246 RECORD OF SCIENCE FOR 1886. 



Etheridge, Egbert, Jr., and P. Herbert Carperter — Coutiaued. 



Order Regulares, E. and C, 188G. 



(1) F a.mi\y roifremilidie, D'Ofbigny, ISo'i (Eaieiid. E. & C, 1886). 



(2) Family Troostoblasiidw, E. & C, 1886. 

 (.3) Family Nudeohlastidcv, E. & C, 1886. 



I. Subfamily Elaacrinida', E. & C, 1886, 



II. Subfamily Schizohlastoida', E. & C, 1886. 



(4) Family Granatohlastidcc, E. & C, 1883. 



(5) Family Codasteridw, E. & C, 1836. 



I. 8\ibfsiuiily PhainoschismidWf'E. &, C, 1886. 



II. Subfamily Cryptoschismid(e, E. & C, 1886. 

 Order Irregiilares, E. ifc C, 1886. 



(6) Family Astrocrinitidw, T. & T. Austin, 1843 (Emend. E. & C, 1886). 



I. Basals nu.syrametrical. 



II. Basals symmetrical ; odd ambalacrum linear. 



The following is au attempt .at an abstract of the work on American forms : 

 Regulares, E. & C, 1886. 



rentremilidw, D'Orbigny, 1832 (Eraeud. E. & C, 1886). 



Fentrcmiics, Say, 1820 (Eraeud. E. & C, 1886), type. 



Encrina Godoni, Do France. This genus as restricted is essentially Carbonif- 

 erous and strictly American, with one possible exception, P, oralis, 

 Goldfuss. 



r. Godoni, var. major, var. nov. 



Peniremitidw, D'Orbigny, 1849 (Emend. E. & C, 1882). Type Peniremiles 

 Prt?/e<</, de Verneuil. This genus is limited to the Devonian Period, and 

 in America to the Hamilton Group, which contains at least two, and per- 

 haps six, species. 



MesoMasius,* gen. nov. Type Pcntremiiis crcnuJalus, Roemcr. This is essen- 

 tially a Carboniferous genus, and occurs on both sides of the Atlantic. 

 The autbors'think it probable that Granatocriniis (jJaher, M. & W., should 

 be referred to this group, and also some other American species, hitherto 

 described under Granatocriniis. 



Troostoblastidae, E. & C, 1886. 



Troostocrinus, F. B. Shumard, 1865 (Emend. E. & C, 1886). 



Typo Peiitremiies Peinicardtii, Troost. The type species is characteristic of the 

 Niagara Period of America. No Devonian species are known, but if, as 

 the authors suspect, P. Grosvenori, Shumard, be referable to this genus, it 

 reappeared in the upper strata of the American Carboniferous limestone. 



Metahlastus, gen. nov. Type Pcnirtmitcs lineains, Shumard. The authors refer 

 doubtfully to this genus, Peniremiles suhcyUndricnSf'RaW, and Codasier 2>cnia- 

 lobus, Hall, from the Niagara group ; most of the forms are fiom the 

 American Carboniferous system. The type series occurs in the Upper 

 Burlington limestone, two are found in the Keokuk and two more in the 

 Warsaw limestone, though none are known in the Kaskaskia limestone, so 

 rich in Pentrcmiies. 



Tricadocrinus, Meek & Worthen, 1868. Type Peniremiles TVoodmani, Meek & 

 Worthen. This is an essentially Carboniferous type, and, so far as we at 

 present know, it is limited to the Keokuk and St. Louis groups of the 

 American Carboniferous system ; four species are known, though it is 

 probable that two of them are identical. Triccelocrinus Meelcianus, sp. 

 nov., Warsaw limestone, Spurgen Hill, Indiana. 



micJcohlasiidw, E. & C, 1886. 



I. Subfamily Elceocrinidce, E. & C, 1886. 



* Mtffof, intermediate. 



