Gtohujicid Society. ."i j ;, 



University Collection :i\v\ llin-o in tlic Kiitisli Mu-.euui; all lliu 

 f>I)eriini.'ns c-omt* from I lie Carbon itV-rons Limestone. Tlie arms and 

 stem are at present nnknown. Tlie genus in general eharaeter ami 

 Btructiire recalls I'lutycrinug, but tlie incorporation of tbe costal 

 and disticbal pl.ites in the calyx affords a very obvious distinction. 

 The analysis of tlie calyx, however, suggests I lie Meli^crinidie, from 

 the members of which it is cliiefly distinguished by the comjiaratively 

 small size of the costal and di>tichal plates. The new genus is a 

 truly annectant form uniting the Melocrinidie and the I'latycrinidte, 

 ami may be indiflerently associated with either. 



The second genus and species are founded on a specimen in the 

 Orindrod Collection, obtained probably from the Silurian rocks, but 

 from a locality not known, possibly Dudley. In general appearance 

 it resembles an elongated form of FisurrinKS, particularly in its 

 calyx, but the arms are those of a Ileterocrinid. This conjunction 

 of characters, though rendering necessary a revision of the definition 

 of the riflocrinidie, cannot be regarded as bringing this family 

 appreciably ne:irer to the Ileterocrinidie, which are tistulate, while 

 the Pisocrinidue, so far as known, are not. 



2. 'Fossils in the University Museum, Oxford: III. — A New 

 "Worm-track from the Slates of Bray Head, Ireland, with Observa- 

 tions on the genus OlilhiDnla.'' liy W. J. Sollas, M.A., D.Sc, LL.D., 

 F.R.S., V.r.(J.S., Professor of (icology in the University of Oxford. 



The curious markings known as Ohfhaniid have not been hitherto 

 recorded from other than tlie Lower Palaeozoic rocks, althougli they 

 have a wide distribution in sjiace, being found in Ireland, in the 

 Ardennes, in lirabant, in America, and possibly in Norway. While 

 the organic nature of Ohihamia was scarcely a matter of doubt in 

 the minds of the earlier writers, there existed a great diversity of 

 opinion as to its place in the organic world, and it was placed 

 by diflereiit observers among polyzoa, hydrozoa, and plants, respec- 

 tively. The microscopical observations made by the Author prove 

 that Oldhitm'ui is not the remains of an organism, but merely a 

 marking in the rock, though one which might be, nevertheless, of 

 organic origin. Certain markings formed in the mud at Portisbend, 

 by the feeding-habits of a small burrowing crustacean, bear a con- 

 siderable resemblance to specimens of OhUuniiia ; but a stronger 

 resemblance to the new species described in this paper is found in 

 Nathorst's figures of the impressions made by one of the two recent 

 worms Gl'/c<ni uVxt or (lonidia viaadata. Prof. Joly's observation 

 that markings of (Jl<lliauiia antifjua always occur in relief, while 

 those of 0. mdiafii are depressions, might suggest that while one 

 set of markings was i)roduced by the animal when feeding, the other 

 was connected with its castings of excrementitious matter. This 

 explanation is open, however, to several objections, and the Author 

 is inclined to believe that these species of (Jldhiimia are the traces 



Ann. cO Mat/. X. I lift. Scr. 7. Vol. v. iii 



