[SOI'ODS OF NORTH AMEKK^A. 199 



The last seo-uient of the alxloiuen is sliort. rnit>ulate, smooth al)ove, 

 and with two depressions at the ])ase. 



The uropoda are rather lonj^ and Uirge; the inner branch is a little 

 longer and wider than the outer branch and is posteriori}^ truncate; 

 both branches are crenulated on the extei'ior margin. 



Length, 23 mm." 



ROCINELA BELLICEPS ( Stimpson). 



J^ga bellict'jis HTiuvm's, I'roc. Acad. Nat. Sci. Phila., XVI, lSO-4, p. 155. 



^Egn (tlas^rui^ls Jmckisctos, Proc. Cal. Acad. Sci., VII, 1877, Pt. 1, p. 4(5. 



Rocimda ahm-ensh Richardson, Proc. Am. Philon. Soc, XXXVII, 1898, p. 11. 



Rochu'la hdllcej>s RicnARD.sox, Proc. V. S. Xat. Mns., XXT, 1899, p. 827; Ann. 

 Mag. Xat. Hist. (7), IV, 1899, p. 189; Anier. Naturalist, XXXIV, 1900, p. 

 219; Harriman Alaska Exp. Crust., X, p. 2U; Proc. U. S. Nat. Mus., 

 XXVII, 1904, p. 214; Bull. U. S. Fish Comm., XXIV, 1905, p. 213. 



Localitleii. — Cortes Bank, California to Alaska 

 and Bering Sea; Yakutat, Alaska; Unalga Pass, 

 Aleutians. 



Parasite of cod and seulpin; from the tish 

 Ihidi'oJiKi^ix colli el. 



• • , T-. I 1 1 ^"■- ^>*"— R'X-INEI.A BKI.I.I- 



Pepth. -5-088 fathoms. Kock}' beach under , ,,:,,s. itkad and .first 

 stones; shelly sand, mud, and gravef; in low •"^" thoracic se(;ments. 



•'2',. 



water; in l)r()wn and green nnid, red sand. 



Body oblong-ovate, a little more than twice as long as wide, 10 nun. : 

 22 nun. 



«The above description is adapted from the following one of Schioc'dte and 

 Meinert's: 



Breviter ovata, supra prjcter puncturam ordinariam i)iinctis minutis, perraris 

 sparsa; segnientuni dorsale annuliquarti trunci ntriiKiuc macula obscura, suboceilata 

 ornatum; annulus analis ad basin utrinque macula (il)scura notatus. 



Frons triangula, apice late obtusa, supra iccjuata. 



Lamina fnmtalis minuta, angustc rliomboidalis. 



Oculi minuti, ]>entag()ni, tertia parte latitndinis capitis distantes. Antenn<ie primi 

 paris articulis quaternis ultimis angulum priorem annuli ])rimi trunci superantes, 

 scapo tertiam partem articuli (juarti, flagello articulum (luintum antenuarum secundi 

 paris explentes; flagellum 6-articulatum, articulo primo quam secundo j)aulo longiore, 

 articulo ultimo minimo. 



AntenmB secundi paris epimerum primum explentes; flagellum 15-articulatum. 

 Segmentum dorsale annuli primi trunci ante leviter bisiiuiatum. 



Epimera majuscula, latiuscula; anguli postici ei)imerorum posteriorum acuti, valde 

 producti; epimerum ultimum duas partes annuli secundi caudalis explens. 



Pedes ])rens()rii breves: femora brevia, aculeis ternis quaternisve crassiusculis, 

 obtusis armata; tarsi in acie aculeis quaternis longis, acutis instructi; ungulic 

 majuscuhe, gracilis, quadricarinatfe, admodum incurvfc, inter se sub;c(iuales. Pedes 

 gressorii longiusculi crassiusculi, l)reviter spinulosi. Annulus primus caudalis fere 

 totus obtectus. 



Annulus analis breviter lingulatus, supra subanpiatus, ad basin bis impressus. 



Pedes anales longiusculi, magni; ramus interior quam exterior jiaulo longior at(|ue 

 latior, post truncatus; ramus uterque in latere exteriore crenulatus. 



Long. 23 mm. — Sciiiu<;i)te and Meinekt, Nat. Tidsskr. (3), XII, 1S79-S(), p. ,'{93. 



