Amphipoda Synopidea. 5 



Diagn. Corpus compressnm, gracile. 



Caput angustiini, triangnlatiim. 



OcuU gvandos, in medio capitis conflnente.s, oocUis niagnis. 



AiiteniKC j)rimi i)aris lla<;('ll() iniilli-articulato, articiilo jtrimo valde elongato, setoso. 



Pedes percii pai'iuni (|iiallii(>r pi-ioniin in;e(pialcs, sctosi ; illi [)ariiim triiiin iilti- 



moriim clongati, siil)aM|iialos, dactylis longis. 

 Pedes iiri idtiini paris raniis externis bi-articulatis. 

 Telsoii ina.xiimnn. 



The hodtf is compressed. 



Tlie I/ead is narrow, triangular 



The eyes are very h\rge, coalesced into one in the middle of the head, with 



distinct large ocelli. 

 The first pair of aiitnnuc with a multi-articulate flagellum; the first joint of 



the flagellum very long, beset with long hairs. 

 The first four pairs of pereiopoda are unecpial, setose; the three last ones 



subequal, elongate, with long dactyli. 

 The last pair of uropoda with the outer rami bi-articukite. 

 The telson is very large. 



The genus Synopia was established in the year 1852 by Dana 

 upon specimens captured in the tropical seas during the United States 

 Exploring Expedition 1838 — 1842. He distributed them into two 

 or rather three species, S. ultramarina^ S. angustifrons and S. gracilis, the 

 last one only conditionally, supposing that it might perhaps prove to 

 be the male of S. ultramarina. Judging from the descriptions and 

 drawings of Dana, compared with the alcohol-specimens of S. ultra- 

 marina at my disposal, I think they are different species and shall 

 retain the name proposed by Dana. Spence Bate cites the two 

 species S. ultramarina and S. angustifrojis^ with short extracts from 

 Dana's descriptions and copies of some of his figures. In the year 

 1880 R. KossMANN described some details of a Synopia from the 

 Red Sea; he proposed for it the name S. orientalis. During the expe- 

 dition of His Swed. Maj:s Corvette Balder, 1881 — 82, I cap- 

 tured four specimens of a new species and one of S. ultramarina, 

 some twenty miles off the East coast of Barbadoes; and in the Carib- 

 bean Sea one specimen of another new species, closely allied to S. 

 ultramarina and S. gracilis. Last year, in a very valuable collection of 

 Hyperids and other pelagic Crustacea, made by Captain George von 

 Scheele during a voyage round the world') and presented to the Zoologi- 



1) 111 the Swedish vessel Monarch, belonging to Consul Rettig of Gefle, who in 

 the kindest manner supported the zoological labour of Captain von Scheele. 



