Amphipoda Synopidea. ? 



Segmentum priinnm pereii secundo lougius, segmentum sextum septimo lou- 



gius, omnium longissimnm. 

 Femora parinni quinti et sexti pedum pereii rotundata, fere circularia. Pedes 



septimi paris illis sexti breviores. 

 Peduuculi pedum plei elliptici. 

 Segmentum primum iiri seeundo panlo longius. 

 Rami paris ultimi pedum uri longitudine inaequales, parte inferiore solum 



marginis iuterioris setis iustructa. 

 Telson trianguläre, apice truncate. 



The head is triangular, as broad as long. 



There is a small secondary eye on each side, at the bases of the 

 first pair of antennae. 



The first pair of nntennce are mneh shorter than the pereion ; 

 the secondary flagellum as long as or longer than the first joint of the 

 true flagellum. 



The first segment of the pereion is longer than the second; the 

 sixth is longer than the seventh, being the longest of all. 



The femora of the fifth and sixth pairs of pereiopoda are rounded, 

 nearl_y circular. The seventh pair are shorter than the sixth. 



The peduncles of the pleopoda are elliptical. 



The first ural segment is only a little longer than the second. 



The rami of the last pair of uropoda are unequal in length, with 

 the lower part only of the inner margin provided with hairs. 



The telson is triangular, truncated at the hinder end. 



There are some details in the drawings, given by Dana, which do 

 not agree with mine, but I think it best to try to identify my specimens 

 with the species of Dana, because in my opinion they agree in the 

 more essential characteristics. 



The body is stronglj^ arched, with a thin hyaline integument, and 

 agrees well in general habitus with the figure of Dana's S. ultramarina. 



The head is triangular, seen from the side, even as from above, 

 with two slight excavations for the insertion of the antennae. It is smaller 

 than in the following species, a little shorter than the first three pereio- 

 nal segments, not deeper than the pereion. 



The median eye is round, composed of large ocelli, provided with 

 distinct light-breaking elements. The number of peripherical ocelli is 

 about twenty-four, not very distinct at the hinder margin. Over the bases 

 of the first pair of antennœ there is on each side a little secondary 



