ISOPODS OF NORTH AMERICA. 



69 



ANTHELURA ABYSSORUM Norman and Stebbing. 



AnLhelura abyssorum NORMAN and STEBBING, Trans. Zool. Soc. Lond., XII, 1886, 

 Pt. 4, pp. 127-128, pi. xxvn, fig. 2. HANSEN, Videnskabelige Meddelelser 

 fra den Naturhistoriske Forening i Kj0benhavn, 1887-1888, p. 181. RICH- 

 ARDSON, American Naturalist, XXXIV, 1900, p. 215; Proc. U. S. Nat. Mus., 

 XXIII, 1901, p. 508. 



Localities. Near entrance of 

 Davis Straits; latitude 59 10' 

 north, longitude 50 25' west. 



Depth. 1,750 fathoms. 



"Head and peraeon of nearly 

 equal width throughout; second 

 segment of the latter scarcely 

 at all constricted behind. The 

 whole of the segments smooth 

 above, and devoid of all furrow- 

 ing and pitting; last segment of 

 peraeon half as long as the pre- 

 ceding segments of pleon, very 

 clearly defined, and (exclusive of 

 telson) subequal in length to 

 penultimate segment of peneon. 



"The antennae have the joints 

 of the peduncle in both pairs flat- 

 tened, the lower pair touching 

 each other with the compressed 

 inner margins, and appearing 

 between the upper pair, as in 

 Anthelura elongata; flagella of 

 both pairs many jointed. 



"First gnathopods having ba- 

 sos short and very thick; ischiuni 

 scarcely longer, and not so broad; 

 cup of meros well rounded; car- 

 pus small as usual, bearing five 

 or six spine-like setae; hand about 

 twice as long as greatest breadth; 

 palm concave, bearing about eight 

 slender spine-like setae. 



"Second gnathopods having 

 basos and ischium more slender 

 than in first pair; meros of similar form; carpus edged with several 

 spine-like setaa and one spine; hand elongate-ovate, palm with three 

 spines and a few setae. 



FIG. 54. ANTHELURA ABYSSORUM (AFTER NORMAN 

 AND STEBBING). a, LATERAL VIEW. 6, HEAD 



(FROM ABOVE). C, UPPER ANTENNA, d, LOWER 



ANTENNA, e, FIRST GNATHOPOD. f, SECOND 



GNATHOPOD. g, FIFTH PERjEOPOD. A, ABDOMEN 

 (FROM ABOVE). t' v ABDOMEN (FROM THE SIDE). 



