CHRISTIANIA VIDEXSK.-SELSK. FORHANDL. 18 83. No. 7. 



2 :» 



margin with numeruus curved spines. Last joint of 7th pair of 

 legs scarcely half the length of the preceeding joint. Telson 

 rather narrowed posteriorly, apex bhmtly lanceolate, subapical spi- 

 nes elongated and smooth. Uropods almost reaching the tip of 

 the telson. inner lamella very slightly snrpassiug the outer. Length 

 of the adult male: 17 mm. 



Hab: Australian sea (Bass Strait, Port .Jackson, Cape Hovve). 

 surface; rather plentiful. 



(nu. 4. Thysanoéssa Brandt 1851. 



Middendorfs Sibirische Reise. Zool. 



Gencric Charactcrs. Body rather tapering posteriorly. Cara- 

 pax short. distinctly rostrate, antero-inferior angles much produced. 

 Eyes of somewhat, irregular shape; upper part of the cornea more 

 or less distinctly narrowed. Flagella of both pairs of antennæ 

 very short. Anteimular peduncle with the basal joint flattened. 

 without any dorsal lappet, two last joints narrow and elongated. 

 Terminal joint of 2nd pair of maxillæ not very large, exterior 

 plate in both pairs of maxillæ well developed. First pair of legs 

 rather small and narrow; 2nd pair very strongly developed, much 

 larger than any of the others, geniculate, third joint very much 

 elongated and almost nacked, 5th joint compressed and provided 

 on both margins with strong ciliated setæ, last joint very short 

 and armed with curved spines. Subsequent pairs of legs rapidly 

 diminishin<>- in size, and of the usual form. 7th pair of legs very 

 small, the stem biarticulate. exopodite distinct. Last pair of legs 

 quite rudimentary, only forming a small inarticulate setigerous 

 plate (exopodite). 3 posterior pairs of brauchiæ complex. Inner 

 lamella of the two anterior pairs of pleopoda in the male modified 

 in the usual manner. Phnsphorescent spherules as in Euphausia. 



EemarJcs. This genus, the most marked feature of which is 

 the strong development of the 2nd pair of legs, has been establis- 

 hed by Brandt for the reception of an arctic species from the Sibirian 

 sea, Th. longipes. I have described 1 two species from the Nor- 



1 G. 0. Sårs, Oversigt over Xorges Crustaceer. I. 



