(iAMMAKin.K. »il 



flagellum. ajid nearly twice a.s long as base of .superior pair ; 

 joints of riagellum oblong, nearly naked. First pair of gnathopoda 

 furnished with a propodos, which is oblong, arcuate above, and 

 rather more so below ; the palm nearly longitudinal, and not 

 excavate. The propodos of second pair of vcrj- unasual magnitude, 

 oblong ; margins nearly parallel ; an obtuse tooth at the lower 

 apex ; dactylos long and stout. Thii-d, foiu'th, and fifth pairs of 

 pereiopoda subequal, the third smallest ; bases broad, meros rather 

 broad, the carpus and propodos rather narrow ; setae exceedinglj- 

 short, not one-foiu'th as long as breadth of joint. 



" Fennile. — Base of second antennae as long as the flageUum. Second 

 pair of gnathopoda having a stout propodos, which is oblong, 

 arcuate below, with the palm nearly straight, and armed with a 

 small tooth towards the apex. 



" Length three to foiu- lines. 



" ffab. Rio Janeiro." — Dana. 



2. Stenothoe clypeatus. (Plate IX. fig. 7.) B.M. 



Stenothoe clypeata, Stimpson, Mar. Invert, of Grand Manan, p. 51. 



Eyes round. Superior antenna) shorter than the inferior. Inferior 

 antennae ha\'ing the peduncle rather longer than the superior 

 antennae ; flagellum not longer than the last articulation of the 

 peduncle. Fii'st pair of gnathopoda having the propodos ovate ; 

 palm not defined. Second paii* of gnathopoda having the supe- 

 rior margin of the propodos arcuate ; palm near the base of the 

 dactylos denticulated, not oblique ; towards the inferior angle 

 deeply excavate, the concave margin ninning parallel with the 

 superior margin ; the inferior angle of the palm produced into a 

 long sharp tooth, the inferior margin very short. 



Length half an inch. 



Hub. Grand Manan (Stimpson). 



The specimen from which the above description is taken was 

 forwarded to me by the author of the species. 



b. Superior antennce without an appendage; vmndibles tvith an 

 appendage; posterior pleopoda double-branched. 



4. PLEUSTES. 



Pleufttes, Spmce Bate, Ann. Nat. Hint. ser. 3. vol. i. p. 362, 1858. 

 The antenna) simple. Coxae of the two paiis of gnathopoda and the 

 two anterior pairs of pereiopoda very largely developed. Coxa 



