726 CRUSTACEA. 



Length, half an inch. The joints of the thorax have the segments 

 flexed backward on either side. The last abdominal segment is not 

 narrow oblong, as in the scaler. The stylets are about half as long as 

 the abdomen. The under surface of the anterior legs of the first and 

 second pairs especially, are thickly set with spines, which are partly 

 laminated, and have a ragged edge. The extremity of the flagellum of 

 the antennse consists of two or three small joints, the last of which is 

 slender and setulose at extremity. 



PORCELLIO? FUEGIENSIS. 



Abdomen thorace subito pernio angustius. Caput antice bene prceruptum, 

 processu antero-laterali parvulo, subrectangulato, fronte sahente fere 

 rede transverso. tegmenta thoracis partim rugato-granulata, abdo- 

 minis subtilissimt granulata, Mium/ltum, Uumque latere paulo ex- 

 pansa et salientia, ultimum triangulatum, paulo transversum, paulo 

 concavum, basin stylorum vix superans; ramo stylorum interno longt 

 saliente et hirsutiusculo, externo dimidii abdominis longitudine. 



Abdomen abruptly a little narrower than thorax. Head anteriorly 

 with an abrupt vertical surface and acute edge above, anterolateral 

 process very small and subrectangular, front salient, nearly straight 

 transverse. Segments of thorax in part rugato-granulate ; segments 

 of abdomen very finely granulate, third, fourth, and fifth laterally 

 expanded and salient, last triangular, somewhat transverse, and 

 above concave, hardly projecting beyond base of stylets; inner 

 branch of stylets long salient, and short hirsute; outer branch half 

 as long as abdomen. 



Plate 47, fig. 8 a, animal, enlarged; b, part of body, with the pos- 

 terior abdominal segments bent on either side as in some preserved 

 specimens; c, extremity of abdomen; d, extremity of posterior legs. 



Near Nassau Bay, Tierra del Fuego. 



Length of body, four lines. The projection of the inner branches 

 of the stylets is a striking character, since they are in sight from above 

 nearly their whole length, and extend one-third of the distance to the 



