502 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



2. CRYPTOCOPE Sars. 



3. CRYPTOCOPE ARCTICA Hansen. 



Cryptocope arctica Hansen, Vidensk. Meddel. fra den Naturh. Foren. i Kjobh., 

 1887, p. 180, pi. VII, fig. 1-lc. 



Hcibitat. — Greenland; Kara Sea. 



S. LEPTOGNATHIA G. O. Sars. 



ANALYTICAL KEY TO THE SPECIES OF LEPTOGNATHIA. 



a. In female inner branch of uropoda twice as long as outer. The second or first 

 free segment of thorax about two-thirds as long as the third, which in turn is 

 about equal to the fourth and fifth. Sixth and seventh segments progress- 

 ively somewhat shorter. Propodus of first pair of legs less robust than 

 carpus 4. Leptognathia caeca (Harger) . 



a'. In female inner branch of uropoda more than three times as long as outer. The 

 second or first free segment of thorax about same size as the last one, both 

 being shorter than the others. Propodus of the first pair of legs scarcely 

 smaller than carpus 5. Leptognathia longiremls (Lilljeborg) . 



4. LEPTOGNATHIA CCECA (Harger). 



Paratanais ca-ca Harger, Am. Jour. Sci., XV, 1878, p. 378. 



LeptocheUa cwca Harger, Proc. U. S. Nat. Mus., II, 1879, p. 164; Keport U. S. 



Commissioner of Fish and Fisheries, 1880, Pt. 6, pp. 427, 428, pi. xiii, fig. 91. 

 Leptognathia cceca Norman and Steering, Trans. Zool. Soc. Lond., XII, 1886, 



Pt. 4, p. 110. 



Ilahltat. — Massachusetts Bay, off Salem, Provincetown, Massa- 

 chusetts. 



De^th. — Surface to 48 fathoms. 



5. LEPTOGNATHIA LONGIREMIS (Lilljeborg). 



Tanais longiremis Lilljeborg, Bidrag till Kilnnedomen om de inom Sverige och 

 Norrige forekommende Crustaceen af Isopodernas Underordning och Tana- 

 idernas Familj, Upsala Univ. Arsskr., Math, og Naturv., I, 1865, p. 23. 



Tanais idandicus G. O. Sars, Archiv for Math, og Naturvid., Christiania, 1876, 

 p. 346. 



Leptognathia longiremis G. 0. Sars, Archiv for Math, og Natur\'id., 1880, p. 41; 

 Norwegian North Atlantic Expedition, 1876-1878, Crustacea, I, 1885; II, 

 1886, p. 79, pi. vii, figs. 17-28; Account of Crust, of Norway, II, 1896-1899, 

 p. 27, pi. XII. — Hansen, Dijmphna-Togtots zoologisk-botanske Udbytte, 

 1886, p. 185; Vidensk. IVIeddel. fra den Naturh. Foren. i Kjobh., 1887, p. 179, 

 pi. VI, figs. 9-9b. (See Hansen for synonymy.) 



Ilcihitat. — Greenland (Hansen); also Scotland (Scott); Norway; Ice- 

 land; Denmark. 



Depth. — 35 to -40 fathoms. 



4. ALAOTANAIS Norman and Stebbing. 



6. ALAOTANAIS HASTIGER Norman and Stebbing. 



Alaotana'is hastlger Norman and Stebbing, Trans. Zool. Soc. Lond., XII, 1886, 

 Pt. 4, pp. 113, 114, pi. xxiii, fig. 2. 



Hahitat.—ljVit. 59° 11' N., long. 50° 25' W. 

 Depth. — 1,750 fathoms. 



