272 AMrnrpoDA nokmalia. 



2. Naenia rimapalma, n. s. (Plate XLVI. tig. 3.) B.M. 



Eyes round, black. Superior antenna? two-thirds the length of the 

 animal. Inferior antenna? a little longer than the superior, peduncle 

 reaching beyond the peduncle of the superior. First paii- of gna- 

 thopoda slender ; carpus as long as the propodos ; propodos having 

 the margins parallel, vrith no defined palm ; dactj-los as long as 

 the propodos. Second pair of gnuthopoda ha\-ing the carpus short ; 

 propodos large, long-quadrate ; palm oblique, imperfectly defined, 

 having a deep central excavation, margin fringed with small bead- 

 like protuberances ; dactylos ha%-ing an enlargement opposite the 

 hollow in the palm. Pereiopoda subequal. Pleopoda subequal, 

 the longest ramus tipped with a long cilium. TeLson tubular, 

 tipped with one or two minute denticles (microscopic). 



Length -^ths of an inch. 



Hab. Coast of Northumberland (Mr. Aider). 



3. Naenia excavata, n. s. (Plate XLYI. fig. 4.) B.M. 

 Female. — Eyes small, ovate. Antennae (wanting). First pair of 



gnathopoda long and slender; carpus as long as the propodos; 

 propodos but slightly broader at the palm than at the carpal 

 extremity, not stouter than the caqms ; palm obhque, short, and 

 defined by an obtuse angle with the inferior margin ; dactylos 

 long, as long as the propodos, serrated on the inner margin. Se- 

 cond pair of gnathopoda large, robust, having the carpus short, 

 and produced along the inferior margin of the propodos ; propodos 

 ovate, palm oblique, defined by a right angle which is suddenly 

 foi-med by a deep excavation in the inferior limits of the ])alm ; 

 dactylos as long as the palm, serrated upon the inner margin. 

 Posterior pleopoda not longer than the preceding. Telson cylin- 

 drical, carrying at the extremity two or thi'ee exceedingly minute 

 denticles (microscopic) and a few haii's. 

 Length i^ths of an inch. 



Hub. Coast of Northumberland {Mr. Alder). 



4. Naenia undata, n. s. (Plate XLYI. fig. 5.) 



Eyes round. Superior antennte half the length of the animal. Inferior 

 antennae not longer than the superior. First pair of gnathopoda 

 having the carpus as long as the propodos ; propodos ovate, taper- 

 ing ; palm very oblique, imperfectly defined, ciliated; dactylos 

 internally serrated. Second pair of gnathopoda having the carpus 

 shorter than the propodos, and produced along its inferior margin ; 



