SEA LILIES, STAEFISHES, ETC. CLARK. 105 



Off Babel Island, Bass Strait, 50-60 fathoms. 



Oyster Bay, Tasmania, 30 fathoms. 



Twenty-four miles south-south-east of Eagles Nest Rock, 

 Victoria, 15 fathoms. 



Forty miles west of Kingston, South Australia, 30 fathoms. 



Off Cape Marsden, Kangaroo Island, South AustraHa, 17 

 fathoms. 



South of St. Francis Island, South Australia, 35 fathoms- 



Genus Histocidaris, Moriensen. 



HiSTOCiDARis ELEGANS [A. Agassiz). 



Porocidaris elegans, A. Agassiz, Proc. Amer. Acad., xiv., 

 1879, p. 198. 



Histocidaris elegans, Mortensen, " Ingolf " Ech., pt. 1, 

 1903, p. 22. 



This is an interesting quartette, each one having some point 

 of special interest. The smallest is 20 mm. in horizontal 

 diameter (h.d.) and 12 in vertical (v.d.) ; there are only 6 

 coronal plates in each series ; the primary spines are 50-58 

 mm. long, and while finely spiny have no coarse thorns ; 

 the test, secondaries and collar of the white primaries are dull, 

 deep gray-purple. The next specimen is 38 mm. h.d. and 

 25 v.d. ; there are 7 or 8 coronal plates; the primary spines 

 are wonderfully fine, 100-130 mm. long, 3 mm. thick, and 

 very thorny near base, becoming finely spiny near tip ; the 

 colour is like that of the small specimen. The third specimen 

 is remarkable for the size and shape of the test and the 

 number of coronal plates ; h.d. = 71 mm., and v.d. = 61, so 

 that the height is .85 of h.d. ; there are 12 coronal plates and 

 excessive number for a recent cidarid ; the primary spines 

 are all broken or missing (except actinally), but it is evident 

 that none were thorny ; the test is deep yellow-browTi, the 

 secondaries, pedicellariae, etc., dirty whitish ; the general 

 condition of the specimen is poor though the test is perfectly 

 whole. The fourth specimen is remarkable only because of 

 its large size, h.d. = 78 mm., and v.d. =58; v.d. = .75 h.d. ; there 

 are 10 or 11 coronal plates ; the primary spines are as a rule 

 broken, but a number are whole, all are coarsely thorny and 

 the longest probably exceeded 100 mm. It would seem that 

 in this species, as in the preceding species of Goniocidaris, the 

 primary spines reach their full length, 100-130 mm. when the 

 test is about half grown, and that subsequent changes are 



