DESCRIPTIONS OF Till' SPECIES. 283 



it. It was named by d'Archiac and de Verneuil in honour of M. D. G. Schulz, 

 Inspector-General of Mines in Spain, and the autlior of a very elaborate work, 

 ' Descripcione geologica de Asturias' 1 . We follow Don Lucas Mallada 2 in our 

 method of writing the name of this fossil, rather than any other authors who have 

 dealt with it, though we prefer to write Schulzi and not Schulzii. M. Schulz has 

 given a good account of the beds from which the Spanish Pentremitidece come, 

 especially the Ferrones Limestone :! . 



Localities and Horizon. Sabero, Province of Leon, Spain : Calcaire d'Arnao, Lower 

 Devonian. [It is also recorded from the Calcaire de Ferrones of the Asturias by 

 d'Archiac and de Verneuil, and by Barrois 4 .] 



Genus OROPHOCRINUS, von Seebach, 1864. 

 Mitra (pars), Cumberland (uon Laink.), Reliquhc Conscrvatpc, 1826, p. 31. 

 Pentatremaiites Truncati(paxs) , Roemer, Archiv f. Naturgesch. 1851, Jahrg. xvii.Bd. i.p. 368. 

 Dimo/phicrinus, d'Orbiguy, Prodr. Pal. Strat. 1819, i. p. 155. 



Dimorphicrinus, d'Orbiguy, Cours element. Pal. et Geol. Strat. 1852, torn. ii. fasc. 1. p. 140. 

 Orophocrinus, von Seebacb, Nachr. k. Gesellscb. Wissensch. Gottiugen, 1864, p. 110. 

 Codonites, Meek and Worthen, Proc. Acad. Nat. Sci. Philad. 1869, p. 84 (note). 

 Codonites, Meek and Worthen, Report Geol. Survey Illinois, 1873, vol. v. p. 463. 

 Orophocrinus, Zittel, Haudb. Pal. 1879, Bd. i. Lief. 3. p. 434. 

 Orophocrinus, E. & C, Ann. & Mag. Nat. Hist. 1882, vol. ix. p. 219, 1883, vol. xi. p. 226. 



Gen. Char. Calyx balloon- or parachute-shaped, or truncate ob-pvramidal, longer 

 than wide ; attenuate and elongated below, expanding upwards from the base to the 

 radial lips, which always form the periphery ; section distinctly pentagonal as a 

 rule ; summit more or less convex. Basal plates forming a low but well-defined cup. 

 Radial plates usually oblong in form, with projecting lips ; sinuses narrow, sometimes 

 slightly petaloid or nearly parallel-sided. Deltoid plates more or less spearhead- 

 shaped, and constricted in the middle, generally visible in side view, the anal deltoid 

 wider than the others and usually deeply excavated. Ambulacra narrow, linear to 

 subpetaloid. Side plates large, their apposed edges excavated for the pinnule- 

 sockets. Spiracles ten, varying from wide clefts extending along the sides of the 

 ambulacra to narrow slits at their proximal ends ; the posterior pair separate from 

 the anus. Hydrospire-slits mostly concentrated at the bottom of the radial sinuses. 

 Column of low and rounded or slightly pentagonal joints. 



History. The name Orophocrinus was proposed in 1SG4 by von Seebach for the 

 peculiar species Pentremites steUifonnis, Owen and Shumard. In justice to American 

 authors it must, however, be stated that Dr. B. F. Shumard, when referring the 

 same species to the genus Codaster, remarked 5 : — " This fossil in some of its characters 



1 8vo and 4to, Madrid, 1858. 2 Bol. Com. Mapa Geol. Espafia, 1875, tomo ii. p. 79. 



3 Loc. cit. p. 43. 4 Mem. Soc. Gl : o1. du Xord, 1S32, torn. ii. Mem. i. p. 225. 



5 Trans. St. Louis Acad. Sci. 1865, vol. ii. no. 2, p. 385, note. 



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