[SOPODS (»K NORTH AM?^RirA. 



2V)7 



Alaska: Monto- 

 Sitka. Alaska: 



iicar Wraii^^ell. Alaska; Pu^^ct Sound; Ivyska Ilarhoi 

 rev Biiy, Calitoniia; iNIiddlcton Island; I'nalaska: 

 Bcrino" Island; Sanborn Ilarhoi'. 

 Naoai Island; Saj^inaw l>ay, 

 Alaska: North Cxrebnitzky. 



Foutid on boach at low tide; 

 1(» 1'2 fathoms, in i>-rav(d, sand, 

 and stones; rocky beach undcM' 

 stones; in nuid. 



l)ody ovate, twice as lono- jis 

 wide, 4 nini. : S mm. 



Head three times as wide as 

 lono-, 1 mm.: 8 mm., with the 

 frontal mar^-in l)i-sinuat(\ or ex- 

 cavati^ on either side of a small 

 nunlian point. Eyes small, round, 

 composite, and })lace(l in the 

 post-latiM'al anol(>s of the head. 

 The first antenna* have the basal 

 article laro-e; the second article 



is half as lonu- as the first; the third is one and a half times long-er 

 than the second. The Haoellum is composed of thirteen articles. 

 The first antenna^ extend to the posterior margin of the head. T'he 

 second antemia* have the ))asal article very short and almost inconspicu- 

 ous; th(^ second articde is about three times as lono- as the first; tlu' third 



*CJ^ 



Fl(i. 315.— EX()SPll.KRt)MA OKKGONENSIS (AFTER 



Dana), a. Sk(X).m> antenna, b, Ceneral kkure. 



r, ABOO.MEN (INDERSIDE). (.Vl.I. ENLARGED.) 



t'iG. 316.— EXOSPH.EROJIA OREGONENSIS. «, Ma.XILUPED. X 51f. h, MANDIBLE, PALP REMOVED. 



X 5]|. c, Mandible WITH PALP. -.Ml. (^ Frontal lamina and clypei's. x 61|. 



is alxnit as lono- as the second; the fourth is nearly twice as long as the 

 third; the fifth is as long as the fourth. The flagellum is composcnl of 

 thirteen articles. The second antennie extend to the i)osterioi' mar- 

 gin of the second thoracic segment. The maxilliped has a palp of five 

 articl(\s. Mandibles with a three-jointed palp. 



