. (Entire volume published in 1877.) 

 Subcarbonif erous : Mountain Spring, Lincoln County, Nev., and below Ophir City, Utah. 

 1877. Productus Ixvicoslusf Hall and Whittield, U. S. Geol. Expl. 40th Par., Eept., vol. 4, p. 266, 

 pi. 5, figs. 7, 8. 

 Lower Carboniferous limestone: North of Snowstorm Hill, Dry Canyon, Oquirrh Mountains, Utah. 

 (?) 1887. Productus s^)."! compsire prattenianus. Hall and Clarke, Pal. New York, vol. 8, pt. 1, pi. 18, 

 fig. 4. 

 Waverly sandstone: Newark, Ohio. 

 1895. Productus Ixricostus. Keyes, Missouri Geol. Surv., vol. 5, p. 41, pi. 38, fig. 1. (Date of imprint 

 1894.) 

 Kinderhook group: Louisiana, Mo. 

 Burlington group: Louisiana, Mo. 



1899. Productus Isevicosta. Girty, U. S. Geol. Surv., Mon., vol. 32, pt. 2, p. 534, pi. 69, figs. 9a-9c. 

 Madison limestone: Yellowstone National Park. 



1900. Productus Ixiicosta. Weller, Acad. Sci. St. Louis, Trans., vol. 10, p. 71, pi. 1, figs. 1, 2 

 Chonopectus sandstone: Burlington, Iowa. 



