254 On British Fossil Or in aids. 



clausus. Call it tlicu be denied tliat the Timor ecliiuoderms 

 are clearly of Carl)oniferous age? One would even sujipose 

 tliem to lie Lower or at least Middle Carboiiifeious. Other 

 constituents of the fauna are said to be Artinskian, and 

 therefore Permian; but after all, what is '^^ Artinskiau " ? 

 I do not propose to attempt an answer to that question, but 

 I iusist that no answer will be satisfactory which fails to 

 recognize the markedly Carboniferous character of the 

 Echinoderm elements of the fauna. 



Summary. 



SyCocrinns T. & T. Austin, 1843, is discussed on the 

 evidence of the Austins' published definitions, unpublished 

 figures, jNIS, list, and one specimen of S. anapcptamcnus iu 

 the Austin Collection at the Liverpool Museum. 



All the s[)ecies came from the Visean Dibanopliyllum zone, 

 of Settle, Yorkshire. 



S. anapeptamenus is fixed as genotype, and Si/cocrinus re- 

 diagnosed as a Taxocrinid, including also ^' Hi/poc7'inus" 

 innfurmis Rothpletz. Its peculiarities are probably due to 

 a reef-habitat. 



IS. clausus may be an independent species of Sycocrinas, 

 or may be a Hijpocriiius ; but in tlie absence of any known 

 specimen, its precise generic position remains uncertain. 



S. jacksoni is, like Layeniocrinus seminaluiUj probably the 

 young of a Symhathocriaus. 



The occurrence of ISi/cocrinus, Cydonocrinus, and possibly 

 Hypocrinus, in both England and Timor, confirms the 

 Qutlun-'s ])reviously cx|)ressed views as to the Carboniferous 

 age of the Timor fossil Echinoderms. 



EXPLANATION OF PLATE X. 



Piij. ]. Sycocrimis ancqieptamciius Austin: thruo views of the lecto- 

 liolotype, X 4 diaai., drawn by A. IL tSearle * under the 

 Author's dir(!ction. 



Fiij. 1 «. Posterior aspect. 



/•V//. 1 b. Oral as])uct; the outlines of the destroyed plates arc doited iu. 



Fiij. 1 c. Proiii tlie left antt:rior iuterradius. 



Fi'j. 1 iL Imaginary reconstruction of the animal, from the riglit posterior 

 interradius, X 2 diam. F. A. 15. 



* Many naturalists, and not least those occupied with fossil echino- 

 derms, will regret the sudden death of .Artiiur Uodson Searle, wliich 

 occurred on thi' first day of tliis year. It lias often been my pleasure to 

 record niv indebtedness to his care, intelligence, and skill. 



