TANAIDACEA AND ISOPODA— TATTERSALL. 205 



zelanica, which he reluctantly refers to Haliacris, is inclined to share Hodgson's opinion. 

 Miss Eichardson (1913), however, suggests that the genera Munna and Haliacris 

 should be kept separate, on the ground of the sexual differences in the second thoracic 

 limbs. The genus Munna is well known from Northern waters, but no such form of 

 sexual dimorphism is known in Northern species. Much, however, still remains to be 

 done among the Southern species. Most of them have been described from one or 

 two specimens, and the occurrence of marked sexual dimorphism may in reahty be 

 much more widely spread than appears at present. The facts emphasise the importance 

 of having a full range of specimens before describing new forms. For the present 

 I accept Miss Richardson's suggestion to keep Munna and Haliacris distinct, the 

 latter, so far as present knowledge goes, including only two species, //. antarctica, 

 Pfeffer, and H neo- zelanica, Chilton, with possibly a third in //. australis, Hodgson. 



Sub-order FLABELLIFERA. 



Family CYMOTHOIDAE. 

 Sub-family CIROLANINAE. 



Genus CIROLANA, Leach. 



11. Cirolana intermedia, VanhofFen. 



G. intermedia, Vanhoffen, 1914, p. 500, text-fig. 37. 

 Occurrence. — Station .316, off Glacier Tongue, about 8 miles N. of Hut Point, 

 McMurdo Sound, 190-250 fathoms, bottom fauna, one male, 25 mm. 



Remarks. — In his report on the Isopoda of the German South Polar Expedition, 

 Vanhoffen (1914) described four species of giant Cirolana which had been found in 

 great abundance at the winter quarters of the " Gauss." Two of these species are 

 represented in the " Terra Nova " collection by one and two specimens respectively. 

 Fortunately all three specimens are males, and by the aid of Vanhoffen's figures can be 

 referred easily and without doubt to their correct species. C. intermedia may be 

 distinguished from the following species, C. obtusata, by its smaller eye with pale 

 pigment, its relatively longer antenna (which in the single specimen measured 11 mm.), 

 by the long penial filaments on the sternum of the last thoracic somite in the male, and 

 by the strongly curved appendix masculina on the second pleopod of the male. Both 

 species belong to Hansen's " Sectio prima " of the genus Cirolana, and have the 

 epistome (labrum and frontal lamina and clypeus) of the same form as C. borealis and 

 C. hirtijyes. 



12. Cirolana obtusata, Vanhoffen. 



G. obtusata, Vanhoffen, 1914, p. 496, text-fig. 34. 



Occurrence.— ^tsiiion 194, off Gates Land, 69° 43' S., 163° 24' E., 180-200 fathoms, 

 bottom fauna, two males, 25 and 28 mm. 



