j, CRUSTACEA MALACOSTRACA. III. 



process distinctly shorter with the end more obliquely cut off; in Munnopsurus their distal parts are 

 extremely reduced or wanting, and the molar process is a broad, large, rounded tubercle (see later on) ; 

 palp well developed. Maxillipeds in the main as in the Ianirini; epipod moderately or very large. — 

 Thoracic segments divided into two sections; the four anterior segments movable; the three posterior 

 segments very different from the four anterior, and frequently either only fifth and sixth or all three 

 inunovablv coalesced. First pair of legs distinctly prehensile or very slender and then at most feebly 

 prehensile; second pair more similar to third than to first pair, and generally very similar to third pair, 

 though always distinctly shorter; third and fourth pairs moderately to extremely long, with second 

 joint long, about as long as or much longer than the third. The three posterior pairs natatory; fifth 

 and sixth joints more or less expanded with marginal setae; seventh joint always distinct, frequently 

 long. Uropods ventral, biramous; peduncle oblong or thick, but not lamellar and without any row 

 of setse on the lateral margin. 



Remarks. This group comprises four northern genera: Syneurycope n. gen., Storthyngura 

 Vanhoffen, Munnopsurus Richardson and Eurycope G. O. Sars, while a fifth genus, Munneurycope 

 Stepheusen, is cancelled and its species referred to Eurycope. The most interesting differences between 

 this group, the Ilyarachniui and the Munnopsini are found in the second to fourth pair of legs. Other 

 differences are found in the antennuhu, the mandibles, the uropods, etc. 



Syneurycope n. 



sen. 



Description. Body very slender. -- Head without any front area marked off by keels. — 

 Antennulje (figs. 4 a — 4 c) placed at the front end of the head only a little from one another and very 

 peculiar; first joint subcylindrical; second joint much longer than the first and attached to its end; 

 third joint very much longer than the second and longer than the flagellum. — Antennae lost except- 

 ing the four proximal joints (fig. 4d); third joint a little longer than broad or deep, without squama; 

 fourth joint cylindrical and as long as the third. — Left mandible (fig. 4 e) about as in the Ianirini, 

 having the incisive part, the movable lacinia, some seta? and the cylindrical, strong, at the end obliquely 

 cut molar process well developed; third joint of the palp only feebly expanded at the middle. — 

 Maxillipeds (fig. 4 f) with fourth and fifth joints much expanded, but yet narrower than second joint; 

 sixth joint without any produced lobe; epipod extremely large. 



The four anterior thoracic segments movable, while the three posterior segments are immov- 

 ably fused. Epimera not developed, as the first joint of each leg is rounded, not plate-shaped or pro- 

 duced in any process. -- First pair of legs (figs. 4 h and 4i) moderately slender, prehensile; second 

 joint long, much longer than the third, which is as long as the fifth and slightly longer than the 

 sixth; fifth joint with a few spines on the lower margin. Second pair (fig. 4 k) as to length intermediate 

 between first and third pairs; second joint about as long as in first pair, a little longer than fifth joint, 

 which is a little longer than the sixth; third joint somewhat shorter than the second and slightly 

 longer than the fourth; seventh joint nearly longer than the fourth, and the claw is distinct though 

 very small. — Third and fourth pairs considerably longer than the body, with fifth and especially 

 sixth joint very elongate; second joint long, longer than the third, which is much shorter than the 



