no. 2065. THE CRUSTACEA EUPHAUSIACEA— HANSEN. 89 



fifth, with about nine somewhat spiniform setae along its prehensile 

 margin; seventh joint considerably deeper than long, with four spini- 

 form setae. The following pairs of legs with their setae fine and the 

 majority of them very finely plumose. Endopod of sixth pair in the 

 female (pi. 1, fig. 3d) one-jointed, very small, much less than half as 

 long as the exopod. 



First to fifth abdominal segments (pi. 2, fig. lc) each with the 

 posterolateral angle of the side plates produced into an acute tooth. 

 Third, fourth, and fifth segment each with a considerably raised, 

 sharp median keel, which on the third segment is very high and pos- 

 teriorly produced into a long, compressed, horizontal process; in the 

 fourth and fifth segments the process is small, acute ; the sixth seg- 

 ment has no real dorsal keel, but terminates above in a similar small 

 spiniform process. Posterior margin of fourth and fifth segments 

 armed above with a small, sharp tooth at some distance from the 

 median process. First and second segments dorsally somewhat raised 

 toward the hind margin, and second segment frequently with a more 

 or less distinct, short and low keel. Sixth segment rather long, a 

 little shorter than the sum of the two preceding segments; its lower 

 distal spine is well developed but simple in both sexes. Telson with 

 two pairs of small dorsal spines; it is about as long as the endopod 

 of the uropods which is slightly longer than the exopod. 



The copulatory organs of first pair of pleopods (pi. 2, figs. Id and 

 le) with most parts somewhat elongated. The spine-shaped process 

 {f 1 ) somewhat long and much curved. The terminal process (p 2 ) some- 

 what slender and a little before the middle much curved, tapering 

 at most slightly from the curvature to near the obtuse end. The 

 proximal process (p 3 ), which is somewhat less curved and toward the 

 base a little less thick than the terminal process, is a little longer 

 than the latter, but does not fully reach its distal end; in other 

 respects the shape is rather similar. The median lobe (Zm) is long 

 and rather narrow, with the end comparatively broad and obliquely 

 emarginate; the lateral process (^> 4 ), which originates somewhat 

 before the middle of the lobe and considerably beyond the insertion 

 of the proximal process, reaches to near the end of the lobe and is 

 very long, feebly curved and regularly tapering to its acute end. 

 The auxiliary lobe (lu) is well developed. The setiferous lobe (Is) is 

 rather narrow, with plumose setae along both margins to a short dis- 

 tance from their base. 



Length. — The largest female (from Station 5030) is 30 mm., an 

 adult male 24 mm. long. 



Remarks. — As Prof. Brandt had but poor material of this large and 

 fine species at his disposal, his description and representation are 

 imperfect. But when some later zoologists referred T. longipes 

 as a synonym to T. inermis Kr0yer ( T. neglecta Kr0yer, T. borealis 



