ISOPODS OF NORTH AMERICA. 19 



"The second or lirst free thoracic segment is about two-tliirds as 

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

 lifth 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 lirst 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 LiLL.iEHoK(i, lf[)«ila Univ. Arsskr., Math, og Naturv., I, 1865, 

 p. 23-25. 



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

 p. 346. 

 • Leptognalhia longiremis G. O. S.\rs, 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-Togtets 

 zoologisli-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^ynon ymy. ) — Scott, Ann. Scottish Nat. Hist., 1898, p. 220. — Sars, Crust. 

 Norway, II, 1899, p. 27, \)\. xii. — Richakdson, American Naturalist, 

 XXXlV, 1900, p. 211; Proc. U. S. Nat. Mus., XXIII, 1901, p. 502.— Axel 

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

 pp. 15-16. 



Zww//?'/e.s-.— Kekertak, (xreonland; Scotland; Norway; Iceland; Den- 

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

 latitude 74-" 35' north, h)ngitude 18° 23' west, off Little Pendulum 

 Island. 



Depth. — 7-200 fathoms; also sliallow water. 



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



"Body of female rather slendei- 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 hist one, both being shoi'tcr than tiie 

 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 LeptognatJda longiremis Sars as distinct from 

 lA'ptognathia longiremis (Lilljeborg). He proposes to call it Leplognathia sarsl 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. 



