6 Carl Bovallius, 



cal Museum of the University of Upsala, I found six specimens of S. ultra- 

 mariua in comparatively good condition. These are the chief material 

 for my researches on this species. 



All the species of the genus Synopia are closely allied and seem 

 rather to deserve the name of varieties than of species, of so small 

 importance are the characteristics distinguishing them from one another; 

 but as their differences seem to be constant, at least according to mj^ 

 experience, I am bound to describe them as distinct species. 



Synopia. 

 The head is 



produced an- 

 teriorly. The 

 first pair of 

 anteunse are 



shorter than the pe- 

 reion. Femora of 

 the fifth and sixth 

 pairs of pereiopoda 



longer than the pe- 

 reion. Femora of the 

 fiftli and sixtli pairs 

 of pereiopoda .... 



rounded. Fla- 

 gellum of the 

 first pair oian- 

 teniiœ with 



the first joint hairy, 

 the following 



smooth. 1 . S. u 1 1 r a ni a r i 1) a. 



Dana. 



all joints hairy. 2. S caraibica. 



N. Sp. 



more or less rectangular. 



rounded. 



truncate below. 



3. S. angustifrons. 



Dana. 



4. S. Scheéleana. 



N. Sp. 



5. S. gracilis. 

 Dana. 



not produced anteriorly 6. S. orientalis. 



Kossmann. 



1. Synopia ultrain.arina. DANA, 1852. 



PI. I, fig. 1-21. 



Syii. 1852. Synopia ultramarina. DANA. United States Exploring Expe- 



dition. Crustacea, v. 2, p. 995. 

 pi. 68, fig. 6 a— h. 

 1862. „ „ „ Spence Bate Catalogue of the specimens of 



Amphipodous Crustacea of the 

 British Museum, p. 341. pi. 

 54, fig. 1, 1 d, 1 h, 1 i. 



Diagn. Caput trianguläre, longitudine latitudinem sequans. 



Oculi parvi supplementära singuli supra bases antennarum primi paris siti. 

 Antennœ primi pai'is quam pereion multo breviores. Flagellum secundarium 

 longitudine articulum primum flagelli (veri) sequans vel superans. 



