PONTOGENEIIDAE 



the 2nd joint of peraeopods 4 and 5, the length of the antennae, and the size of the eye, 

 would not appear from an examination of the present specimens to be clear-cut 

 differential features. 



Distribution. Palmer Archipelago, 25-129 m.; Petermann Island, 40-60 m. 



Genus Prostebbingia, Schell. 

 Schellenberg, 1926, p. 357; 1929 a, p. 278. 



Prostebbingia gracilis (Chevr.) (Figs. 118 d, 121). 



Chevreux, 1913, p. 173, figs. 56-58. 

 Schellenberg, 1926, p. 358. 



Occurrence: 1. St. 173. South Shetlands. Many 

 <$<$ and $$ 5-10 mm. 



2. St. 175. South Shetlands. 7 $$ 

 10-13 mm - 



3. St. 179. Palmer Archipelago. 

 4 $$ 9-12 mm., 2 juv. 6 mm. 



4. St. MS 67. South Georgia. Many 

 S$ and ?$ 5-10 mm. 



5. St. MS 71. South Georgia. 6 ?? 

 6-10 mm. 



6. St. MS 74. South Georgia. 3 S<S 

 5-6 mm., 4 ?? 6-7 mm. 



Remarks. The integument is so minutely Fig I2I Prostebbingia ^^ (Chevr.). a. Head, 

 shagreened as to appear almost nitidulous. b. Pleon segment 3. c. Gnathopod 2. 



The larger specimens, especially those from 

 St. 175, have heavier gnathopods, a rather more prominent post-antennal angle on 

 head, and a small though distinct point on the postero-inferior angle of pleon segment 3. 

 These features are here figured, but I do not propose even a varietal name as there 

 appears to be no clear-cut demarcation between the forms. 



Distribution. Petermann Island and Marguerite Bay, 5-254 m.; 'Gauss' winter 



station, 170 m. 



Genus Atyloella, Schell. 

 Schellenberg, 1929 a, p. 279. 



The discovery of a dentate species confirms Schellenberg's words." Korper glatt oder 

 gezahnt" in the generic diagnosis. 



Atylopsis quadridens, Brnrd. 1930, may belong here, but at the time the Terra Nova 

 Report was written Schellenberg's 1929 paper had not reached me, and I was not clear 

 as to the limits of the various genera. 



Atyloella magellanica (Stebb.) (Fig. 118 g). 



Stebbing, 1888, p. 925, pi. lxxix; 1914, p. 365. 



? Shoemaker, 1914, p. 75. 



Non Chevreux, 1906, p. 64; 1913, p. 178 (= Paramoera edouardi). 



Non Walker, 1907, p. 33, pi. xii, fig. 20 (= Prostebbingia serrata). 



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