287 



the head; the 1st segment of the base is equal in length to the next two 

 segments together; the flagellum is three time longer than the antennal 

 base, lanceolate, and anteriorly acute. Antennae II are thin, not longer 

 than antennae I, shifted backward, and extend to somite III of the pereon. 

 236 The pereon is longer than the pleon, the first two somites approxi- 



mately equal in length, each slightly shorter than somite III, with somite 

 IV the longest. The pereopods are short and without pubescence. Pere- 

 opods I-II are thin and short. The 5th segment of pereopods II has a 

 process. Pereopods III-IV are approximately equal in length, their 4th 

 segment not broadened. Pereopods V-VI are slightly longer than the 

 preceding ones and have an ovally broadened 2nd segment. Pereopods 

 VII are short. The last pair of uropods does not extend beyond the end 

 of pairs I-II. The telson is small, squamiform. 



Notes: In the brief description of the species the author makes no 

 mention of the shape of the last segment of the urosome, i.e., whether 

 its lateral angles project backward or not. However, very short uropods 

 III are common for the group of species in which the angles of the last 

 urosomite project. Therefore, this species has been tentatively placed in 

 this group in the identification key. 



Distribution: Only one specimen is known, which was caught near 

 Jave. 



Absent in our collections. 



2. Genus Vibilioides Chevreux, 1905 



Chevreux, 1905b: 1; 1935: 176; Stephensen, 1918: 56. 



In external appearance these crustaceans are close to Vibilia. The 

 body integument has transverse folds on the somites, which are raised 

 on the sides of the pereon above the bases of the coxal plates in the 

 form of low longitudinal crests, modifying into a chitinous ridge on the 

 pleon that continues onto urosomite I. The head is small, slightly shorter 

 than somite I of the pereon. The antennae are similar in structure to 

 Vibilia. The mandibles and maxillae are reduced and the dentate process 

 of the mandibles is in the form of a simple conical projection without 

 a masticatory surface. Maxillae I are devoid of an inner lobe. Maxillae 

 II are either absent or "so reduced that they were not observed during 

 dissection of the crustacean" (Chevreux, 1935). Broadening of the 2nd 

 segment in all pairs of the pereopods is characteristic, the broadening 

 being significant in pereopods I-II. Pereopods VII have five segments; 

 the three distal segments are reduced and together constitute less than 

 half the length of the 2nd segment. The epimeral plates of the pleon are 

 posteriorly acute. Complete fusion of urosomites II and III is noticed 

 only in the middle of the dorsal side and the lateral borders between 

 them are well demarcated and slightly extend over the dorsal surface. 



