ISOPODS OF NORTH AMERICA. 491 



ANALYTICAL KEY TO THE SPECIES OF THE GENTS EritYCOPK. 



n. Front of head produced to an acute rostriform projection. Base of head without 

 short transverse ridge. First, second, third, and fourth segments smooth, and 

 produced on each side to acute, anteriorly pointed lappets. Three posterior seg- 

 ments smooth, with antero-lateral angles acutely produced. Caudal segment 

 large, semioval in form, edges evenly curved, and perfectly smooth. 



Eurycope cornuta G. O. Sars 



a'. Front of head has appearance of rostral point caused by frontal margin extending 

 l>etween antennulae. Base of head with short transverse, tubercular ridge; two 

 oblong, low tubercles situated behind peduncles of antennulae. First segment of 

 thorax with transverse groove. Second, third, and fourth segments have deep 

 transverse depressions, with a sharp spine on anterior portion of each segment, 

 and a compressed protuberance on the posterior portion. Antero-lateral angles of 

 each of these segments produced in short, sharp spines. Epimera of first segment 

 has a single spine, of three following segments two spines each. Three posterior 

 segments of thorax have each two spines, one on either side of median line. Spine 

 present at base of abdomen. At extremity of terminal segment is a spine, on 

 either side of which is a lateral triangular spine Eurycope cariblea Benedict 



EURYCOPE CORNUTA G. O. Sars. 



Eurycope cornuta G. O. SARS, Chr. Vid. Selsk. Forhandl., 1863, p. 5, 1864. 



Eurycope robusta HARGER, Am. Jour. Sci. (3), XV, 1878, p. 375; Proc. U. S. 

 Nat. Mus., II, 1879, p. 159; Report U. S. Commissioner of Fish and Fisher- 

 ies, 1880, Pt. 6, pp. 332-334, pi. in, fig. 15. HANSEN, Videnskabelige Meddel- 

 elser fra den Naturhistoriske Forening i Kj0benhavn, 1887-88, pp. 195-196. 



Eurycope cornuta SARS, Crust. Norway, II, 1899, p. 145, pi. LXIV. RICHARDSOX, 

 American Naturalist, XXXIV, 1900, p. 301; Proc. U. S. Nat. Mus., XXIII, 

 1901, p. 558. 



Localities. Gulf of St. Lawrence; Atlantic coast of North America; 

 also coast of Norway; Skagerak; Uinanakfjord, Greenland; Kara Sea; 

 latitude 71 10' north, longitude 58 56' west. 



Depth. 50 to 400 fathoms. 



"Body oblong oval in outline, being more than twice as long as it is 

 broad, and with the anterior division not attaining half the length of 

 the posterior. Cephalon with the lateral corners pointed, front pro- 

 duced to an acute, rostriform projection, which, however, does not 

 extend to the end of the basal joint of the superior antenna?. The four 

 anterior segments of mesosome comparatively short, and produced on 

 each side to acute, anteriorly pointed lappets. The three posterior 

 segments of mesosome of nearly equal size, and distinctly defined, 

 antero-lateral corners acutely produced. Caudal segment very large, 

 nearly as long as the two preceding segments combined, semi-oval in 

 form, edges evenly curved and perfectly smooth, antero-lateral corners 

 projecting. Superior antennae in male fully half the length of the 

 body, in female somewhat shorter, flagellum very slender and flexible, 

 being composed of twenty in female, in male of about fifty articulations, 

 carrying delicate sensory filaments. Inferior antennae more than three 



