268 



rounded apex, sometimes almost round and extends up to the middle of 

 the basipodite of uropods III. 



Distribution: A sparsely populated species widely distributed in the 

 North Atlantic, up to 60° N. It is also known from the Mediterranean 

 Sea, region of the Moluccas Islands and the Sulu Sea. In the Pacific 

 Ocean it is found in the region of New Zealand (farther north of the 

 Subtropical Convergence) and in the southeastern part of the tropics of 

 the Pacific Ocean. 



9. Vibilia chuni Behning and Woltereck, 1912 (Fig. 109) 



Behning and Woltereck, 1912: 8; Behning, 1925: 495; Barnard, 

 1930: 405.— hodgsoni Stewart, 1913: 248. 



Length up to 7.5 mm. 



The head is without a rostrum, its height more than its length, and 

 equal to the length of the first two somites of the pereon. In males the 

 head sometimes projects roundly over the base of antennae I. The eyes 

 are small, in males occupying up to 1/4 the lateral surface of the head, 

 but in females less. The base of antennae I is short; the 1st segment 

 of the flagellum is broad, its width more than half the height of the 

 head, the upper and lower margins parallel; the flagellum is obliquely 

 truncated anteriorly; the highly reduced 2nd segment of the flagellum is 

 situated apically in a notch and bears two setae. Antennae II in females 

 are five-segmented and shorter than antennae I; in males they are seven- 

 segmented and equal to antennae I in length. The maxillipeds have lance- 

 olate outer lobes, each with three-four spinules along the outer margin 

 and eight-nine spinules on the surface; the medial lobe is low, not extend- 

 ing to the middle of the outer lobes; the distal margin is straight and in 

 males has a central prominence. 



Somite I of the pereon is half the length of somite II, while somites 

 IV-VII are about equal in length. The 2nd segment of pereopods I is 

 equal in length to the rest of the leg and its anterior margin convex in the 

 middle; the 5th and 6th segments are equal in length, the posterior margin 

 of the 6th segment is straight and denticulate; the claw is half the length 

 of the 6th segment. Pereopods II are barely longer than pereopods I; the 

 2nd segment is equal in length to the rest of the leg; the 5th segment 

 is longer than the 6th and its process extends to the middle of the 6th 

 segment; six strong setae occur in the distal part of the posterior margin of 

 the 4th segment; the posterior margin of the 6th segment and the margins 

 of the process facing it are denticulate. Pereopods III-IV are identical 

 except that the IV are slightly longer. The 2nd segment of pereopods III 

 has barely convex margins. In pereopods FV the 2nd segment is almost 

 linear; the 4th segment is equal to the 6th in length, the 5th segment 

 slightly shorter; the 6th segment has very minute setae along its posterior 

 margin; the claw is strong, almost straight, and 1/3 the length of the 6th 



