88 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, 



to find, if possible, some more exceptions to the rule of the presence 

 of four anal plates'; not one, however, was to be found among the 

 fourteen specimens I examined. The localities were : — 



(1) Portland Bay, 10 fathoms; bottom, hard sand. 



(2) Tom Bay, 0-30 fms. ; bottom, rock, kelp, and mud. 



(3) Cockle Cove, 2-32 fms. ; bottom, mud. 



(4) Port Rosario, 2-30 fms. ; bottom, sand and rock. 



(5) Trinidad Channel, 30 fms. ; bottom, sand. 



The smaller specimens varied considerably in colour; the light 

 green of the test and the purplish flesh-colour of the spines of the 

 ordinary specimens being in one case replaced by a light brown for 

 both test and spines ; one or two examples had reddish patches on 

 the bare spaces of the interambulacral areae ; and in two cases the 

 white pedicellarise, placed on a deep-green test, gave a rarely seen 

 appearance to the specimens ; another example had the spines 

 white, with a deep rusty-brown patch in each bare interambulacral 

 space. None of the specimens was of a large size. 



Strongylocentrotusbullatus, n.sp. (Plate VIII. figs. 1, 2.) 



Test rather thick and slightly pentagonal ; superiorly to the 

 ambitus the primary tubercles of the interambulacral arese, which 

 are set in two rows, are of considerable size ; generally eight pairs of 

 pores in each arc, which is set more or less horizontally, and is 

 separated from the one above and below by a not very regular series 

 of small tubercles ; the ambulacral area comparatively narrow ; the 

 actinostome moderately small and very faintly notched ; abactinal 

 system thickly covered with small tubercles ; ocular plates all ex- 

 cluded from the anal system ; madreporic body large ; anal plates 

 large in size and small in number. Test brownish red ; the spines 

 not long, and of a dirty or brownish yellow colour. 



Straits of Magellan. 



The difficult genus Strongylocentrotus stands in need of a careful 

 revision ; and it is necessary that I should point out some of the 

 reasons which induce me to look upon this species as new, though 

 this is by no means the place to undertake any thing like a general 

 review of the group. It seems, then, to be the only species in which 

 all the ocular plates are excluded from the anal system — presenting 

 a considerable resemblance to 8. franciscanus, in so far that the 

 primary tubercles of the interambulacral areae form, in both species, 

 two rows, and are considerably larger than any others on the test ; it 

 is distinguished not only by having the tubercles absolutely smaller, 

 but also by the fact that it is above rather than at the ambitus that 

 the largest tubercles are to be found. So, again, a resemblance is 

 to be seen to 8. albus in the presence of tubercles separating the 



^ P. Z. S. 1879, pt. iii. p. 436. I may here state that during the autumn of 

 1879 1 took the opportunity to examine the few specimens of this genus that are 

 deposited in the Natural-Histoi-y Museum at Brussels ; but I was not able to 

 detect in any of them any indications as to the presence of more than four 

 plates. 



