SEA LILIES, STARFISHES, ETC.- — CLARK. 95 



Japanese and Tasmanian forms under the same name. The 

 New Zealand species, P. cylindrica, is undoubtedly a very 

 near relation but seems to be a smaller form, with arm spines 

 and arm plates somewhat different. Lyman's P. arenosa from 

 Bass Strait and Bell's P. assimilis from Port Jackson seem 

 to be quite distinct, but it must be granted that the five 

 species form a very homogeneous group. 



The " Endeavour " specimens show^ plainly that in P. 

 dyscrita at least the relative as well as the actual arm-length 

 increases markedly with age ; in the smallest specimen the 

 disk-diameter (D) is 10 mm., the arm length (A) 40 mm., and 

 hence A=4D, while in another D = 12, A=60, D=5A, and 

 in the largest specimen, D=20, A =140, D = 7A. There is 

 some diversity in colour indicated ; the arms are often 

 banded with brownish, or dirty whitish, and in one case there 

 are 5 or 6 transverse bands, dorsally, of rose-purple. The 

 colour in life is probably white, dull yeUow, or pale brown, 

 with rose-purple markings, spots or bands. Fourteen speci- 

 mens. 



Locs. — North-east of Cape PiUar, Tasmania, 80 fathoms. 



East of Maria Island, Tasmania, 78-128 fathoms. 



East of Babel Island, Bass Strait, 65-70 fathoms. 



East of Flinders Island, Bass Strait, 80-300 fathoms. 



Off Gabo Island, Victoria, 200 fathoms. 



FamHy OPHIOCHITONID^. 

 Genus Ophionereis, Liitken. 

 Ophionereis schayeri (Muller and Troschel). 



Ophiolepis schayeri, Miiller and Troschel, Arch. f. Naturg., 



x.i., 1844, p. 182. 

 Ophionereis schayeri, Liitken, Add. ad Hist. Oph., pt. 2, 



1859, p. 110. 

 This is a very small specimen, only 4.5 mm. across the disk, 

 but it is not otherwise notable. 



Loc. — Between Devonport and Launceston, Tasmania. 



ECHINOIDEA. 



The collection of Sea-urchins made by the "Endeavour" 

 strengthens the evidence in support of the opinion formed 

 by study of the "Thetis" collection, that Echini are relatively 

 unusually common in the waters of Southern Australia. 

 Considering the fact that there are rather more than one 



