KONGL. SV. VET. AKADKMIENS HANDLINGAK. BAND. 21. N:0 5. 



67 



13. YIBILIA GRACILENTA, C. BOVALLIUS, 1887. 



PI. X, fig. 1—14. 



Diagll. Caput non rostratum, segmenta duo priora pereii longitudine asquans. Oculi grandes. Flagel- 

 lum antennarnm primi paris acutum, capite longius. Pedes pereii curti. Femora pedum 

 primi ac secundi parium angusta. Processus carpi pedum secundi paris latus, fortiter ser- 

 ratus, metacarpum longitudine fere ;equans. Tibia pedum tertii ac quarti parium non 

 tumida?, dactyli modici. Pedes quinti ac sexti parium pedibus tertii ac quarti parium 

 paullo longiores. Segmentum secundum ac tertium nri coalita. Anguli postici segmenti 

 ultimi valde producti, processus telson longitudine aaquantes formant. Pedunculi pedum 

 uri primi ac tertii parium ramis paullo longiores, pedunculus pedum secundi paris ramum 

 internum longitudine aaquans. Telson modicum, rotundatum, dimidio pedunculi ultimi 

 paris pedum uri brevius. 



The head is not rostrate, as long as the first two pereional segments. The eyes are large. 

 The flagellum of the first pair of antenna' is acute, longer than the head. The pereiopoda 

 are short. The femora of the first and second pairs are narrow. The carpal process of 

 the second pair is broad, strongly serrated, almost as long as the metacarpus. The tibia? 

 of the third and fourth pairs are not tumid; the dactyli are rather small. The fifth and sixth 

 pairs are a little longer than the third and fourth pairs. The second and third ural seg- 

 ments are coalesced. The hinder corners of the last segment are strongly produced, 

 forming processes equalling the telson in length. The peduncles of the first and third 

 pairs of uropoda are a little longer than the rami; that of the second pair is as long 

 as the interior ramus. The telson is middle-sized, rounded shorter than half the peduncle 

 of the last pair of uropoda. 



Colour. Yellowish. 



Length. 6 — 7 mm. 



Hab. The Atlantic; captured by D:R Hornbek. (D. M.) 



Sjn. 1887. Vibilia gracilenta, C. BOVALLIUS. »Systematical list of the Araphipoda Hyperiidea». Bih. t. 



K Sv. Vet. Ak. Handl. Bd. 11. N:o 16, p. 9. 



This species is closely allied to the next preceding, differing only in some few 

 characteristics, which are however of such a value that it must be ranged as a species of its 

 own. Through the large eyes it approaches Vibilia macropis, through the urus and the 

 telson it connects Vibilia gracilis with Vibilia armata. 



The body is of the same form as in Vibilia gracilis, but the integument is harder 

 and not hvaline, of a uniform yellowish-white colour without spots. 



The head is not produced into a rostrum; it is as long as deep, equalling the first 

 two pereional segments in length. 



The eyes are very large, almost circular, consisting each of about 70 ocelli. 



The first pair of antenna' (PI. X, tig. 2 and 3) are of the same slender form as 

 in Vibilia gracilis, but the first joint of the flagellum is more than twice as long as the 

 peduncle. The two terminal joints are distinct, carrying some stout hairs. 



