EUSIRIDAE 191 



Eusirus microps, Wlkr. 



Walker, 1907, p. 31, pi. xi, fig. 19. 

 Barnard, 1930, p. 385, fig. 47 (references). 



Occurrence: 1. St. 116. Bouvet Island. 1 juv. 8-5 mm. 

 2. St. 202. South Shetlands. 1 ? 34 mm. 



Remarks. The eyes as preserved are black. The juvenile from St. 116 is interesting. 

 Small as it is, there is no doubt that it belongs to this species. The eye is subcircular and 

 the side-plates are characteristically shallow. The hands in both gnathopods are oval, 

 though the anterior margin is slightly shorter than the anterior margin of the 5th joint. 

 Only pleon segments 1 and 2 are dentate. 



In contrast to both the preceding species, this species seems to inhabit the upper 

 layers, though maybe it ascends at night time, as both the present captures were made 

 at night. From previous records it would seem to be a frequent food of penguins. 



Distribution. McMurdo Sound; Petermann Island; 'Gauss' winter station. 



Genus Eusiroides, Stebb. 



Stebbing, 1906, pp. 345, 729; 1910, p. 594. 

 Pirlot, 1929 a, p. 10. 

 Schellenberg, 1929 a, p. 282. 



For further reasons against Chilton's suggestion of sinking this genus in Bovallia, see 

 under the latter genus (p. 196). One may refer here to the importance of examining the 

 integumentary sculpture. The present specimens, and the South African ones referred 

 to monoculoides (Barnard, 19 16, p. 174), exhibit a type of sculpture entirely different 

 from that of Bovallia. 



Eusiroides georgianus, n.sp. (Fig. 116). 



Occurrence: 1. St. 141. South Georgia. 1 ovig. $15 mm. 



2. St. 159. South Georgia. 1 ovig. $ 16 mm. 



3. St. 170. South Shetlands. 3 $$ (2 ovig. 1 with embryos) 16-17 mm. 



4. St. 175. South Shetlands. 1 $ 16 mm. 



5. St. WS 25. South Georgia. 2 ?? 16 and 20 mm., 1 ovig. $ 20 mm. 



6. St. MS 25. South Georgia. 1 c? 15 mm., 1 ovig. $ 18 mm. Types. 



7. St. MS 71. South Georgia. 1 $ 20 mm. 



Description. Agreeing in almost every particular with Stebbing's original descrip- 

 tion and figures of crassi. Whole peraeon and pleon dorsally rounded, without any sug- 

 gestions of teeth. Postero-inferior angle of pleon segment 3 rather more produced than 

 in Stebbing's figure, rounded, but with a tiny tooth and a rounded sinus. Side-plate 1 

 strongly widened below and produced forwards. 



Gnathopods 1 and 2, 6th joint more ovate, palm more oblique and longer than in 

 Stebbing's figures of crassi, thus approximating to those of caesaris ; the palmar spines 

 also like those of the latter species, not so stout as in crassi. 



