ISOPODS OF NORTH AMERICA. 19 



"The second or first free thoracic segment is about two-thirds as 

 long as the third; this in turn is about equal to the fourth and to the 

 fifth segments, while the sixth and seventh segments are progressively 

 somewhat shorter. The second pair of legs are scarcely more slender 

 than, the following pairs, and the basal segments are not curved around 

 the base of the first pair. 



' ' The uropods are short and biramous ; each ramus two-jointed. The 

 outer ramus is more slender than the inner, half its length, and bears 

 a long bristle at the tip. 



"Length, 2.5 mm.; color, white." HARGER." 



LEPTOGNATHIA LONGIREMIS (Lilljeborg). 



Tanais longiremis LILLJEBORG, Upsala Univ. Arsskr., Math, og Naturv., I, 1865, 

 p. 23-25. 



Tanais islandicus G. O. SARS, Archiv for Math, og Naturv., Christiania, II, 1877. 

 p. 346. 



Leplognathia longiremis G. O. SARS, Archiv for Math, og Naturv., 1882, p. 41; 

 Norwegian North Atlantic Expedition, 1876-1878, Crustacea, I, 1885, pp. 

 79-82, pi. vii, figs. 17-28; II, 1886, p. 26. HANSEN, Dijmphna-Togtete 

 zoologisk-botanske Udbytte, 1887, p. 185; Vidensk. Meddel. fra den 

 Naturh. Foren. i Kj0bh., 1887-88, p. 179, pi. vi, figs. 9-9b. (See Hansen 

 for synonymy.) SCOTT, Ann. Scottish Nat. Hist., 1898, p. 220. SARS, Crust. 

 Norway, II, 1899, p. 27, pi. xn. RICHARDSON, American Naturalist, 

 XXXIV, 1900, p. 211; Proc. U. S. Nat. Mus., XXIII, 1901, p. 502. AXEL 

 OHLIN,& Bihang till K. Sv. Vet.-Akad. Handl., XXVI, Afd. iv, No. 12, 1901, 

 pp. 15-16. 



Localities. Kekertak, Greenland; Scotland; Norway; Iceland; Den- 

 mark; latitude 77 9' north, longitude 14 40' east, off Ice Islands; 

 latitude 74 35' north, longitude 18 23' west, off Little Pendulum 

 Island. 



Depth. 7-200 fathoms; also shallow water. 



Found in soft gray clay, in sandy mud and algae. 



"Body of female rather slender and elongated, more than seven 

 times as long as it is broad; cephalosome about the length of the first 

 two segments of mesosome combined, with the proximal half of uni- 

 form breadth, the distal one abruptly attenuated; first free segment of 

 mesosome about same size as the last one, bothjjeing shorter than the 

 others; metasome well developed, exceeding in length the last two 

 segments of mesosome combined, terminal segment nearly occupying 



Report U. S. Commissioner of Fish and Fisheries, 1880, Pt. 6, pp. 427-428. 



& Hansen in Ohlin (Bihang till K. Sv. Vet.-Akad. Handl., XXVI, Afd. iv, No. 

 12, 1901, pp. 16-17, footnote) considers Leptognathia longiremis Sare as distinct from 

 Leptognathia longiremis (Lilljeborg). He proposes to call it Leptognathia sarsi and 

 considers that it differs in having the last segment of the abdomen armed on each 

 side with a small denticle, in having the basal part of the uropoda rather short, the 

 inner branch long, composed of two articles, the other branch short, composed of 

 two joints, the hand of the chelipeds dentated on the inferior margin. 



