741 



THE RECENT CRINOIDS OF AUSTRALIA CLAKK. 697 



must be placed with Comactinia and Cominia, and that, in spite 

 of its compound division when more than ten arms are present, 

 it cannot be at all closely related to Comatella. 



The occurrence of compound division both in Comatula and 

 Comatella is comparable to the occurrence of interpolated division 

 series consisting of two segments each in such different groups as 

 the Pontiometridfe, Stephanometridse, and Mariametridse among 

 the Comatulids and in Endoxocrinus among the Pentacrinites, 

 and of extraneous division of the same type in the Comatulid 

 genus Cajnllaster and the Pentacrinite genus Hypalocrinus. 



Additional Australian Records. — Professor J. Bete Jukes found 

 this species abundant on the Nortli-east Coast of Australia ; the 

 "Alert" dredged it at AUiany Island, in 3-4 fathoms, at Thursday 

 Island, and in the Prince of Wales Channel, in 7 fathoms, and in 

 5-7 fathoms, as well as in Torres Strait, in 4 fathoms ; Professor 

 F. J. Bell has reported it from Port Molle, and the " Challenger " 

 found it between Albany and Somerset Islands, off Booby Island 

 (10° 36' S. lat,, 14'' 55' E. long.), in 6 fathoms, as well as at Cape 

 York and the Aru Islands south of the western end of New 

 Guinea. There are some specimens in the British Museum froni 

 Holothuria Bank, 34 fatiioms. 



Range. — The Aru Islands and the Northern Coast of Australia, 

 south in Queensland to Port Molle. 



Remarks. — Basing my conclusions upon the data and the 

 figures given by P. H. Carpenter in the '-Challenger" Report, 

 I have previously used the name rotalaria for the species called 

 by 'hlxkWev Alecto parvicirra; I was therefore somewhat surprised, 

 when studying the collections of tlie Paris Museum, to find that 

 Lamarck's original material consisted of two beautiful specimens 

 of the foiun called jukesii by Cai'penter and paucicirra by Bell, 

 a very different thing from the rotalaria of the "Challenger" 

 Report. 



COMATULA ETHERIDGEI,sp.wov. 



Deseript'toyi. — In general resembling C pectinata ; there are 

 no cirri, but the centrodorsal is somewhat raised above the dorsal 

 surface of the radial pentagon. 



Pj is replaced on each arm by two brachials terminating in 

 an axillary (morphologically an exteriorly developed IIBr 

 series) from which springs interiorly [i.e., on the side toward the 

 original arm) a small arm tvvo-tliirds the length of a normal Pj, 

 and externally a normal F^. 



In the type specimen the small supernumerary arn)s are usually 

 about two thirds the length of the normal P^, but tliey may be 

 as long as three-fourths of the length of that pinnule; another 



