EEPORT ON THE AMPHIPODA. 1285 



Pleopiods. — The joints of the rami numbering from ten to eleven. 



The Telson small, nearly circular, but flattened at the base. 



Length. — The specimen, with the after part of the pleon flexed, measured a fifth of an 

 inch. 



Locality. — The single specimen, a male, was taken at the surface in the South Atlantic, 

 on the night of October 5, 1873. 



Remarks. — The specific name is taken from the first part of the name of the distin- 

 guished French naturalist, the second part of his name having been applied to another 

 species in this genus. The species differs from Vibilia macropis, Bovallius, which is also 

 from the South Atlantic, by the smaller size of the eyes, by the flagellum of the upper 

 antennae not being " elongate lanceolate," and by the rami of the uropoda being much 

 serrate, and in the second and third pairs not equal. It has a shorter telson than 

 Vibilia gracilis, Bovallius, from the Pacific, though it agrees with that species in having 

 a round telson and in some other noticeable characters. 



Vibilia sp. (PI. CXLVIIIb. figs. C, D). 



Eostrum minute, back smoothly rounded. 



Eyes oval, the lower end the smaller. 



Upper Antennse. — The distal end of the large flagellum joint a little narrowed. 



Lower Antennw. — Two stages of the development of the flagellum are shown in the 

 figures a.i. C. and a.i. D. respectively. 



Mouth Organs differing little from those of Vibilia propinqua. In the molar 

 tubercle of the mandible the teeth along the flattened side of the crown were here 

 observed to be long and slender, and apically bidentate or tridentate. 



First Gnathopods nearly as in Vibilia propinqua, but the wrist scarcely so long as 

 the hand, and with only one spine on the apex of the hind margin. 



Second Gnathopods. — The third joint has seven spines on the hind margin, six on 

 the apical margin, all with sharp tips, the front spine much the smallest. 



Perseopods like those of Vibilia propinqua. In the fourth pair the fourth joint has 

 seven spines on the front margin, and in the fifth pair the first joint is rather more 

 widely expanded than in the species compared. 



Uropods. — In one specimen the inner ramus of the third pair was considerably longer 

 than the outer ramus, see fig. ur.3. C, but in another specimen the difference was less. 



Length, from the front of the head to the back of the second segment of the pleon, 

 three-tenths of an inch. 



Locality. — " March 10, 1876, South Atlantic, surface." Lat. 37° 29' S., long. 27° 

 31' W. Six specimens. 



