ME. E. J. MIEES ON THE IDOTEID^E. 13 



Squilla entoraon, De Geer, Mem. pour servir a I' Hist, des Insectes, vii. 

 p. 514, pi. xxxii. figs. 1-10 (1778). 



Asellus entomon, Olivier, Eneycl. Meth. p. 253 (1789). 



? Cymothoa entoraon, Fahr. Ent. Syst. ii. p. 505 (1793). 



? Asellus entomon, Olivier, Eneycl. Meth. iv. p. 253 (1789). 



Idotea entomon, Bosc, Hist. Nat. des Crust, ii. p. 178 (1802); 1 Latr. 

 Hist. Nat. Crust, et Ins. vi. p. 361, vii. pi. Iviii. figs. 2, 3 (1803-4) ; 

 ? Lamarck, Hist, des Anim. sans Vert. (ed. i.) v. p. 159 (1818) ; ? Sa- 

 bine, Appendix in Parry's Arctic Voy. p. ccxxviii (1821); 1 Ross, 

 Zool. in Parry's '3rd Voy. p. 117 (1826) ; ? Desm. Consid. Cr. p. 289 

 (1825); 1 Eichioald, " Geogn. zool, per Ingriam marisque Baltici 

 provincias obs. pi. v. fig. 1"; Rathke, "Neuste Schriften der naturf. 

 Gesellsch. in Danzig, i. p. 109, pi. iv. (1820) " ; Krbyer, Vid. Selsk. 

 Skrift. vii. p. 323 (1838) ; M.-Edwards, Hist. Nat. Crust, iii. p. 128 

 (1840)?; Kroyer,Nat. Tidsskr. ii. p. 402(1847); White, List Cr. 

 Brit.Mus.^p. 93 (1847); Brandt, Cr.inMiddeiidorff's Sibirische Reise, 

 ii. p. 145 (1851 ) ; Loven, (Efvers. Vetensk.-Akad. Forhandl. Stockholm, 

 xviii. p. 286 (1852) ; Bell, in Belcher's Last of the Arctic Voyages, i. 

 p. 408 (1855)?; Lindstrom, (Efv. Vet.-Akad. Forhandl. p. 66 (1856) ; 

 Haughton, Proc. Nat. Hist. Soc. Dublin, iv. p. 61 (1865) ; Mobius, 

 Ann. Sf Mag. Nat. Hist. ser. 4, xii. p. 84 (1873) ; Cajander, Cr. in 

 Notiser Fauna S; Flora Fennica, p. 374 (1869) ; Meinert, Nat. Tidsskr. 

 (3 R.) xi. p. 84 (1877); Brandt, Comptes Rendus, p. 713(1880); id. 

 Attn. Sf Mag. Nat. Hist. vi. p. 98 (1880). 



? Saduria entomon, Adams, in White, Sutherland's Voy. Baffin's Bay, 8)C. 

 Appendix, p. ccvii (1852). 



Idotsega longicauda, Lockington, Pr. Cal. Acad, Sci, vii. (pt. i.) p. 45 



(1877). 



In the specimens I refer to this species the body is ovate, 

 moderately convex, Avith a more or less faintly- indicated median 

 carina, and posteriorly much elongated. Head anteriorly deeply 

 excavated, its anterior margin with a median sinus, its antero- 

 lateral lobes rounded or subtruncated, its anterior margin slightly 

 thickened on each side of the median sinus. The three anterior 

 segments have each a slight elevation in the middle line, and 

 another on each side, but at some distance from the lateral 

 margins (these are most distinct in the younger individuals) ; 

 the first segment is widest at the lateral margins. The post- 

 abdomen is longer than the thorax, with the first four segments 

 distinct but very short ; terminal segment smooth, with the sides 

 convergent to the distal extremity, whicli usually curves uj)ward 

 and is blunt or subacute ; the median longitudinal dorsal carina is 

 more distinctly indicated on this segment than on the rest of the 



