DEXAMINIDAE 217 



Family DEXAMINIDAE 



Stebbing, 1906, p. 514. 



Schellenberg, 1928 (Trans. Zool. Soc, pt. v), p. 652. (New genus and redefinition of Dexa- 

 minoides Spandl.) 



Genus Paradexamine, Stebb. 



Stebbing, 1906, p. 518; 1910, p. 602. 

 Chevreux, 1906, p. 88. 

 Barnard, 1930, p. 389. 



Paradexamine fissicauda, Chevr. 



Chevreux, 1906, p. 88, figs. 51-53; 1913, p. 181. 

 Chilton, 1912, p. 501 (pacifica, non Thorns.). 



Occurrence: 1. St. 141. South Georgia. 1 c? 15 mm. 



2. St. MS 63. South Georgia. i,Jii mm. 



3. St. MS 65. South Georgia. 1 S 13 mm. 



4. St. MS 66. South Georgia. 1 <J 14 mm. 



5. St. MS 74. South Georgia. 1 $ 10 mm. 



6. East Cumberland Bay, South Georgia. 1 $ 16 mm. 



Remarks. I see every reason for considering this species distinct from pacifica, and 

 as noted in the Terra Nova Report the characters which separate the two species are the 

 lateral angle of the head, the 2nd joint of peraeopod 5, and the telson. The 2nd joint of 

 peraeopod 5 has a perfectly smooth and straight hind margin, devoid of setae except one 

 large and one to two small ones at the distal corner. 



Contrary to the opinion expressed in the Terra Nova Report, neither the 3rd uropods 

 nor the antennae appear to exhibit sexual differences. All these appendages agree with 

 Chevreux's account and figures. The absence of dense fascicles of setae on the antennae 

 in fissicauda is therefore an additional distinction from pacifica. 



Distribution. Palmer Archipelago, 25-129 m.; South Orkneys, 2-10 fathoms. 



Genus Polycheria, Hasw. 



Stebbing, 1906, pp. 519, 735. 

 Schellenberg, 193 1, p. 212. 



Polycheria antarctica (Stebb.). 



Chilton, 1912, p. 502 (literature and discussion). 



Schellenberg, 1926, p. 370, fig. 58; 193 1, pp. 214 sqq., figs. 107-112. 



Barnard, 1930, p. 390, fig. 49 d. 



Non Barnard, 1916, p. 211 (= atolli). 



Occurrence: 1. St. 39. South Georgia. Two specimens 3-3-5 mm. 



2. St. 51. Falklands. Fourteen specimens 3-5 mm., apparently all ?$, from sponge. 



3. St. 142. South Georgia. 1 £ 7 mm., 9 ?? 6-8 mm., 3 juv. 3-4 mm. 



4. St. 144. South Georgia. 1 $ 7 mm. 



5. St. WS 27. South Georgia. 1 <J 4-5 mm. 



6. St. MS 64. South Georgia. 4 ovig. $$ 5 mm. 



7. St. MS 71. South Georgia. One specimen 5 mm. 



28 



