JASSIDAE 243 



bevelled. Peraeopod 3 with 2nd~5th joints very broad (d.frequens, Chilton, 1921, p. 227, 

 fig. A D). 



The identification of these specimens with Sars' species is only provisional, pending 

 comparison of more specimens with material from northern waters. 



Genus Ischyrocerus, Kroy. 

 Stebbing, 1906, pp. 657, 739. 

 Barnard, 1916, p. 264. 



Ischyrocerus anguipes, Kroy., var. longimanus, Hasw. 

 Barnard, 1930, p. 393. 

 Occurrence'. St. 5. Tristan da Cunha. 2 rjrj 3-5 mm., 3 immat. $$ 3 mm., 2 ovig. 52 275 mm. 



Remarks. These appear to be typical examples of the var. longimanus, with the tooth 

 at base of the 6th joint in gnathopod 2 in the <$ ; in the adult $ the tooth is well developed 

 and projects backwards. No epistomial projection. 



Colour, pale, mottled with greyish, especially on head and first five peraeon segments. 



Distribution (of var. longimanus). South-east Australia; New Zealand; Auckland 

 Islands. The distribution is curious and needs confirmation. 



Genus Parajassa, Stebb. 

 Stebbing, 1906, p. 649. 



Parajassa tristanensis (Stebb.). 



Stebbing, 1888, p. 1141, pi. exxi; 1906, p. 650. 

 Occurrence: St. 4. Tristan da Cunha. Fifteen specimens (J<J and ovig. $2 3-3*5 mm. 

 Remarks. For colour see under next species. 

 Distribution. Tristan da Cunha, 1 10 fathoms. 



Parajassa georgiana, Schell. (Fig. 152). 

 Schellenberg, 193 1, p. 247, fig. 128. 

 Occurrence: St. MS 10. South Georgia. 2 $$ 4-5 mm. 



Description. Closely allied to, but larger and more robust than tristanensis. The 

 epistomial projection more strongly developed than in the latter species, laminate. 

 Antenna 2 longer and stouter than antenna 1, as in pelagica, but without the dense 

 fascicles of setae found in that species. 



Gnathopod 1, 5th joint oblong, relatively broader than in tristanensis, 6th sub- 

 triangular, the palm longer than hind margin, defined by a spine. Gnathopod 2 very 

 strong, 2nd joint broadly expanded on front and hind margins, 3rd with front margin 

 produced in a subacute tooth, 5th proximally gibbous as in tristanensis, 6th almost as 

 broad (distally) as long, palm slightly oblique, with a blunt somewhat crenulate tooth 

 near hinge, followed by a shallow excavation, defining tooth subacute. Peraeopods 1 

 and 2, 2nd joint stout, especially in peraeopod 2. 



Remarks. Future research may prove that this is only a form of tristanensis. But the 



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