CRUSTACEA MALACOSTRACA. III. i^i 



fourth. — The three posterior natatory pairs uncommonly narrow (figs. 4 a, 4I and 411), decreasing a 

 little in length and considerably in breadth from fifth to seventh pair; fifth pair has the fifth joint 

 nearly three times as long as broad and a little broader than the sixth, and both these joints have a 

 moderate number of natatory setae along both margins, while in the two posterior pairs these two 

 joints are narrower with fewer setae; sixth joint in all three pairs with a long, stiff, nearly spiniform 

 seta just below the insertion of seventh joint (fig. 4 m), which is long, more or less compressed, with 

 the minute claw at the end. 



Abdomen (figs. 4 a and 4 b) has a very short basal segment, and the articulations in front of 

 and behind this segment are probably slightly movable. Abdomen posteriorly much produced, with a 

 somewhat long, narrow portion; the uropods small, biramous (fig. 4 o). 



Remarks. This genus is more allied to Storthyngura than to the other genera, agreeing with 

 it in having the three posterior segments coalesced. As in Enrycopc and Storthyngura the mandibles 

 have all parts well developed. But in Syneurycope the body and the three posterior pairs of legs are 

 much more slender than in the other genera, and fourth joint in third and fourth pairs of legs is much 

 longer than third joint. The peduncle of the antennae differs especially in length and shape of fourth 

 joint, while the antenuular peduncles differ greatly from those in all other genera of this group or of 

 the two other allied groups. 



Only a single species is known. 



85. Syneurycope parallela 11. sp. 

 (PI. XII, figs. 4 a— 40). 



Male. Very slender, more than five times as long as the breadth of fourth thoracic segment, 

 very moderately depressed. Each of the four anterior segments and especially the head with the median 

 dorsal area raised and irregularly sculptured. — Antenuulae (fig. 4 c) not fully half as long as the body; 

 first joint considerably longer than deep; second joint more slender than the first and about half as 

 long again as that joint; third joint slightly shorter than the sum of the two preceding joints, and a 

 little longer than the flagellum, which consists of about 16 joints. Maxillipeds (fig. 4 f) have the inner 

 margin of fifth joint armed with a number of irregular, spiniform teeth (fig. 4 g). 



First pair of thoracic legs (figs. 4 h and 4 i) with three vertical spines on the lower margin of 

 fifth joint. Second pair (fig. 4 k) with many very short spines on the lower margin of fifth, sixth and 

 the distal part of fourth joint. Third and fourth pairs without spines along the margin of fourth to 

 sixth joint; fourth pair a little more than half as long again as the body. 



Abdomen a little shorter than the three posterior thoracic segments combined (fig. 4 b), consider- 

 ably more than half as long again as broad, being much produced backwards, with the posterior half 

 narrow and terminating in an acute angle. — The operculum could not be examined ; it is very far 

 from reaching the end of the abdomen. — The uropods (fig. 4 b and 40) small; the exopod (ex) minute, 

 while the endopod is about as long as the very oblong peduncle. 



Length 37 mm. 



Remarks. This species is distinguished by many features from all other forms of natatory 



Asellota hitherto known. It may, however, be possible that later, if more forms of the genus are 



17* 



