2 8z DISCOVERY REPORTS 



occurred abundantly in the upper layers, even to quite near the surface, during the 

 day. 



The form thotnsoni, with the apex of the peduncle of the ist uropod not extending 

 to the apex of the peduncle of the 2nd, occurred amongst both compressa and bispinosa, 

 noticeably in nos. 17 and 30 (St. 72 and 239, on the track between the Falkland Islands 

 and Tristan da Cunha). Also at two stations (St. 9 and 239 : between Tristan da Cunha 

 and South Georgia, and north-east of the Falkland Islands) the bispinosa specimens 

 were noticeable for the length of the 6th joint of the 3rd peraeopod and of the 3rd 

 uropods, being exact counterparts of Guerin's figure and Dana's figure of antarctica 

 (cf. facsimiles in Bovallius, 1889, pp. 299 and 294 resp.). 



As regards the synonymy it seems that the union of gandichaudii, antarctica, thomsoni, 

 compressa and bispinosa under the one name is undoubtedly right. Vosseler stated that 

 the name gandichaudii should be used, but Stephensen ignores Guerin's right of 

 priority. Strictly speaking bispinosa should give place to antarctica as a designation 

 for one of the two forms. Perhaps this latter is too drastic a change for northern 

 naturalists ; certainly the use of a geographical appellation is not very desirable, though 

 the terms compressa and bispinosa do not express the real contrast between the two forms. 



Distribution. North Atlantic about 40°-76° N (the Plankton Expedition obtained 

 one compressa at 7 S and one bispinosa at 31^° N) ; South Atlantic, 35°-68° S ; southern 

 Indian Ocean, 40°-50° S; Australasian Region, 48°-63° S. The occurrence in lower 

 latitudes off Cape Town (34 S) is evidently due to the cold west drift current. 



Family DAIRELLIDAE 



Bovallius, 1889, p. 331. 

 Vosseler, 1901, p. 50. 



Genus Dairella, Bov. 



Bovallius, 1889, p. 332 (key to the two species). 

 Stephensen, 1924, p. 112. 



Dairella latissima, Bov. 



Stebbing, 1888, p. 1343, pi. clviii. 

 Bovallius, 1889, p. 336, pi. xv, figs. 1-20. 

 Stewart, 1913, p. 254. 

 Stephensen, 1924, p. 112. 



Occurrence: St. 89. South-east Atlantic. 2 <$<$ 6 mm. (penult, instar). 

 Distribution. Mediterranean; Atlantic, 57 N-37^ S. 



Family PHRONIMIDAE 



Genus Phronima, Latr. 

 Stebbing, 1888, p. 1346. 

 Vosseler, 1901, p. 1. 



Stephensen, 1924, p. 113 (key to species and note on vertical migrations). 

 Mogk, 1926, p. 160 sqq. 

 Dudich, 1926, p. 117. 



