194 



"TERRA NOVA" EXPEDITION. 



Neoarcturus oudops, Barnard, from the Cape. A study of Barnard's figures will make it 

 clear that he has really seen a similar modification to that which I have just described. 

 Moreover, the same modification was found by Ohlin in his species, Pseudidothea 

 honnieri. 



The second type of first male pleopod I found in a single species, Pseudarcturella 

 chiltoni, from New Zealand, and it is represented diagrammatically in text-fig. 1, B. 

 Here, instead of a groove on the underside of the exopodite, the latter bears an 

 additional lobe on the inside. This lobe is swollen at the base, narrow and pointed at 

 the tip, and looks like the appendix masculina of the second pair of pleopods. At the 

 tip are several transverse thickenings of the chitin. The specialisation of the first pair 

 of pleopods of the males as accessory copulatory organs is not known, as far as I am 

 aware, in Marine Isopoda, otherwise than in the tribe Valvifera, and its widespread 

 occurrence in that tribe seems worthy of special emphasis. 



My thanks are due to the authorities of the British Museum for entrusting this 

 collection to me for examination and report, and especially to Dr. Caiman for the 

 valuable help, always willingly given, which he has rendered me with literature, and 

 the facilities he has given me for the examination of specimens in the National 

 Collection. 



I am especially indebted to my wife for the beautiful drawings which illustrate 

 this report. 



II.-LIST OF SPECIES.* 



Order TANAIDACEA. 

 Family TANAIDAE. 



Nototanais dimorphus (Beddard). 

 Tanais gracilis, Heller (?). 

 Tanais novae- zealandiae, G. M. 

 Thomson (?). 



Order ISOPODA. 

 Sub-order ASELLOTA. 

 Family PARASELLIDAE. 



Geoup JANIRINI. 



Janira longicauda, Chilton. 

 lanthopsis sp. (?). 

 Notasellus sarsi, Pfeffer. 

 Edias turqueti, Richardson. 



Geoup MUNNINI. 



Coulviannia frigida, Hodgson. 

 Munna iiiacidata, Beddard (?). 

 Haliacris antarctica, Pfefi"er. 



SuB-ORBER FLABELLIFERA. 

 Family CYMOTHOIDAE. 



Cirolana intermedia, VanhofFen. 

 ,, ohtusata, Vanhoff'en. 

 ,, pellucida, u. sp. 

 ,, canaliculata, n. sp. 

 ,, japonica, Hansen. 

 . Eurydice suhtruncata, n. sp. 

 Aega antarctica, Richardson. 

 ,, glacialis, n. sp. 

 ,, novi-zealandiae, Dana. 



* The classification and arrangement of species followed in this report is that of Hansen, in his 

 account of the Tanaidacea and Isopoda of the " Ingolf " Expedition (Hansen, 1913 and 1916). 



