CRUSTACEA MALACOSTRACA. III. 



47 



denticles; on the three following segments the lateral margin is angularly bent, and the long process 

 projects from that angle; on third and fourth segments, but not on the second, a very small process is 

 found in front of the large process, and behind the latter process the margin has three or four small 

 processes on second and third segments, but only two on the fourth (fig. 12 c). Fifth and sixth seg- 

 ments each with a very long lateral process and a very small process in front of its base, but behind 

 it the rounded coxa is seen; seventh segment only with a rather short lateral process. — First segment 

 has a median dorsal process, which is extremely long, somewhat thick, denticulate and directed up- 

 wards and a little backwards (a large portion of the process hast been lost in my specimen); each of 

 the other segments, excepting the fifth, has also a median process, but the six dorsal processes decrease 

 very much in size backwards, so that the process on sixth segment is rather short; fifth segment has 

 a minute median denticle. 



First pair of legs (fig. 12 d) robust, but deviating somewhat from those in the preceding forms; 

 fifth joint is nearly longer than deep, with three teeth and two long articulated spines on its lower 

 margin; sixth joint a little more than twice as long as deep; with two somewhat long spines on the 

 prehensile margin; seventh joint with claw not much shorter than sixth joint. 



Abdomen — not including its basal segment — is not much longer than broad (fig. 12 e). 

 Each lateral margin from somewhat from the base to the uropods armed with 12 moderately long, 

 distinctly curved, spiniform, acute processes. The end flatly rounded with a small tooth between the 

 terminal and the lateral margin, while between this tooth and the uropod the latter margin has some 

 minute teeth. 



Length of the specimen n mm. 



Remarks. P. pulchrum agrees with the other northern forms of Pleurogonium in all more 

 important features, but it is abundantly distinguished by the numerous processes on thorax, abdomen 

 and peduncles of auteunulse and antennae. 



Occurrence. Taken by the "Ingolf" at a single station. 



West of Iceland: Stat. 8: Lat. 63°56' N., Long. 24°4o' W., 136 fath., temp. 6-o°; 1 spec. 



Pseudomunna n. gen. 



Description. General aspect of the body nearly as in Munua. — Ocular protuberances low, 

 rounded. Antennulse (PI. IV, fig. 1 b) with third joint of the peduncle elongate; flagellum in the male 

 (probably also in the female) long with a good number of joints. The four proximal joints of the 

 antennae thicker and much longer than in Munna (fig. 1 aj : squama minute, rounded (the remainder of 

 the antennae lost in my specimens). Mandibles (fig. 1 c) in the main as in Munna, with the molar 

 process subcylindrical, but the palp consists of a single, somewhat long, slender joint. Maxillipeds 

 (fig. 1 d) with all parts longer and more narrow than in Munna; second joint with lobe about two 

 and a half times as long as broad; fourth and fifth joints somewhat feebly expanded, and each longer 

 than broad ; epipod lanceolate, more than twice as long as broad. 



Thoracic segments and coxse as in Munua. — First pair of legs (fig. 1 e) differ much from 

 Munna; fifth joint nearly twice as long as the fourth or the sixth joint, with mail)' long and robust 



