KONGL. SV. VET. AKADEMIENS HANDLINGAK. 



BAND. 



21. n:o 5. 



67 



13. VIBILIA GRACILENTA, C. BOVALLIUS, 1887. 



Pl. X, fig. 1—14. 



DiagU. Capiil non lostratuni, segmeuta duo piiora peieii longitudine aequans. Oculi grandes. Flagel- 

 ]um untdniianim prinii paris aciituin, capite longius. Pedes pereii eurti. Femora pedum 

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

 ratiis, metaearpuii) longitudine fere <equans. Tibia; pedum tertii ac quarti parium non 

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

 paullo longiores. Segmentum secundum ac tertium m-i coalita. Anguli postici segmenti 

 idtimi valde producti, processus felsou longitudine ;B(juantes formant. Pedunculi pedwn 

 nvi primi ac tertii parium ramis paullo longiores, peduncuhis pedum secundi paris ramuui 

 internum longitudine »quans. Tehon niodicum, rotundattnn, dimidio pedunculi ultimi 

 paris pedum uri brevius. 



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

 The flagellum of ihe first pair of anteinuu 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 tibias 

 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 fouj'th pairs. The second and third iifd seg- 

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

 forming processes ei[ualling the telson in length. The peduncles of the iirst and third 

 pairs of uropoda are a little longer than the rami: tluil of the second pair is as long 

 as the interiör ramus. The tchun is middle-sized, rounded shorter than hajf the peduncle 

 of the last pair of uropoda. 



Colour. Yellowish. 



Length. 6—7 mm. 



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



Syn. 1887. VUnlia i/radleuta, C. BOVALLIUS. »Systematical list of the Amphipoda Hyperiidea». Bih. t. 



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



This species is clcselv iilliecl to the iie.xt preccding, difteviiig only in soine few 

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

 own. Through the large eves it approaches Vihilia macropiy. through the urus and the 

 telson it coniiects Vibilia <jradiis witli Vihilia armata. 



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

 and not hyaline, of a uniform yellowish-white colour without spöts. 



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

 two pereional segments in length. 



The eyra are very large, almost circular, consisting eacli of about 70 ocelli. 



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

 in Vibilia (/raciliv, but the tirst joint of the flagellum is more than twice as long as the 

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



