CmtlSTIAMA VIDENSK.-SKI.SK. I OKHANDL. 1883. No. 7. 



41 



Hab. North- and South-Atlantic. Pacific, at many different 

 places; siirface. 



RemarJcs. 1 cannot doubt, that all the fonns, described under 

 the different names referred to above. belong to one and the same 

 species, and that this is the <»ne. first described by V*. Thompson as 

 Cynthia. It is a widely distributed pelagic species. 



51. Siriella gracilis Dana. 



Siriella (/racilis, Duna. United States Explor. Exped , Vol. XIII. Crustacea, 

 pg. 658, pl. 44, fig. 1, a — g. 



Hal'. Pacific ocean. A ra fu ra sea. Celebes sea : surface. 



Gen. s. E u c h æ t om e ra n. 



Gener ie characters. Carapax deeply emarginated posteriorly, 

 rostral projection slight. Eves of somewhat irregular shape, the 

 cornea being contracted in the middle. Antennular peduncle of 

 moderate size. and in the male provided with a distinct hairy lobe 

 beneath the flagella. Antennal scale relatively short, with the outer 

 margin nacked. and produced in a conspicuous spine. inner margin 

 and apex with very long aml strong setæ. Legs rather elongated, 

 and provided with stnmg sota', terminal portion 3-articulated, apical 

 claw well marked. Marsupial poche in the female of the same 

 structure as in Jlysis. Pleopods in the female simple, but rather 

 large, laterally extended, and provided with very strong marginal 

 setæ; in the male biramous and natatory. Telson unusually short, 

 lamelliform, rounded, apex truncated. and provided in the middle 

 with two very long eiliated seta'. Uropods with much elongated and 

 narrow lamellæ, clothed all around the margins with very long and 

 strong seta-. Auditory organ at the base of the inner lamella 

 distinctly developed. 



Rcviarks. This new genus may readily be known by the very 

 short lamelliform telson. somewhat, agreeing in form with the same 

 in the genus Eryihrops, as well as by the very strong setæ on the 

 legs. pleopoda, uropoda and antennal scales. The two species. charac- 

 terised below, have not been quite satisfactorely examined, owing 



