AMPITHOIDAE 239 



Gnathopod 1 simple, alike in both sexes, 5th joint longer than 6th, both densely setose, 

 especially in J, a small spine at lower distal apex of 6th, finger not quite half length of 

 6th joint. Gnathopod 2 simple, unlike in the two sexes ; in £ stout, 5th joint expanded, 

 upper and lower margins straight, diverging, 6th much shorter, subtriangular, gibbous 

 on upper margin at base, narrowing rapidly, 5th and 6th joints densely setose, finger 

 reduced, the unguis very short and blunt ; in $ more slender, 5th joint slightly expanded, 

 the lower margin gently convex, 6th short, oval, both joints densely setose, more so 

 than in 6* and the setae longer, finger very small. 



Peraeopods 1 and 2, 2nd joint broadly oval, glandular, 4th and 5th subequal, the latter 

 slightly narrower, oval, 6th longer, slender, dactyl two-thirds length of 6th, very slender. 

 Peraeopods 3 and 4, 4 somewhat longer than 3, 2nd joint oval, hind margin slightly 

 convex, with spaced, short plumose setae, 4th and 5th subequal, 6th longer, 5th with 

 two stout spinules, 6th with 4 (-5), dactyl short, stout, unguis slightly hooked. Peraeo- 

 pod 5 much longer than peraeopod 4, with more numerous setae on hind margin of 2nd 

 joint, 5th and 6th joints more slender, otherwise similar. 



Uropod 1 extending slightly beyond uropod 2 ; both with a stout spine on lower apex 

 of peduncle, rami strongly spinose. Uropod 3 slightly shorter than uropod 2, uniramous, 

 the ramus shorter than the peduncle, strongly spinose. 



Colour (as preserved), pale greenish, but this may be due to the preservative, as the 

 other specimens in the same tube, belonging to several species, were all more or less 

 of the same tint. 



Family AMPITHOIDAE 



Stebbing, 1906, pp. 631, 738. 



Genus Ampithoe, Leach. 

 Stebbing, 1906, pp. 631, 738. 

 Barnard, 1916, p. 253. 



Ampithoe brevipes (Dana) (Fig. 150). 

 Stebbing, 1906, p. 637; 1914, p. 371. 

 Non Barnard, 1916, p. 255 (= falsa, n.sp.). 



Occurrence: 1. St. 4. Tristan da Cunha. 1 c? 9 mm., from Macrocystis. 



2. St. 53. Falklands. 4 $$ 15-17 mm., 2 ?$ 16 and 19 mm., from kelp root. 



3. St. 55. Falklands. 2 <$<$ 13 and 17 mm., 1 $ 15 mm. 



4. St. 56. Falklands. 2 <$<$ 15 and 18 mm., 1 ovig. $ 19 mm. 



Remarks. The Tristan da Cunha specimen fits Bate's figure (1862) pi. xli, fig. 6 

 (falklandi) well, but being a <$ has the 2nd gnathopod as in his figure pi. xliii, fig. 2. 



Stebbing (19 14) having only a ? specimen, was able to add nothing which might help 

 towards a more exact definition of this species. He states that his ? specimen agreed 

 with Dana's figures of brevipes. Dana's peregrina and Bate's falklandi were founded on 

 ?$ (or juv.). Bate's figures of brevipes (pi. xliii, fig. 21, after Dana) and of chilensis 

 (pi. xlii, fig. 5, after Nicolet) might both be considered applicable to the present speci- 

 mens without undue violence to the imagination. 



