752 CRUSTACEA. 



broad as long. The posterior epimerals are smaller than the ante- 

 rior. 



Genus CERATOTHOA, Dana. 



Cymothose affirm. Caput postice latum, fronte production et scepe an- 

 gustum. Antennas lmce crassce et basi contiguw. 



Near Cymothoa in most characters. Head broad at base, but with the 

 front produced and often narrow. Superior antennas stout and 

 exposed nearly from base, in contact at base. 



The caudal stylets are often partly concealed under the sides of the 

 abdomen. This genus is in part Cymothoa of authors. 



Ceratothoa linearis. 



Corpus elongate lineare. Caput transversum, fronte saliens, processubus 

 anticis segmenti sequentis perbrevibus. Segmenta thoracis 4 antica 

 paulo breviora quam lata. Antennas ante frontem salientes, compresm, 

 valida3, lnim b-articulatw, 2dm 7-articulatce parce longiores. Seg- 

 raentum abdominis ultimum paulo transversum, thorace non angustius, 

 postice profunde emarginatum, angulis posticis late rotundatis. 



Body long linear. Head transverse, front prominently projecting; 

 processes of next joint either side of head very short. Four an- 

 terior segments of thorax much longer than half their breadth. 

 Antennae prominent, compressed, very stout ; first pair five-jointed, 

 second pair seven-jointed, a little the longer. Posterior abdominal 

 segment somewhat transverse, not narrower than thorax, posterior 

 angles very broadly rounded, and margin behind deeply emargi- 

 nate. 



Plate 50, fig. 1 a, dorsal view, somewhat enlarged; b, ventral view; 

 c, under view of head ; d, mandible. 



From a fish in the Gulf Stream. 



