93 



PAPEBS READ. 



Ox A NEW Species of Stomopneustes and a new Variety of 



HiPPONOE yariegata. 



By the Eey. J. E. Tenison-Wgods, F.G.S., F.L.S., &c. 



[Plates YI. and YII.] 



Hitherto there has been only one species o£ Stomopneustes 

 known, and I formerly believed our Australian species to be 

 identical with it. Under this impression I classifiod the only 

 specimen I had ever seen as Stomopneustes variolaris, Lamark. 

 See Proceedings Linnean Society, N. S. Wales, Vol. 2 (1877-78), 

 p. 156. In Vol. 5 of the same Proceedings I gave my reasons 

 for regarding the species as distinct (see p. 198), and distinguished 

 it by the name of 8. atrapurpurea. I there stated that it is very 

 common on the N. E. coast within the tropics. I now figure the 

 species and give the following diagnosis : — 



Stomopneustes atrapurpurea, n, s., Plate 6. 



Test circular or obscurely pentangular, in large and old 

 specimens eccentric, of a pale brownish pink colour with darker 

 purple stains. Poriferous zone slightly undulating, rather 

 narrow, the inner or third row on each line separated by a line 

 of secondary tubercles. Ambulacral and interambulacral areas 

 thickly covered with primary, secondary, and miliary tubercles, 

 the latter arranged in rings around the primaries. Ambulacral 

 area with two rows of primary tubercles, bordered on each side 

 by a row of secondaries, which alternate in size, being larger 

 ^vhen they are opposite spaces between the primaries, and smaller 

 when they are beside them. In the middle of the area there is a 

 deep undulating groove bordered bj a line of miliaries. This 

 groove is continuous from the anal system to the actinosome. 

 Interambulacral area with two rows of primary tubercles with 

 irregularly scattered secondaries, the primaries heiiig slightly 

 smaller than those of the A. areas. Mammary bosses hemispherical 



