CAPRELLIDAE 303 



Colour (as preserved), whitish, with grey or purplish specks, distal half of hand of 

 gnathopod 2 in both sexes also speckled; eyes unpigmented. 



With due respect to Mayer, I cannot help suspecting that Piperella grata, Mayer, 1903, 

 from South Georgia, and in fact from the same collection whence Pfeffer obtained his 

 species, is only the young of this species. 



Distribution. South Georgia. 



Genus Dodecas, Stebb. 



Stebbing, 1888, p. 1232; 1910, p. 629. 



Mayer, 1890, p. 15; 1903, p. 29. 



Briggs, 1914 (Proc. Roy. Soc. Tasmania), p. 76. 



The genus is austral in distribution, the three hitherto known species being reported 

 from Kerguelen (elongata) and South-east Australia [hexacentrum and decacentmm) . 



Dodecas reducta, n.sp. (Fig. 169 b). 



Occurrence: St. 39. South Georgia. 1 $ 16 mm. 



Description. Forehead rounded. Eyes rather large, circular, distinct. Peraeon seg- 

 ment 2 equal to head plus 1st segment; segments 3, 4, 5 successively increasing a little, 

 segment 6 subequal to segment 3. A forwardly curving horizontal spine over base of 

 gnathopod 2, and a subdorsal pair of similar spines in middle of segment 3. 



Antenna 1, flagellum at least 8-jointed, but broken. Antenna 2, flagellum 5-jointed. 



Gnathopod 2 inserted in middle of segment, 2nd joint reaching to front of head 

 (= 4th-6th joints together), 5th about one-third length of 2nd, and half length of 

 6th (but owing to fusion with 6th, its distal end difficult to define), 6th ovate, palm with 

 basal spinigerous tooth, followed by two small spinigerous tubercles, then obscurely 

 serrulate and ending in a low truncate tooth near hinge. 



Peraeopod 1 about one-third length of segment 3, very slender, but with full comple- 

 ment of joints. Peraeopod 3, 4th joint as in the other species of the genus. Peraeopods 

 4 and 5 slender, 2nd and 4th joints slightly bulbous distally, 5th with 3-4 spines on 

 inner margin, 6th stouter than any of the other joints, widest proximally, inner margin 

 with two pairs of spines proximally, one spine near middle and one spine near apex, 

 both 6th and 7th joints stouter than in elongata. 



Branchiae on segment 2 very small and easily overlooked, scarcely larger than the 

 size of the eye ; on segment 3 narrow ovate, about as long as peraeopod 1 ; on segment 4 

 slightly smaller. 



Remarks. This species is obviously close to both elongata and hexacentrum. From 

 the former it differs in possessing spines on the body, the position of insertion of gnatho- 

 pod 2, the much shorter 5th joint of the 2nd gnathopod, the shorter peraeopod 1, the 

 stouter 6th and 7th joints of peraeopods 4 and 5, and the reduced branchiae on segment 2. 

 From the latter it differs in having only four spines on the body, the shorter 5th joints 

 of gnathopod 2 and the reduced peraeopod 1 and branchiae on segment 2. 



