ISOPODS OF NORTH AMERICA. 



Leg's of the first three pairs prehensile; those of the last four pairs 

 ambulatory. There are three spines on the propodus and three on 

 the nierus of all three anterior pairs. 



ROCINELA PROPODIALIS Richardson. 



Rocinela propoduilis RICHARDSON, Bull. r. S. Fish Comm., XXIV 1905 pp 

 214-215. 



Locality. Admiralty Inlet, vicinity of Port Townsend. 



Depth. 15-20 fathoms. 



Body nearly twice as long as wide. Color brown, with small black 

 dots. 



Head triangular and produced in front in a broad median process. 

 Eyes large and separated in front by a distance equal to the length of 

 one eye. The first pair of antennae extend to the posterior margin of 

 the head or to the end of the peduncle of the second pair; the flagel- 



FIG. 1%. ROCINELA PRO- 

 PODIALIS. HEAD WITH 

 ANTENNAE AND FIRST 



TWO THORACIC SEG- FlG. 197. ROCINELA PROPODIA- FlG. 198. ROCINELA PROPODIALIS. 

 MENTS. x 2. LIS. ABDOMEN, x 2j. THIRD LEG. x 7. 



luin has four to six joints. The second pair of antennae reach the 

 posterior margin of the second thoracic segment; the flagellum has 

 sixteen joints. 



The several segments of the thorax are about equal in length, the 

 first segment being a little longer and the last a little shorter than the 

 others. The epimera of all the segments are produced at the outer 

 posterior angle, becoming more and more pointed in the last four seg- 

 ments. The epimera of the last segment only project beyond the 

 posterior margin of the segment. 



The first segment of the abdomen is entirely concealed by the last 

 thoracic segment. The fifth is narrower than the preceding ones, 

 but longer in the median line. The terminal abdominal segment 

 is linguiform, rounded posteriorly, with smooth margins furnished 

 with short hairs. The uropoda do not exceed in length the terminal 

 abdominal segment. The outer branch is somewhat narrower and 

 shorter than the inner, and both branches are armed with a few 

 short spines along the outer margins and with long hairs along the 

 inner margins. 



