26 G. O. SARS. PRELIMJNARY NOTICES ON THE SCHIZOPODA. 



wegian coast, Th. borealis and Th. tenera, and in the 'Challenger' 

 collection are two additional species from the southern hemisphere r 

 to be described below. 



2U. Thysanocssa gregaria n. sp. 



Form of body rather short and stout. Carapax with a small 

 lateral denticle at the posterior part of the inferior margin; ro- 

 strum produced, straight, keeled above and somewhat flattened at 

 the sides, apex lanceolate. Postabdominal segments slightly com- 

 pressed, with rounded epimera. Last segment somewhat longer 

 than the preceeding, præanal spine rather large and densely ser- 

 rated at the posterior margin. Eyes very large and massive, 

 irregularly globose, the cornea distinctly contracted above. Anten- 

 nal scale surpassiug the 2nd joint ot the antennular pedimcle, 

 oblong, slightly curved, tapering anteriorly, apex obliquely rounded, 

 outer edge prominent. 2nd pair of legs, when extended, exceeding 

 half the length of the body, third joint reaching the tip of the 

 antennular pedimcle. Telson with two pairs of dorsal denticles, 

 apex acuminate, subapical spiues smooth. Inner lamella of the 

 uropods only slightly surpassing the outer, and not quite reaching 

 the tip of the telson. Length: is mm. 



Hab. South Atlantic on several places (rather plentiful at 

 Stat, 331 & 332), Subantarctic ocean (South of Cape of Good Hope 

 and Australia), Pacific; surface. 



30. Thysanocssa macrura n. sp. 



Form of body rather more slender than in the last species. 

 Carapax with a single lateral denticle placed as in Th. gregaria; 

 rostrum shorter, triangular, very slightly keeled above, apex acute. 

 Postabdominal segments almost cylindric, with very small epimera. 

 Last segment very mach elongated and narrow, as long as the 

 two preceeding together; præanal spine simple, ungviform. Eyes 

 somewhat smaller than in the last species, but of a similar form. 

 Antenna! scale considerably surpassing the 2nd joint of the an- 

 tennular pedimcle, very narrow, sublinear, apex obtusely truncated. 



