ISOPODS OF NOKTH AMERICA. 35 



ence mainly concerns the terminal joint of the limb, which is consid- 

 erably more elongated than in the anterior appendages; it terminates 

 in a fringe of short spines and mesially in a long slender spine which 

 is of about half the length of the joint. 



"On the abdomen all the appendages are present, but they present 

 no special features of interest, with the exception of the uropoda, 

 which have a typical structure. 



. "The basal joint of the uropoda is very stout and long, and with it 

 articulates the minute two- jointed exopodite, as well as the long slender 

 endopodite, which is made up of eight separate joints, all of which have 

 tufts of hairs near to their articulation with the succeeding joints. 

 Both the endopodite and the exopodite end in a tuft of slender hairs; 

 the length of the uropoda is nearly equal to that of the abdomen. 



" Another example of this species was dredged in the North Atlan- 

 tic from a depth of 1,250 fathoms; it presents certain slight differences 

 from the above-described species; these differences have reference to 

 the proportionate length of the thoracic segments. Seeing, however, 

 that the two specimens come from widely distant localities, it appears 

 to be unnecessary to found a specific distinction between the two indi- 

 viduals, at least for the present. The present specimen is stouter and 

 more robust than the last, but of equal length; the cephalothorax is 

 nearly as long as the first three segments of the thorax taken together; 

 the thoracic segments gradually increase in length up to the fourth; 

 the fifth and sixth segments are subequal and about as long as the 

 third. " BEDDAKD. a 



NEOTANAIS HASTIGER (Norman and Stebbing).& 



Alaotanais hastiger NORMAN and STEBBING, Trans. Zool. Soc. Lond., XII, 1886, 

 Pt. 4, pp. 113, 114, pi. xxin, fig. 2. HANSEN, Videnskabelige Meddel- 

 elser fra den naturhistoriske Forening i Kj0benhavn, 1887-1888, p. 178. 

 RICHARDSON, American Naturalist, .XXXIV, 1900, p. 212; Proc. U. S. Nat. 

 Mus., XXIII, 1901, p. 502. 



Locality. Latitude 59 11' north, longitude 50 25' west. 



Depth. 1,750 fathoms. 



"This species comes very near to the last (N. serratispinosus). It 

 differs from it in having the eye processes relatively larger, and in the 

 massiveness of the hand and finger of the first gnathopods; in these 

 organs all the parts are thickened and straightened without any pro- 

 portionate increase in length. The effect of this is to make the inner 

 edge of the thumb and finger overlap when closed all along the line, 

 except for a small triangular space near the root of the thumb. The 

 uropods have the inner branch nine, the outer two-jointed. 



Challenger Report, XVII, 1886, pp. 124-125. 



& Stebbing says that without doubt Alaotanais is a synonym of Neotanais 

 Crust., 1893, p. 324. 



LIBRA R 



