402 PERCY SLADEN TRUST EXPEDITION 



first joint of the antennular stalk, its tip is simple, and it bears one tooth above at 

 the level of the eye and none below. The antennular stalk is a little shorter than the 

 antennal, its last two joints are very short and broad, and it bears a strong spine on 

 each joint, those on the first two joints being sharp and external and the third broad, 

 dorsal, and sutured. The antennal stalk is nearly half the length of the scale. The 

 latter reaches nearly as far as the stouter flagellum of the antennule, has a convex . 

 inner edge, a straight outer edge, and a rounded end, and bears on the outer side a 

 distal spine, which does not project as far as the end. The third maxilliped is strong, 

 and outreaches the antennal scale in the male by more and in the female by less than 

 the whole of the last joint. The last and antepenultimate joints are subequal, each more 

 than twice as long as the penultimate joint, the last joint is spinous, and all the joints 

 are hairy. The first leg in the female is stout, simple, and shorter than the third 

 maxilliped. In the male, it is as long as the body, granulate, and stout, but with 

 the chela no stouter than the rest of the limb, the arm and hand are subequal, and the 

 fingers about one quarter the length of the palm^ on which they are bent inwards 

 at an obtuse angle, each bearing a low tooth. The second leg has the wrist 5 -jointed, 

 with the second joint much longer than any of the others and showing an indistinct 

 ring near its proximal end. The legs of the last three pairs are alike in the two 

 sexes, of medium length, with a blunt spine at the end of the carpopodite, a row of 

 spinules under the propodite, and the dactyle short, stout, ending in a slender claw, and 

 bearing below several moveable spinules of which the last is longer than the end claw. 

 The telson is shorter than the uropods, narrow, and tapers to an obtusely triangular 

 end bearing six spines, of which the intermediate pair are the longest. 



Length of longest specimen 1 3 mm. 



The genus Thor has hitherto contained only one known species, T. paschalis 

 Heller 1861 {T. floridanus Kingsley). The present species has all the characters of 

 the genus, including those of the mandible, but the great claw of the male is a new 

 feature. The principal differences from T. paschalis are presented by the supraorbital 

 spine, the rostrum, the first and third legs of the male, and the proportions of the 

 joints of the second leg. 



Specimens were taken at Male Atoll in the Maldives, in Minikoi, and at Salomon I. 



Genus TozEUMA. 



12. Tozeuma armatum Paulson, 1875. 



Red Sea Crustacea, p. 99, PL 15. figs. 2a— o. Kemp, Rec. Ind. Mus. x. p. 106 (1914). 

 Specimens were taken in various depths in the Maldives, the Seychelles, and 

 Cargados Carajos. 



Genus Lysmata. 



13. Lysmata affinis Borradaile, 1915. 

 Ann. Mag. Nat. Hist. (8) xv. p. 209. 

 Diagnosis: a Lysmata closely related to L. seticauda (Risso), 1816, and to L. chiltoni 



Kemp, 1914, but distinguishable from them and from the other species of the genus 



