285 



side a prominent carina curves backward and outward to the lateral extremity of the posterior 

 margin of the tergum ; between this carina and the posterior margin of the 3''<* tergum two 

 shorter carinae are observed on each side. In Po7it. angustirostris, however, these lateral 

 carinae are rather inconspicuous. The two submedian carinae on the 5"' tergum are also 

 prominent and diverge already from about the middle. The two longitudinal carinae on the 

 6''' somite converge slighdy backward. Telson and uropods resemble also those of Po)it. 

 angustirostris, but the anterior of the two pairs of dorso-lateral spinules is placed, in the female, 

 just before the middle and the acuminate extremity is about one and a half as long as 

 wide at base. 



Eyes large, their greatest diameter, 1,2 mm., measuring in the male almost one-third 

 the length of the carapace without the rostrum; facets small and numerous, cornea of a dark 

 slate colour. 



Second and third joint of antennular peduncle very short, of equal length, together much 

 shorter than basal article; distal margin of the latter with many long, upstanding setae, while 

 the 3'^'' joint bears a subacute conical tubercle. Upper antennular flagellum of the male very 

 broad, 3,7 mm. long, almost as long as the carapace without the rostrum. 



The antennal scale has the same form in both se.xes; in the male (Fig. 68 r) it is 2,52 mm. 

 long, three-fifths the length of the carapace without the rostrum, and 3,6-times as long as 

 broad, the greatest breadth at the proximal fourth ; the scale has therefore a rather narrow shape, 

 the inner margin slopes sharply away from the base of the distal tooth, which is slender and 

 long, measuring Yio '^^e whole length of the scale, and the outer margin, which is strongly 

 concave, is armed, like in Potif. ajigustirostris, with a we 1 1 - d e v e 1 ope d spine at the 

 proximal third. The antennal peduncle reaches along four-fifths of the scale and the spine 

 at the infero-external angle of the 2""^ article is small. 



The i^' pair of peraeopods (Fig. 68^', 68«?) reach in the male as far forward as the antennal 

 scale and are of a rather stout shape. Measured along the upper margin the merus proves 

 to be just half as long as the carapace, rostrum excluded, and to be 2,4-times as long as wide 

 on the outer surface; the upper margin ends distally in a small spine, but, otherwise than in Pont, 

 angustirostris^ the distal margin of the outer surface is unarmed; lower outer border carinated. 

 Carpus distally with 2 or 3 spines. Propodus of subchela in the male 2,5 mm. long, a little more 

 than half the length of the carapace, without the rostrum, and 2,6-times as long as wide in the 

 middle; thumb formed of a single spine, that measures one-fifth the length of the propodus. 



The peraeopods of the 2"^' pair reach in the male to the far end of the carpus of the 

 anterior legs; merus 1,1 mm. long, carpus 0,62 mm., chela 1 mm., one and a half as long as 

 the carpus; dactylus 4-times as long as the palm, a little longer but distinctly less broad than 

 the immobile finger, palm as long as wide; the 2"** legs are provided with many long hairs, 

 of which those on the upper margin of the merus are fringed with long, the rest with quite 

 short setulae. The other peraeopods are wanting or incomplete. 



E.xopodite of 2"'' pleopod (Fig. 68/, 68^) of the male rather narrow, 4Y3-times as long 

 as wide and one and a half as long as the protopod; the endopodite, nearly 6-times as long as 

 broad, measures five-sixths the length of the outer branch and bears a well-developed stylamblys 



