EUSIRI.DAE 189 



Occurrence: 1. St. 27. South Georgia. 1 ? 15 mm. 



2. St. 123. South Georgia. 5 $$11-12 mm. 



3. St. 140. South Georgia. 1 $ 12 mm., 3 $? 11-12 mm. 



4. St. 144. South Georgia. 2 $$ 11 and 18 mm. 



5. St. 149. South Georgia. 3 ?? about 13 mm. (mutilated). 



6. St. 167. South Orkneys. 1 ? about 15 mm. (head missing). 



7. St. 175. South Shetlands. 1 $ 24 mm. 



8. St. 181. Palmer Archipelago. 1 <$ 19 mm., 1 ovig. ? 24 mm. 



9. St. 182. Palmer Archipelago. 1 $ 19 mm. 



10. St. 195. South Shetlands. 4 $$ 15-29 mm. 



11. St. WS 88. South America. 1 ^ 10 mm. 



Remarks. The eye, as preserved, is brown, surrounded by a paler ring. 



In the above material, nos. 1-7 and 11, i.e. those from South Georgia, South Orkneys, 

 point of South America and Bransfield Strait (59 W), have only pleon segments 1 and 

 2 dentate; nos. 8-10, i.e. those from the Palmer Archipelago and Bransfield Strait 

 (58 W), have peraeon segment 7, and sometimes also segment 6, dentate as well as pleon 

 segments 1-3 (no. 10 has no tooth on segment 3). Thus there seems to be some evidence 

 of a more easterly bidentate race, and a more westerly quadridentate (sometimes tri-, 

 sometimes quinque-dentate) race. Nos. 7 and 10, however, overlap; and the evidence 

 for geographical races is cancelled if we include the bidentate laticarpus from the still 

 more westerly region of Marguerite Bay in the synonymy of antarcticus. 



With more abundant material, the doubt expressed in the Terra Nova Report (1930, 

 p. 385) as to the synonymy of laticarpus may prove justified. It may be noted also that 

 two of Chevreux's records (1913^. 167) of this species are from sponges and may thus 

 indicate that this is more of a bottom dweller than the other species seem to be. 



Distribution. Sub-antarctic and Antarctic regions. 



Eusirus perdentatus, Chevr. (Fig. 115). 



Chilton, 1912, p. 492, pi. ii, fig. 20 (splendidus). 

 Chevreux, 1913, p. 163, figs. 50-52. 

 Barnard, 1930, p. 386, fig. 46 c (references). 



Occurrence: 1. St. 167. South Orkneys. Many $$ up to 40 mm., ?$ up to 52 mm. 



2. St. 170. South Shetlands. 2 $<$ 38, 40 mm. 



3. St. 180. Palmer Archipelago (160 m.). 1 £ 38 mm. 



4. St. 181. Palmer Archipelago. 1 6*> 1 $ both 47 mm. 



5. St. 186. Palmer Archipelago. 1 $ 40 mm. 



6. St. 190. Palmer Archipelago (90-130 m.). 3 immat. £$ 26-28 mm., 2 immat. $? 

 25-26 mm. 



7. St. 190. Palmer Archipelago (315 m.). 1 immat. $ 26 mm. 



8. St. 195. South Shetlands. 1 ovig. $ 50 mm. 



Remarks. As preserved the eye is dark brown, surrounded by a paler ring. 



There is only one actually ovigerous $; the largest ?? from St. 167 have the brood 

 pouches fully developed and extended but empty, and are thus either spent or have lost 

 their eggs during capture and preservation. The dates of these captures were in February 

 and March. The Terra Nova fully-developed $? were caught in January and February. 



