6 Carl Bovallius, 



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

 marina 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 bo constant, at least according to my 

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



Synopin. 

 The liead is 



produced an- 

 teriorly. The 

 first iiair of 

 aiitennaj are 



shorter than the pe- 

 reion. Femora of 

 the fifth and sixth 

 pairs of jiereiopoda 



longer than the pe- 

 reion. Femora of the 

 fifth and sixth ])airs 

 of pereiopoda .... 



rounded Fla- 

 gellum of tiie 

 first pair ol an- 

 tenna; witli 



the first joint hairy, 

 the folio winy 



.smooth. 



1. S. ultramarina. 

 Dana. 



(ill joints hairy. 2. S caraibica. 

 N. Sp. 



more or less rectangular. 



rounded. 



truncftte below. 



3. S. angustifrons. 



Dana. 



4. S. Scheeleana. 



N. Sp. 



5. S gracilis. 

 Dana. 



not produced anteriorly 



6. S. oriental is. 

 Kossmann. 



1. Synopia ultraniariiia. DANA, 1852. 



PI. I, fig. 1-21. 



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



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

 pi. 68, fig. 6 a— h. 

 1862. „ ,, ,, Spence Kate. Catalogue of the specimens of 



Anipliipodous Crustacea of the 

 British Museum, p. 341. pi. 

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



Diagn. ('((j)//l Iriangulare, longitiulinc latitiuliuem aMjuans. 



Or/i/i parvi supplcinentarii singuli supra bases antennarum primi ]>aris siti. 

 Anfriiine primi ])ans (luain pcroioii niulto brcviorcs. Flagclliini sccundariiiin 

 loiigitudinc articuhuu prinmin flagelli (veri) ae(pians vcl superaiis. 



