ISOPODS OF NORTH AMERICA. 



395 



long as first; third twice as long as second ; fourth a little longer than third ; 

 the fifth is half the length of the fourth. Two longitudinal lateral rows of 

 low tubercles extend the entire length of the thorax, one row on either 



side along the lateral portions of the segments Edotea triloba ( Say ) 



b f . Lateral margins of thorax rounded. Lateral incisions at base of terminal 

 segment of body deep. Second pair of antennre do not quite extend to 

 the end of the third article of the first pair of antennae; first, second, and 

 third articles subequal; fourth article a little longer than third ; fifth arti- 

 cle half the length of the fourth. There are no tubercles on the lateral 

 portions of the segments of the thorax Edotea montosa (Stimpson) 



EDOTEA ACUTA Richardson. 



Edotea acuta RICHARDSON, American Naturalist, XXXIV, 1900, p. 228; Proc. 

 U. S. Nat. Mus., XXIII, 1901, pp. 544-546. 



Depth. 105 fathoms. 



Head with the antero-lateral angles produced in knob-like projections. 

 Four tubercles situated on the surface of the head, two on the anterior 

 part and two on the posterior part. First pair 

 of antennae twice as long as the lateral projec- 

 tions. Second pair not reaching beyond the 



FIG. 439. EDOTEA ACUTA. 



FIG. 440. EDOTEA ACUTA. o, MAXILLIPED. 

 x 51f. 6, SECOND ANTENNA, x 51|. c, 



FIRST ANTENNA. X 51|. 



lateral projections, and carrying a rudimentary flagellum composed 

 of one article. 



Thoracic segments subequal. Sides of all the segments produced 

 into knob-like projections. 



Terminal abdominal segment with a transverse depression or groove 

 on either side of which the lateral margin is indented. Apex of seg- 

 ment produced as in Edotea montosa. 



Color white. 



Three specimens were found in the stomach of a cod, taken by the 

 U. S. Bureau of Fisheries steamer Albatross while cruising in the 

 Atlantic Ocean from Woods Hole, Massachusetts, to Nova Scotia. 



Depth. 105 fathoms. 



Type. QuA,. No. 23909, U.S.N.M. 



