ISOPODS OF NORTH AMERICA. 



201 



are round; those of the last three are acute. A faint carina crosses 

 the epimera obliquely. 



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

 thoracic segment, so that there is no trace of it whatever on the dorsal 

 side. The lateral parts of the segments are not distinct from the 

 dorsal portion. The last segment is widely rounded posteriorly with 

 margin faintly crenulate. The uropoda are alike in shape, being long 

 and narrow with posterior margins rounded, oar-like; the inner branch 

 is a little longer than the outer branch and does not extend be} r ond 

 the extremity of the terminal abdominal segment; the branches are 

 equally wide. The basal segment of the uropoda extends as far as the 

 end of the outer branch, and nearly to the end of the inner branch. 



The first three pairs of legs are prehensile; the last four pairs ambula- 

 tory. There are three spines on the merus and three on the propodus 

 of the first three pairs of legs. 



The lateral parts of the second, third, fourth, and fifth segments of 

 the abdomen and the base of the sixth or terminal segment are marked 

 with black. 



ROCINELA AMERICANA Schicedte and Meinert. 



Rodnela americana SCHICEDTE and MEINERT, Naturhistorisk Tidsskrift (3), XII, 

 1879-1880, pp. 394-395, pi. xn, figs. 16-18. HARGER, Bull. Museum Comp. 

 Zool., Harvard College, XI, 1883, No. 4, pp. 98-99, pi. iv, figs. 3, 3a, 4; 

 pi. iv, figs. 2-2a. RICHARDSON, American Naturalist, XXXIV, 1900, p. 219; 

 Proc. U. S. Nat. Mus., XXIII, 1901, p. 524. 



Localities. Trenton, Maine; latitude 40 

 2' 54" north, longitude 70 23' 40" west; lati- 

 tude 409 north, 

 longitude 70 57' 

 west; latitude 

 39 57' north, 

 longitude 70 57' 

 30" west; lati- 

 tude 37 25' 

 north, longitude 

 74 18' west; ' 

 latitude 40 2' 



FIG. 193. ROCINELA AMERICANA north, longi- 



FIG. 194. ROCINELA AMERICANA, a, 

 SECOND LEG. x 11J. b, MAXILLIPED. 

 x 39. 



(AFTER SCHICEDTE AND MEIN- frnde 70 37' 30" 

 ERT). a, FRONTAL MARGIN WITH 



BOTH ANTENNA AND FRONTAL WCSt. 



LAMINA, b, YOUNG FEMALE. /- ^2 O t 



(ENLARGED.) Depth. 85 - 



157 fathoms. 



Body ovate, a little more than twice as long as broad, 9 mm. : 20 mm. 



Head twice as wide as long, 2 mm. : 4 mm.; triangular in shape, 



with the front produced over the basal articles of the antennae Eyes 



