/ 



yg 2 CRUSTACEA. 



Caudal appendages reaching slightly beyond line of abdomen; inner 

 lamella the broader and slightly the longer, broadly rounded at 

 apex ; outer having the external margin much reflexed. 



Plate 52, fig. 9 a, animal, enlarged six diameters ; b, abdomen, more 

 enlarged. 



Nassau Bay, Fuegia. 



Length of body, two and a half lines. The fissure in the extre- 

 mity of the abdomen is of peculiar depth and shape ; the part of the 

 surface of the abdomen anterior to its inner extremity is a little 

 raised, independently of the general globose elevation which charac- 

 terizes the whole segment anterior to this raised point. The minute 

 hairs of the surface and slight granulation, are seen with a lens most 

 distinctly on the caudal segment. 



Spheroma Savignh, Edw. 



Corpus fere Iceve, subtilissime gmnulatum. Thoracis rnargines subtilis- 

 sime et sparsim pubescentes. Segmentwm abdominis posticum subtri- 

 angulatum, latitudine non longius, parte versus rnargines exceptd valde 

 tumidum, apice emarginato, emarginatione simplice, paulo oblongd. 

 Antennae 2dce flagello 10-12-articulato ; lmce flagello 7-%-articulato. 

 Styli caudales dbdomine vix breviores, lamellis extremitate late rotumr 

 datis, externa breviore vix angustiore. 



Body nearly smooth, very minutely granulous. Margin of thoracic 

 segments minutely and sparingly pubescent. Posterior abdominal 

 segment somewhat triangular, about as long as broad, very tumid, 

 excepting parts towards margins; at base much narrower than 

 thoracic segment, near apex pubescent, sides arcuate, apex emar- 

 ginate, emargination small, a little oblong. Second antennse having 

 the flagellum ten-jointed; flagellum of first pair seven-jointed. 

 Caudal stylets scarcely shorter than abdomen; lamellas broadly 

 rounded at extremity, or subtruncate; outer the shorter; both 

 entire. 



