86 



the penultimate and one and a half as far distant from the penultimate as the penultimate from 

 the antepenultimate. The peraeopods of the i^' pair measure 33 mm. and the distal third of 

 the carpus, which is 13,5 mm. lon^^, reaches beyond the antennal scale. Legs of the 2"'' pair 

 66 mm. long-, the merus, long 17 mm., extends by a little more^han one-third its length, viz. 

 7 mm., beyond the antennal scale; carpus 28 mm. long, chela 3,75 mm. Other legs lost. 



In the 3''^ specimen, finally, the rostrum reaches just beyond the 2"^ antennular article 

 and is armed above with 14 teeth, six of which are on the carapace, the 7"' above the orbital 

 margin; the teeth are closely set, except the 10''' and the 11"^, which are farther distant from 

 one another and from the g"' than the rest, appearing therefore longer; tip of rostrum a little 

 upturned. Lower tooth midway between the tip and the foremost tooth of the upper margin. 

 All the legs are wanting. 



The 28 specimens from Stat. 262 are mostly well preserved, as regards the legs etc., 

 22 are ova-bearing females, but there is only one male, which is 70 mm. long, while the 

 carapace, rostrum included, measures 21,5 mm. The measurements of 5 ova-bearing females 

 and one young female are indicated in the Table at p. 89. The largest egg-bearing female 

 measures 104 mm. from tip of rostrum to ti]) of telson, while the smallest female, provided 

 with eggs, is 75 mm. long. The single specimen of Xci/iat. paticide^itains Bate, collected by 

 the "Challenger", was 100 mm. long and the carapace, rostrum included, measured a little less 

 than one-third the length of the animal, exclusive of the rostrum and the telson (C. Spknck 

 Bate, I.e. p. 816). In all the specimens from Stat. 262, like also in those from the other 

 Stations, the car?pace, rostrum included, measures a little more than one-third the length 

 of the animal, without rostrum and telson: the measurements of the female and of the 

 male of Xciiiai. nndiilatipes, mentioned by Bate (1. c. p. 802), on the contrary, agree very 

 well with those of the "Siboga" species. As regards the relative length and .shape of carapace 

 and abdomen, the "Siboga" specimens resemble also the figure of Xcniat. cursor A. ]\L-Edw. 

 in the above-mentioned "Recueil" and agree likewise with the measurements published by S. L 

 Smith (1. c), but the dorsal border of the cardiac region, that in this figure runs quite .straight, 

 appears in our specimens, however, slightly convex. 



Excepting the two youngest individuals, like also an ova-bearing female in which 

 the rostrum is broken off, the rostral formulae of 25 specimens from Stat. 262 are the 

 following. In 3 specimens, all ova-bearing, the upper margin is armed with nine teeth, in 5, 

 three of which are ova-bearing, with ten, in 8, namely in the male and in 7 females, 6 of 

 which are ova-bearing, with eleven, in 4, all ova-bearing, with twelve, in 3, all with eggs, 

 with thirteen and in 2, also ova-bearing, with fourteen teeth, so that in two-thirds of the 

 specimens 9 — 11 (usually 11) teeth are observed and only in one-third 12 — 14. Excepting 3 

 ova-bearing specimens the lower border is constantly armed with one tooth near the tip. In 

 more than half the number of the specimens, namely in 13, five teeth of the upper margin 

 are implanted on the carapace proper, in 8 specimens six, in 3 four and only in i specimen, 

 an egg-bearing female, seven teeth occur behind the orbital margin. Among 20 specimens the 

 rostrum did extend in 9 to the distal extremity of 2^^ antennular article, in 10 to the middle 

 of 3"' and only in one ova-bearing female to the far end of the peduncle. The tij) of the 



