o4> BULLETIN :4. UNITED STATE? NATIONAL MUSEUM. 



MESIDOTEA ENTOMON Linnaeus .fl 



Oni^u^ tttiomoii Lixs^r?;, Syst. Nat-, 12th ei^i., I. Pt, 2, 1767, p. 1060.— Pallas, 



SpiciL ZooL, IX. 1772, p. 64, pi. v, figs. 1-6. 

 SquWa eiiiomori De Gker, Mem. pour servir a THist. des Insectee, ATI, 177S, p. 



514, pL XXXII, figs. 1-10. 

 Aseilus enioriion Olivier, EncycL Meth., lY, 1789, p. 253. 

 (?) C\/au4ftoa eniomon Fabeictts, Ent. Svst,, II, 179S, p. 505. 

 IdoUa eniomon Bosc, Hist. Nat. des Cmst., 11, 1S02, p. 178. — ^IIatbeille, Hist. 



Nat- Crust, et Ins.. YI, 1S03-4, p. 361; YII, pi. Lviii. figs. 2-3. — (?) Lamarck, 



Hist- des Anini. sans Yert-. 1st ed..Y. 181S. p. 1.59. — Rathke, Nenste Schriften 



der natnrf. G^sellsch. in Danzig, I, 1820, p. 109, pL iv. — (?) Desmaeest. 



Consid. Crust., 1S25, p. 289.— Ke0Tee, Yid. Selsk. Skrift., "\1I, 1838, p. 



323.— MiLXE Edwards, Hist. Nat. Crust-. Ill, 1840, p. 128. — Ke0yer, Nat. 



Tidsskr.. II, 1846-49, p. 402.— White. List Cr. Brit. Mus., 1847, p. 93.— 



Beaxdt, Crust, in Middendorf s Sibirisc-he Reise, II, 1851, p. 145. 

 (?) Saduria etUornon Adams iu White, Sutherland's A'oy. Baflin's Bay. Appendix. 



1852. p. 207. 

 Id ' LocKXSGTox. Proc. Cal. Acad. Sci., YII, 1877, Pt. 1, p. 45. 



I-' -Ieixeet. Nat. Tidsskr. (3). XI. 1877, p. 84. — Braxdt, Comptes 



Rendus, 1?^\ p. 713: Ann. Mag. Nat. Hist.. YI, 1880, p. 98. 

 Glifpiom^xu* eniomon Mlebs, Trans. Linn. Soc. London, XYI, 1883, pp. 12-13, pi. 



I, figs. 1-2. (See Miers for further synonymy.) — Richardson. Proc. U. S. 



Nat^ Mus-. XXI, 1899, p, 843: Ann. Mag. Nat- Hist, (7), lY. 1899, p. 262. 



IxKuJ it <<:--:. — Circiuupolar: west coast of ^Sorth America to Pacitie 

 Grove. California; Stockholm's skargard (J. Lindahl); KielerbucJit. 

 Germany: Nakvak. Labrador: Kara Sea. 



Foimd on beach: 5-8 fathoms in ssindand gravel: 15 fathoms. 



Body ovate, broad anteriorly, and tapering to a narrow pointed 

 extremity: alx)ut two and a half times longer than broad. 7 mm. :17 

 mm. Length of abdomen nearly equal to half the length of entire 

 l)ody. 8 mm. : 17 mm. 



Lateral margins of head cleft, with the two lobes about equal in 

 size, the anterior one more rounded in outline, the posterior one more 

 acute: the posterior lobe is not produced at tlie sides beyond the ante- 

 rior one. The front of the head is deeply excavate between the antero- 

 lateral lobes, and there is a small median excavation. The eyes are 

 distinct, small and round, compound in structure, dorsally placed at 

 the base of the lateral cleft. The tirst antenna? have the basal article 

 enlarged, about twice as wide as the second article and very little 

 longer: the third article is one and a half times longer than the second: 

 the fourth article is just a little longer than the third. The first antenna? 

 extend to the middle of the fourth article of the peduncle of the second 

 pair of antenna^. The basal article of the second antenna? is almost 

 inconspicuous: the second, third, and fourth articles are all short, about 

 equal in length, although the second is nearly twice as wide as the two 



''The desc'ription is from a small specimen. In tlie a-lnlt the flairt'llum c-onsists of 

 more joints. 



