239 



of the head. Antennae I have a highly developed, flattened or bulged 

 1st segment of the flagellum and a few rudimentary distal segments. 

 Antennae II are thin and inserted on the head frontally; in length, they 

 are comparable to antennae I. The mandibles have a well-developed palp, 

 denticulate cutting edge and strong dentate process. Maxillae I have a 

 well-developed outer lobe while the inner lobe is in the form of a small 

 round process without ornamentation or is absent. Maxillae II are small 

 and have two short lobes. The maxillipeds have completely fused inner 

 lobes forming a single medial lobe. 

 199 The somites of the pereon are free. Pereopods I-II are shorter than 



the remaining ones. Pereopods I are simple (except in Cyllopus lucasi). 

 Pereopods II are chelate (except in Vibilia bovallii, in which they are 

 simple). 



Pereopods V-VI are the longest. The 2nd segment of pere- 

 opods V-VII is broadened, particularly in pereopods VII. Pereopods VII 

 have a modified 7th segment (finger-shaped, clavate or knife-shaped). 

 The gills are located on somites II-VI of the pereon and the oostegites 

 on somites II-V. The somites of the pleon are massive and their height is 

 more than the height of the somites of the pereon. The border between the 

 fused urosomites II-III is marked by lateral notches and a dorsal furrow. 

 The uropods have free rami. The telson is shorter than uropods III. 



The family includes three genera. 



KEY TO GENERA OF FAMILY VIBILIIDAE 



1. Eyes occupy entire surface of head. First segment of flagellum of 

 antennae I clavate, with bulged proximal part and stretched distal 

 part 3. Cyllopus Dana. 



— Eyes (if present) oval or pyriform, lateral on head. First segment of 

 flagellum of antennae I flattened laterally 2. 



2. Mandibles with simple, conical masticatory process; distal segment 

 of palp shorter than preceding segment. Maxillae I without inner 

 lobe. Maxillae II greatly reduced or absent 2. Vibilioides Chevr. 



— Masticatory process of mandibles with flat tubercular surface; dis- 

 tal segment of palp longer than preceding segment. Maxillae I with 



roundish inner lobe. Maxillae II normally developed, bilobed 



1. Vibilia M.-Edw. 



1. Genus Vibilia Milne-Edwards, 1830 



Milne-Edwards, 1830: 386; Stebbing, 1888: 1270; BovaUius, 1887b: 43; 

 Vosseler, 1901: 118; Behning, 1912: 212; Stephensen, 1918: 32; Bowman 

 and Gruner, 1973: 24. 



