NE W ISO POD CR IJSTA CEA NS— RICHARDSON. 



The first segment of the abdomen has three suture lines, and its 

 posterior margin is produced in two small points, one on either side of 

 the median line, about equidistant from it and the lateral margin of 

 the segment. The terminal segment is widely rounded posteriorly. 

 The inner branch of the uropoda is of nearly equal width throughout 

 its length and is rounded at its extremity; the outer branch is slender 

 and sharply pointed. Both branches are of nearlj^ equal length, and 

 neither extend beyond the tip of the abdomen. This is true of both 

 sexes. 



The first pair of legs have the propodus dilated and the dactylus 

 reflexible. The propodus is large and oval in shape. In the legs 

 of the second pair the propodus is irregular in shape, dilated with 

 reflexible dactylus in the male and simple in the 

 female. The legs of the other five pairs are sinii 

 lar in structure, am})ulatorv, and show^ a gradual 

 increase in length. 



This species difi'ers from 2\ alascensis in having 

 longer antenna? and antennulaj; in having a rounded 

 terminal segment, which in that species is very 

 pointed but more acute in the male than in the 

 female; in having the outer branch of the uropods 

 in both sexes as short as the inner, while in that 

 species it is much longer in the male but not in 

 the female; in having only a gradual increase in 

 the length of the legs, which in that species show 

 such marked disproportions in the propodus of the 

 sixth and seventh pairs; and in the position of the 

 eyes, which in this species are situated in the me- 

 dian transverse line of the head, whih in T. alascen- 

 sis they are placed in the posterior half of the head. 



This species was considered by Hansen, who had not examined any 

 specimens, to be a synonym of T. alascensts." Having sent specimens, 

 a male and female of both species, to Doctor Hansen, 1 received a 

 courteous and speedy recognition of his error. Doctor Hansen states 

 in his letter that ''both species are well founded," and that "7! con- 

 vexus is a fine species; especially the difi'erences in the shape of the 

 first and second hand and seventh thoracic leg in the males of both 

 species are realh" interesting." 



Genus CYMODOCE Leach. 



Seventh segment of thorax not produced backwai-d in any process. 



Abdomen composed of two segments, the first of which is Avithout 



mesial process. Terminal abdominal segment in both sexes with a 



« Quarterly Journal of Microscopical Science, XLIX, Pt. 1, October, 1905, pp. 

 133-134. 



Fig. 9. — Tecticeps con- 

 VEXUS. Second leg op 



MALE. X 4|. 



