REPORT ON THE ECHINOIDEA. 177 



extent of development of the fascicles in species of the same genus and often in specimens 

 of the same species. 



Hong Kong, outside harbour. 10 fothoms. December 22, 1874. 



Breynia [Echinocardium). 



Breynia, Des., 1847, Agass., C. R. Ann. Sc. Nat., vol. viii. 



See Lovenia suhcarhiata, where I have given an analysis of the affinities of Breynia 

 and Lovenia. 



Breynia australasioe (PI. XXI. figs. 1, 2 ; PI. XXXIX. fig. 14 ; PI. XL. figs. 



47-50). 



Spatnngzi^ australashe, Leacli, 1815, ZooL Misc., vol. ii. p. 68. 

 Breynia australasice. Gray, 1855, Cat. Rec. Ech. 



As in Eupatagus the abactinal side of the test is covered with secondary spines of 

 uniform size and of a light chocolate colour, with a silvery lustre in alcohol, with a few 

 large curved primary spines of a lighter colour in the interambulacral abactinal region of 

 the test, near the peripetalous fasciole. The spines increase in size towards the ambitus, 

 and on the actinal side become longer ; they are curved towards the bare ambulacral 

 zones both in the lateral interambulacral areas, and in the actinal plastron. In alcohol 

 the colour of the spines of the actin^d surface is much lighter than on the abactinal side ; 

 the large spines being of a light yellowish tint with a silvery white lustre. 



Torres Straits. August 7, 1874. 



Brissina. 



Sub-family Brissina, Gray, 1855, Cat. Rec. Ech. 

 Hemia^ter. 



Eemiaster, Des., 1847, Agassiz, C. R. Ann. Sc Nat., vol. vii. 



Hemiaster cavernosus (Pis. XX.% XXXIX. fig. 15; PL XLI. figs. 21, 22). 



Tripylus cavernosun, Phil., 1845, Wieg. Archiv, p. 347. 



Hemiaster cavernosun, A. Agassiz, 1872, Re vis. Ech., part 1, p. 132. 



In a large specimen of Hemiaster cavernosus no trace of a distinct anal fasciole could 

 be detected ; there existed, it is true, an accumulation of smaller tubercles aU round the 

 anal extremity. In a small specimen, however, measuring only one-third of an inch, there 

 was a distinct anal fasciole joined to a very broad, well-marked lateral fasciole, while in 

 another specimen measuring half an inch the subanal fasciole consisted only of a short arc 

 without any trace of the lateral fasciole. A similar difference also undoubtedly exists in 



(zOOL, CHALL. EXP. — PAKT IX. 1881) I 23 



