ECHINODERMATA — CLARK. 551 



One specimen from Station 44. Off Coogee, 49-50 fathoms ; fine 

 -sand. 



One specimen from Station (1) 



The largest of these specimens has the disc about 25 mm. in 



•diameter; the colour is dirty whitish, prettily but irregularly 



spotted with jmrplish-brown. This speciuien raised the question 



-in my mind whether it wex-e not really conspecific with Verrill's'^^ 



^stropliyton australe. Although smaller than Verrill's type, and 



with ditierent proportions and colouration, in some respects it 



answers well to his description; the conspicuous wedges of wliich 



the disc is made up, and to which Verrill makes no reference, 



and the apparent absence of radial shields and interradial 



.areas, to both of which Yerrill refers, made it seem impossible, 



however, that the two could be identical. Thanks to the 



kindness of Mr. Henry Y. Pelton, who has sent me from 



Poughkeepsie, one of Verrill's originals, I have been able to settle 



the question in the negative ; though nearly related, the two 



.-are not even congeneric. Verrill's species seems to be a true 



■Gorgonoceplialus, with distinct radial shields, well separated from 



■ each other, and well-marked interradial areas. The tubercles on 



the arms are very much smaller than those on the radial shields, 



.and the line of separation between the disc and arms is obvious. 



In spite of these differences, however, no one who compares the 



specimens will question that Conocladus has been derived from 



.an ancestral form, strikingly like Gorgonocephalus australe. 



ECHINOIDEA. 



Although the 243 Echini in the collection represent fifteen 

 •species, the great bulk of the collection, 174 specimens, belongs 

 to only two. One of these two, however, proves to bs a most 

 interesting new species of Fihidaria, remarkable for the brooding 

 of the 5'oung by the female, and the consequent striking differ- 

 ence between the sexes. Of the other thirteen species, one 

 appears to be a new species of Chcetodiadema, a genus first estab- 

 lished in 1900, but of which this is the third species discovered 

 since the type-species was described. There are a number of 

 specimens of an Echinocyamus, first collected by the " Siboga," 

 and a dozen of the recently-described Asihenosonia thetidis,}i.'L.C. 

 A single beautiful specimen of Stephanocidaris hispinosa, Lamk., 

 is one of the great prizes of the collection. The remaining ten 

 species ax'e all well known, and all have been previously recorded 

 from Australia. It is remarkable that there is no Spatangoid in 

 the collection, except a single specimen of Breytda from Lord 

 Howe Island. 



32 Verrill— Bull. U.S. Nat. Mus., No. 3, 1876, p. 74. 



