278 



Icii'm. Posterior gnathopoda somewliat stronger, and distinctly subclieliform, 

 propodos considerably dilated distally, with the palm well defined and armed 

 with a double row of strong spines. Pereiopoda slender and elongated, basal 

 joint of all the 3 posterior pairs laminarly expanded. The 3 anterior pairs 

 of nro]>oda biramous, with the rami unequal in length and armed near the 

 tip with 2 juxtaposed spinules; last pair uniramous. Telson not defined 

 from the last segment of urosome, and terminating in a sharp point, to each 

 side of wliich there is a short dentiform projection. 



Remarks. — This genus is chiefly distinguished from the other genera 

 belonging to the family Stenothoidse by the large size of the mandibular palp, 

 by the deviating form of the 4th pair of coxal plates, and by the basal joint 

 of all the 3 posterior pairs of pereiopoda being laminai'ly expanded, finally' 

 by the telson not being defined from the last segment of urosome. The generic 

 name Danaia, proposed by Sp. Bate, having been already appropriated in Zoo- 

 logy, that of Boech must be retained for the genus It comprises as yet but 3 

 species, 2 of which will be described in the sequel, the 3rd being the C. ahyH- 

 sicola described by the author from the Norwegian North Atlantic Expedition. 



30. Cressa dubia (Sp. Bate). 



(PI. 98, lig, 2, PL 99, fig. 1). 

 Danaia dubia, Sp Bate, Catal. Ainph. Brit. Mus. p. 59, PI. X, lig. T. 

 Syn. Cressa Scliodfei, Boecli. 



Body rather high and compressed, with the last 2 segments of meso- 

 some and these of metasome each produced at the end dorsally to a recurved 

 dentiform projection. Cephalon about twice the length of the 1st segment 

 of raesosome, and somewhat produced in front between the bases of the supe- 

 rior antennae, lateral corners jutting out as an amminate lobe having inferi- 

 orly a pointed, anteriorly-curving, dentiform projection. Second and 3rd pairs 

 of coxal plates having each at the infero-posteal corner 4 to 5 anteriorly 

 curving coarse serrations; 4th pair nearly twice as deep as the corresponding 

 segment, distal edge transversely truncated, posterior emargination defined 

 below by a sharp corner. Last pair of epimeral plates of metasome consi- 

 dej'ably produced at the lateral corners. Eyes rather large, oval in form, 

 pigment dark red. Superior antennte in female about the length of the 

 cephalon and mesosome combined, 1st joint of the peduncle rather elongated, 

 somewhat exceeding in length the 2nd, both produced at the end posteriorly 

 to a triangular scale like projection, flagellura extremely slender, more than 

 twice as long as the peduncle, and composed of about 20 articulations. Same 



