278 



form. Posterior gnathopoda somewhat stronger, and distinctly subcheliform, 

 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 uropoda 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 which there is a short dentiform projection. 



//' murks. - - This genus is chiefly distinguished from the other genera 

 belonging to the family Stenothoidae 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 laminarly expanded, finally 

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

 name Ikn/n/u, proposed by Sp. Bate, having been already appropriated in Zoo- 

 logy, that of Boeck 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. ctl >!/-- 

 described by the author from the Norwegian North Atlantic Expedition. 



30. Cressa dubia (Sp. Bate). 



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

 Danaia dulia, Sp Bate, Catal. Amph. Brit. Mus. p. 59, PI. X, fig. 1. 



Syu. Cressa Schodtei, Boeck. 



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

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

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

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

 rior antennse, 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- 

 derably produced at the lateral corners. Eyes rather large, oval in form, 

 pigment dark red. Superior antennse 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, flagellum extremely slender, more than 

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



