CRUSTACEA FROM THE FALKLAND ISLANDS. 349 
Gen. Tanats Andouin & M.-Edwards. 
1829. Tanais Audouin & Milne-Edwards, Précis d’Entomologie, 
vol. i. p. 46, pl. 29. fig. 1. 
TANAIS OHLINI Stebbing. (PI. I.) 
Abstract P.Z.S. 1914, p. 30. (April 28.) 
The segments of the pleon successively decrease in length to 
the sixth, which is longest of all, the curve of its hind margin 
slightly extended at the middle; the fourth and fifth segments 
much the shortest. 
The eyes are irregularly ovoid, bluntly narrowed forward, the 
front margin of the head between them not clearly made out. 
First antenne with third joint a little shorter than second, and 
less than one third as long as the first; flagellum consisting of a 
minute joint, broader than long, with fascicle of sete. Second 
antenne more slender and a little shorter than the first; first, 
joint shorter than third, which is a little over half the fifth, fifth 
rather shorter than fourth, fourth than second ; flagellum one 
little joint with fascicle of sete. One of the mandibles has a 
small tooth-hke accessory plate. Whether the palp of the first: 
maxille is divided into two joints or not, could not be made out 5 
one of its apical sete is very much longer than the other. The 
maxillipeds have an unguis-like spine or fifth joint at the apex. 
The large first gnathopod is of the ordinary type, the movable 
finger rather longer than the thumb, the apical points of the two 
curving one towards the other ; inner margin of the thumb thin, 
not continuous with that of the apex, and flanked with setules. 
The slender second gnathopods have the antepenultimate joint 
not distally widened and without spines, the next joint very 
much longer, with needle-like finger half its length. The two 
following pairs of pereopods have the antepenultimate joint 
distally widened, only a little shorter than the following joint, 
and distally fringed with small spines, the hand and finger similar 
to those of the second gnathopod but shorter. The three 
succeeding pairs of pereeopods have the second joint robust, the 
hand not longer than the wrist, slightly curved, the finger sickle- 
shaped, with four little spines or teeth on the concave margin 
near the apex. The marsupium on the penultimate segment of 
the perzeon was crowded with rather large eggs. The pleopods 
are as usual strongly setose. The uropods are six-jointed, the 
largest joint constituting the peduncle, the five small joints of the 
single ramus being, except the first, plentifully furnished with 
sete. 
Length estimated at 4°5 mm., supposing the body to be 
flattened out. 
Locality. Roy Cove at low spring tide. 
The specific name is given in memory of the late Dr. Axel 
Ohlin, whose valuable researches in the Falkland Islands have 
only been in part reported on, death having interfered with the 
fulfilment of his plans. 
