226 Messrs. R. Etheridge, Jun., and P. H. Carpenter on 



group, or Upper Devonian of Missouri. We are informed, 

 however, by Mr. S. A. Miller, of Cincinnati, that this species 

 really belongs to the Kinderhook group (Marshall group of 

 Winchell) in the lower portion of the Subcarboniferous series ; 

 and also that Schizoblastus missouriensis , Shurn. sp., which 

 we quoted as Devonian, really belongs either to the Warsaw 

 or to the Kaskaskia group of the Subcarboniferous. 



It likewise appears that the existence of the Spanish Pen- 

 tremitidea Paillettei in the Devonian rocks of America must 

 be regarded for the present as extremely uncertain. Mr. 

 Wachsmuth informs us that the specimen in his collection 

 which we referred to this type * was obtained by him from a 

 dealer, who gave its locality as Charleston, Indiana. But 

 none of the local collectors have ever met with a similar one; 

 and it is therefore very far from certain that the species does 

 occur in America, where no other European Blastoids have 

 yet been found. We have been pleased to discover, how- 

 ever, that the Eifel species Pentrernitidea clavata, Schultze, 

 also occurs in the Devonian rocks of the province of Leon, in 

 Spain, where it appears to exhibit the same variability of 

 form as the Eifel specimens do. So far as we know at 

 present, this species has a wider distribution in Europe than 

 any other Blastoid. Examples of it were kindly sent to us 

 by Don Lucas Mallada, to whom w r e are also indebted for the 

 opportunity of describing another species of Pentrernitidea and 

 a very remarkable large Phcenoschisma, together with the 

 first European species of Troostocrinus. 



2. Note on the Ambulacra of Orophocrinus. 



In all the figures of Orophocrinus stelliformis which have 

 hitherto been published, the ambulacra are represented as quite 

 narrow and as separated from the hydrospire-clefts by what 

 appear to be actual portions of the radial and oral plates ; so 

 that these clefts would not be simply the lateral portions oi 

 the radial sinus which are left unfilled by the ambulacra, but 

 actually excavated in the substance of the calyx-plates them- 

 selves. They are described as follows by Messrs. Meek and 

 Worthen f : — u So-called ovarian openings, commencing one 

 on each side near the inner ends of the pseudo-ambulacral or 

 arm areas, and extending outward along the margin of a broad 

 sulcus, and near the edges of these areas, for about half the 

 length of the latter, as very narrow slits, widest at the inner 

 end, where they connect with the inner ends of the internal 



* Loc cit. p. 223. 



t Geological Survey of Illinois, vol. v. p. 466. 



