356 THE REY. T. R. R. STEBBING ON 
quite half as long as the wrist. The pereopods are distinguished 
chiefly by the strong denticulation of the hind margin in the 
second joint of the fifth pair; in this and the two preceding 
pairs the terminal joints are not so long and slender as in 
7. longipes ; the fourth joint is rather narrower in the fifth pair 
than in the two preceding pairs. The branchial vesicles show 
various proximal folds. 
The telson is divided nearly to the base, each division having 
three submarginal spines, and three apical, of which the central 
is the longest, with a setule between it and the very small outer 
spine. 
Length of male9 mm. A second specimen, with flagellum of 
second antenne broken, the remainder of seven joints carrying no 
calceoli and suggestive of a short termination, is probably the 
female. It measures 6 mm., and lke the male is very narrow, 
with the curved process of the epistome conspicuous. 
Locality. Roy Cove, from the depth of 8 fathoms. Specimens 
from Whales Bay, observed after the above description was 
written, show the second antenne a little longer than the first. 
The species is named in honour of my friend, M. Edouard 
Chevreux, a brilliant student of the Amphipoda. 
Gen. AcontiostoMA Stebbing. 
1888. Acontiostoma Stebbing, Rep. Voy. ‘Challenger,’ vol. xxix. 
3 (0S) 
1906. bi Stebbing, Das Tierreich, vol. xxi. pp. 9, 15. 
ACONTIOSTOMA MARIONIS Stebbing. 
1888. Acontiostoma marionis Stebbing, Rep. Voy. ‘ Challenger,’ 
WOl, Sx, Jo, FOS), jolly BO), 
1893. B Ke Della Valle, F. & Fl. Neapel, vol. xx. 
p. 786. 
1906. ss ” Stebbing, Das Tierreich, vol. xxi. 
p. 15, text-fig. 4. 
1912: A F Chilton, Tr. R.Soc. Edinb. vol. xlviu. 
p- 462. 
Mr. Vallentin obtained a specimen from roots of Macrocystis 
on Jan. 14, 1902, and another, 7 mm. long, much more recently 
at Rapid Point, low water of spring tide. The finding of these 
specimens in the Falkland Islands increases the probability, with 
which Professor Della Valle naturally agrees, that my Acontio- 
stoma magellanicus is merely a young form of A. marionis. 
Fam. AMPELISCID2. 
1882. Ampeliscide Sars, Forh. Selsk. Christian. no. 18, p. 29. 
1906. Ms Stebbing, Das Tierreich, vol. xxi. pp. 6, 
Sie 2). 
