ISOPODS OK NORTH AMERICA. 



69 



ANTHELURA ABYSSORUM Norman and Stebbing. 



^n</(e/Mra «6//.ssorum NoKMAN and STEBBiN(i, Trans. Zool. Soc. Lond., XII, 1886, 

 Pt. 4, pp. 127-128, pi. XXVII, fig. 2. — Hansen, Videnskabelige Meddelelser 

 fra den Natarhistoriske Forening i Kj0benhavn, 1887-1888, p. 181. — Rich- 

 ardson, American Naturalist, XXXIV, 1900, p. 215; Proc. U. S. Nat. Mas., 

 XXIII, liH)l, p. 508. 



Localities. — Near entrance of 

 Davis Straits; latitude 59 ' 10' 

 north, long-itude 50^ 25' west. 



Depth. — 1,750 fathoms. 



"Head and per.eon of nearly 

 equal width throughout; second 

 segment of the latter scarcely 

 at all constricted behind. The 

 whole of the segments smooth 

 above, and devoid oi' all furrow- 

 ing and pitting; last segment of 

 perwon half as long as the pre- 

 ceding segments of pleon, very 

 clearly defined, and (exclusive of 

 telson) sube([ual in length to 

 penidtimate s(>gment of penvon. 



""The antennie have the joints 

 of the peduncle in both pairs flat- 

 tened, the lower pair touching 

 each other with the compressed 

 inner margins, and appeai'ing 

 between the upper pair, as in 

 Anthelnra eJoiujata; flagella of 

 both pairs many jointed. 



"First gnathopods having ba- 

 sos short and very thick; ischium 

 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 set». 



"Second gnatliopods having 

 basos and ischium more slender 

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

 spine-like setic and one spine; hand elongate-ovate, i)alni with three 

 spines and a few seta3. 



Fig. 54.— Anthelcra abys.sorum (After Norman 

 ANP Stebbing). «, Lateral view. 6, Head 



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

 ANTENNA. C, FlKST GNATHOPOD. /", SECOND 

 GNATHOPOD. IJ, FIFTH PER.EOPOD. h, .\BDOMEN 

 (FROM ABOVE), i, .\BDOMEN (FROM THE SIDE). 



