ISOPODS OF NORTH AMERICA. 199 



The last segment of the abdomen is short, Ungulate, smooth above, 

 and with two depressions at the base. 



The uropoda are rather long and large; the inner branch is a little 

 longer and wider than the outer branch and is posteriorly truncate; 

 both branches are crenulated on the exterior margin. 



Length, 23 mm. 



ROCINELA BELLICEPS (Stimpson). 



JEga belllceps STIMPSOX, Proc. Acad. Nat. Sci. Phila., XVI, 1864, p. 155. 



/Kga alascensis LOCKINGTON, Proc;. Cal. Acad. Sci., VII, 1877, Pt. 1, p. 46. 



Rocinela alascensis RICHARDSON, Proc. Am. Philos. Soc., XXXVII, 1898, p. 11. 



Rocinela bdliceps RICHARDSON, Proc. U. S. Nat. Mus., XXI, 1899, p. 827; Ann. 

 Mag. Nat. Hist. (7), IV, 1899, p. 169; Amer. Naturalist, XXXIV, 1900, p. 

 219; Harriman .Alaska Exp. Crust, X, p. 214; Proc. U. S. Nat. Mus., 

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



localities. Cortes Bank, California to Alaska 

 and Bering Sea; Yakutat, Alaska; Unalga Pass, 

 Aleutians. 



Parasite of cod and sculpin; from the fish 

 Ifydrolaqus colliei. 



r> ji t ^oo A u TD i u u j FIG - 187. ROCINELA BELLI- 



Lfeptfi. 5-688 fathoms. Kocky beach under CEPS . HEAD AND FIRST 

 stones; shelly sand, mud, and gravel; in low TWO THORACIC SEGMENTS. 



X 2} 



water; in brown and green mud, red sand. 



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



22 mm. 



The above description is adapted from the following one of Schicedte and 

 Meinert's: 



Breviter ovata, supra praeter puncturam ordinariam punctis minutis, perraris 

 sparsa; segmentum dorsale annuliquarti trunci utrinque macula obscura, subocellata 

 ornatum; annulus analis ad basin utrinque macula obscura notatus. 



Frons triangula, apice late obtusa, supra jequata. 



Lamina frontalis minuta, anguste rhomboidalis. 



Oculi minuti, pentagoni, tertia parte latitudinis capitis distantes. Antenna? primi 

 paris articulis quaternis ultimis angulum priorem annuli primi trunci superantes, 

 scapo tertiam partem articuli quarti, flagello articulum quintum antennarum secundi 

 paris explentes; flagellum 6-articulatum, articulo primo quani secundo paulo longiore, 

 articulo ultimo minimo. 



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

 Segmentum dorsale annuli primi trunci ante leviter bisinuatum. 



Epimera majuscula, latiuscula; anguli postici epimerorum posteriorum acuti, valde 

 producti; epimerum ultimum duas partes annuli secundi caudalis explens. 



Pedes prensorii breves: femora brevia, aculeis ternis quaternisve crassiusculis, 

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

 majuscula?, gracilis, quadricarinatee, admodum incurvpp, inter se subrequales. Pedes 

 gressorii longiusculi crassiusculi, breviter spinulosi. Annulus primus caudalis fere 

 totus obtectus. 



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



Pedes anales longiusculi, magni; ram us interior quam exterior paulo longior atque 

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



Long. 23 mm. SCHKEDTE AND MEINERT, Nat. Tidsskr. (3), XII, 1879-80, p. 393. 



