Amphipoda Synopidea. 19 



Peduuculi pedum plci in apice truucati. 

 Segmeutuin priimim iiri seciiudo plus quam cluplo longius. 

 Rami ultiiui paris pedum uri lougitudiue sequales. 

 Telson obsoletimi. 



The head is triangular, as broad as long. 



Secondary eyes are wanting. 



The first pair of antennce are much longer than the pereion; the 

 secondary flagellum equals the length of the first joint of the true flagellum. 



The first pereional segment is shorter than the second; the sixth 

 is as long as the seventh. 



The femora of the fifth and sixth pairs of pereiopoda are not 

 rounded, but truncated below. The seventh pair equal the length of the sixth. 



The peduncles of the pleopoda are truncated below. 



The first ural segment is more than twice longer than the second. 



The rami of the last pair of uropoda are equal in length. 



Telson obsolete. 



Dana proposed the above quoted name for the animal, but he thought 

 that it might possibly prove to be the male of S. ultramarina. As I 

 have got males among the specimens, which I have identified with Da- 

 na's S. ultramarina, I must retain the name of Dana, allowing that the 

 animals are closely allied. 



»The body is more slender than in S. ultramarina, and has no 

 convexity along the back.» 



»The excavation in the lower part of the head, from which the 

 antennœ proceed is very large, being as broad as the part af the head 

 immediately above.» 



»The superior antenuse are sparingly shorter than the body; fla- 

 gellum of the inferior pair scabrous.» 



Colour. »More or less entirely ultramarine.» »The blue colour 

 was deepest along the venter. The four anterior legs 

 and the bases of the superior antennae had the same 

 rich blue colour.» 



Length. 6 m.m. 



Hab. The Atlantic: »Lat. 8°— 12" S. and Long. 11°— 14n5' 

 W:; also Lat. 4°— 7« S. and Long. 21"- 25° W.» 



