SCHIZOPODA, STOMATOPODA, AND NON-ANTARCTIC ISOPODA. 867 



part of the Antarctic Ocean, but I am not aware that any account of the Schizopods 

 has yet been published. 



The above table includes seventeen species of Schizopoda — a complete list of the 

 known purely Antarctic forms, as far as I am aware. (See note, p. 894.) 



Of these seventeen, three are more or less circumpolar — Euphausia superha, 

 Thysanoessa macrura, and Antarctomysis maxima — having been recorded from the 

 collections of most of the recent expeditions. Of the remainder, the following species, 

 captured by the Discovery and the Swedish Expedition at almost opposite sides of the 

 South Polar Ocean, will probably be found ultimately to be circumpolar in their 

 distribution, viz. : — 



Euphausia triacantha. 

 ,, frigida. 

 „ crystallorophias. 



,, Vallentini. 



Thysanoessa vicina. 

 Hansenomysis antarctica. 

 Antarctomysis Ohlinii, 

 Pseudomma Belgicse. 



Eucopia australis, captured by the Scotia and the Swedish Expedition, was not 

 taken by the Discovery ; but the type locality is quite near to Victoria Land, and the 

 species is in all probability circumpolar. This gives a total of twelve species, out of 

 seventeen known from the Antarctic Ocean, with a circumpolar distribution in that 

 ocean, leaving only five whose present known distribution is limited. 



The Schizopoda, therefore, present very clear evidence of a group which is, as a 

 whole, circumpolar in its distribution in Antarctic waters. 



The Scotia discovered only one new species, Boreomysis Brucei. 



The Isopoda entrusted to me for identification include those taken by the Scotia 

 on the outward and homeward journeys, mainly at the Falkland Islands and at the 

 Cape, together with three species of parasitic Isopoda found on pelagic Decapoda and 

 Schizopoda captured in tow-nets in the open ocean. The collection as a whole calls for 

 very little comment, the recent work of Stebbing on the Crustacea of the Falkland 

 Islands and South Africa covering nearly all the ground. In common with most workers 

 called upon to identify isolated specimens of Sphseromidse from distant localities, I 

 have experienced considerable difiiculty with this group. I have been obliged, as a 

 result of my work, to establish two new species, which I hope will not add to the state 

 of chaos in which the group remains at present. Dr Bruce was also fortunate in re- 

 discovering Exosphseroma trisiense, of Leach, a species which has remained in obscurity 

 since its discovery nearly a century ago. I have redescribed the species, and figured, for 

 the first time, the adult male. A third new species among the Isopoda is established 

 for a specimen of the family Arcturidae found at the Cape, which appears to be very 

 distinct from any hitherto known form. 



