3- Tortanus murrayi nov. sp. Plate LVI, figs. i — 8. 



Female — length 2,65 mm. 



Seen from above, the body appears elongate and rather slender. The length is slightly 

 less than three times the width. The head is separated from the first thoracic segment. The 

 fourth and fifth thoracic segments are completely fused together. The last thoracic segment is 

 symmetrical. It is slightly produced posteriorly and the distal margins are rounded. The eye 

 is large and conspicuous. A small triangular spine is visible under each eye when the Copepod 

 is vievved from the side (Plate LVI, fig. 2). 



The abdomen is composed of tvvo segments. The combined length of the abdomen and 

 furca is contained three times in the total length of the cephalothorax, from the frontal margin to 

 the base of the genital segment. The genital segment is almost symmetrical in outline. The distal 

 end of the left side is furnished with a distinct tubercle. The anal segment and furcal joints are 

 fused together. The furcal joints are asymmetrical and comparatively short. The joints appear to 

 be almost as long as the anal segment. The left furcal joint is much broader than the right joint. 

 The setae are placed at the apex of each joint. The lateral margins are naked (Plate LVI, fig. 1). 



The antennules are composed of seventeen joints and extend to about the middle of 

 the furcal joints. 



The antennae, mandibles, maxillae, maxillipedes and first four pairs of feet are similar 

 to those of Tortanus o-racilis. 



The fifth pair is composed of two free joints attached to a basal part. The second free 

 joint is long and comparatively slender. The distal end of this joint is produced into three 

 very strong spines. The last joint of the right foot is as long as the last joint of the left 

 foot, but is slightly wider (Plate LVI, fig. 5). 



Male — length 2,25 mm. 



The male is similar in general appearance to the female, but the abdomen is composed 

 of five segments. The middle joints of the right antennule are considerably inflated. The proximal 

 hinge joint is furnished with a fringe of fine spines on the upper margin. The distal hinge 

 joint is armed with a comparatively strong spine and a slender seta at the distal end of the 

 upper margin (Plate LVI, fig. 6). 



The antennae, mandibles, maxillae, maxillipedes and first four pairs of feet are similar 

 to those of the female. 



The fifth pair is large and prehensile. The right foot is cheliform and is much shorter 

 than the left foot. It is composed of two free joints. The proximal end of the inner margin 

 of the first joint is produced into two strong tooth-like processes. The second joint is claw-like. 

 The left foot is composed of three free joints. The second joint has a well defined tubercle 

 on the middle of the inner surface. The third joint is nearly as long as the second joint, but 

 it is slightly narrower. The apex is furnished with two slender curved spines (Plate LVI, fig. 7). 



This species is quite distinct from any of the known members of the genus. The female 

 is easily identified by the left furcal joint being broader than the right, and by the three large 

 spines at the apex of the second free joint of the fifth pair of feet. 



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