Amphipoda Synopidea. 5 



Diagn. Corpus compressum, gracile. 



Caput angustiuu, triaugiüatuin. 



Ociili grandes, iu medio capitis coufluentes, ocellis magnis. 

 Aiiteiince primi paris flagcllo niiüti-articulato, articido primo valde elongato, setoso. 

 Pedes pereii parium qiiattuor priorum iuaîcpiales, setosi; illi pariuni tri mil ulti- 

 monim elongati, subœqiniles, dactylis longis. 

 " Pedes iiri ultimi paris ramis extei'nis bi-articulatis. 

 Telson maximum. 



The hodij is compressed. 



Tiie head is narrow, triangular. 



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



distinct large ocelli. 

 The first pair of antenna' with a midti-articulate flagellum; the first joint of 

 • the flagellimi very long, beset with loug hairs. 

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



subequal, elongate, with long dactyli. 

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

 The telson is very large. 



The genus vSynopia 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. ultramariua. 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. ultraniarina and S. angustifrons^ 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; lie 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. ultramariua, 

 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. 

 ultramariua 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) In the Swedish vessel Monarch, belonging to Consul Rettig of Gefle, who iu 

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



