REPORT ON THE AMPHTPODA. 799 



Genus Synopia, Dana, 1852. 



1852. Synopia, Dana, Amer. Journ. Science and Art, ser. 2, voL xiv. 

 1852. „ Dana, U. S. Explor. Exped., voL xiii. pt. 2, pp. 981, 994. 

 1862. ,, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 341. 

 1880. ,, Kossman, Zool. Ergeb. Kii.st. des rothen Meeres, p. 137. 

 1886. „ Bovallius, Amph. Synopidea, p. 4. 



For the original definition of the genus, see Notes on Dana, 1852 (pp. 259 and 268). 

 Bovallius defines the genus thus : — 



" The body is compressed. 



" The head is narrow, triangular. 



" The eyes are very large, coalesced into one in the middle of the head, with 

 distinct large ocelli. 



" The first pair of antennas with a multiarticulate flagellum ; the first joint of the 

 fiagellum very long, beset with long hairs. 



" The first four pairs of pereiopoda [first and second gnathopods and first and 

 second perseopods] are unequal, setose, the three last ones subequal, elongate, with long 

 dactjdi. 



" The last pair of uropoda with the outer rami biartieulate. 



" The telson is very large." 



The size of the telson, however, seems scarcely suited for a generic character, since 

 in Synopia scheeleana, Bovallius, the telson is of no great comparative size, and in 

 Synopia gracilis, Dana, Bovallius himself describes the telson as " obsolete." 



Synopia scheeleana, Bovallius, 1886 (PI. LIL). 



1886. Synopia Scheeleana, Bovallius, Amphipoda Synopidea, p. 16, pi. ii. figs. 22-29. 



Head as long as the first three segments of the perseon, rostrum or front of the head 

 bent down at a right angle to the dorsal line, both this front and the whole dorsal line of 

 the annual being sharp-edged ; the segments of the perseon short, the first three of the 

 pleon long and large, the fourth as long as the fifth and sixth united ; the first three 

 segments of the pleon postero-laterally angled, but not sharply. 



Eyes large, oval, meeting at the top of the head, set diagonall}' across the top front 

 corner of the head. The colour dark in the preserved specimens. Underneath the large 

 eyes, in more or less close proximity, but externally quite distinct, there are two small 

 ones of a few (seemingly four) ocelli. 



Upper Antennae. — First joint bulbous, as broad as long; second much shorter and 

 narrower than the first, and the third than the second ; flagellum with ten joints 



