300 "TERRA NOVA" EXPEDITION. 



Remarks.— This species is easily distinguished by its exceedingly long and narrow 

 scale, by the large number of joints in tlie tarsus of the thoracic limbs, and by the 

 form and armature of the telson. 



Teibe MYSINI. 

 Genus ANTARCTOMYSIS, Couticre, 1906. 



22. Antarctomysis maxima (Hansen, MS.), (Holt & Tattersall). 



Mysis maxima, Holt & Tattersall, 1906, ]}. 11 ; Antarctomysis maxima, Coutiere, 1906, p. 1, 

 pi. 1 and 2, figs. 1-20 ; Tattersall, 1908, p. 36, pi. VIII, fig. 1 ; Hansen, 1908, p. 13, pi. II, 

 figs. 3a-m; Hansen, 1913, p. 19; Tattersall, 1913, p. 872; Zimmer, 1915 (1), p. 203, 

 text figs. 1-2 ; Tattersall, 1918, p. 12. 



Occurrence. — Antarctic. Station 194, one female, 50 mm. ; Station 316, one female, 

 42 mm. ; Station 339, one adult male, 45 mm., two females (posterior ends only) ; 

 Station 355, one male. 



Distribution. — Circumpolar in Antarctic Seas. 



23. Antarctomysis ohlinii, Hansen. 



Antarctomysis, sp., Tattersall, 1908, p. 36, pi. VIII, figs. 2-12 ; A. ohlinii, Hansen, 1908, p. 13 ; 

 Hansen, 1913, p. 20, pi. Ill, figs. 2a-d. 



Occurrence. — Antarctic. Station 332, one male, 58 mm., one female carrying 

 eggs, 71 mm., one immature female, 52 mm., one young, 24 mm. ; Station 343, three 

 young, 10-12 mm. ; Station 346, one young, 10 mm. ; Station 355, one female, 50 mm. 



Remarks. — The largest of these specimens is of much greater length than any 

 of those examined by Hansen. The latter had adult females 50 mm. long, and his 

 largest male measured 52 . 5 mm. The female of 52 mm. in the present collection has 

 the incubatory lamellae only just developing, while the one with eggs in the brood 

 pouch is 71 mm. long. Hansen has remarked that A. maxima appears to grow to a 

 larger size in more southerly and therefore colder latitudes. The same would seem 

 to apply to A. ohlinii, since Hansen's specimens were from latitude 54° S., while the 

 "Terra Nova" collected it at least 23° further south. 



Distribution. — Previously recorded by the " Discovery " and by the Swedish 

 Antarctic Expedition only. 



