ISOPODS OF NORTH AMERICA. 



369 



b. Terminal segment of body regularly and broadly rounded at its posterior 

 extremity, with a very small and obtuse median tooth. Epimera of the sec- 

 ond, third, and fourth segments do not extend ([uite the entire length of the 

 segments. Those of the following segments occupy the entire lateral margin. 



Pentidotca trosnexentikii (Brandt) 



//. Terminal segment of body with pronounced post-lateral angles, which are 



rounded, and with a distinct and acute median tooth at its i)osterior 



extremity. 



c. Sides of thorax parallel. Eyes about twice as wide as long. p]pimera of all 



the segments, from the second to the seventh, inclusive, occupy the entire 



lateral margins of the segments Pentldotea vfiitei ( Stimpson ) 



c^. Sides of thorax arcuate. Eyes transversely elongated, being live times wider 

 than long. The first three epimera do not quite reach the post-lateral 

 angles of the segments Pentidotea stenops ( Benedict) 



PENTIDOTEA RESECATA (Stimpson). 



Idotea re^ecata Stimpson, Bost. Jour. Nat. Hist., VI, 1857, j). 504, pi. xxii, tig. 7; 

 Proc. Bost. See. Nat. Hist., 1859, p. 88. — Miers, Jour. Linn. Soc. London, 

 XVI, 1883, p. 45.— Richardson, Proc. U. S. Nat. Mus., XXI, 1899, p. 844; 

 Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 263-264; American Naturalist, 

 XXXIV, 1900, p. 226; Harriman Alaska Exp., Crust., X, 1904, p. 216; Proc. 

 U. S. Nat. Mus., XXVII, 1904, p. 661; Bull. U. S. Fish Comm., 1905, p. 216. 



Localities. — Straits Juan cle Fuca, opposite Port Townsend, Van- 

 couver Island; Fort Rupert and Barclay Sound, British (V)luin])ia; (xulf 

 of Georgia, Orcas Island; Ottar Bay, Pender If^land; Pacific (Jrove; 

 Santa Barbara; San Pedro; Humboldt Bay, and 

 Monterey Bay, California; Tomales Bay, Cali- 

 fornia; Kilisut Harl)or, Port Townsend; Mawaw- 

 shone Point, near Port Townsend; Quarantine 

 Dock, Port Townsend; Karta Bay; (xulf of 

 Georgia, 



Depth. — Surface to 3^ fathoms. Foiuid he- 

 t^veen high and low tide lines among rocks, sea- 

 weed, kelp, eelgrass, etc. 



Body narrow, elongate, four and a half times 

 longor than wide, 8 nun.: 36 nun.; length of 

 abdomen one-third that of entire bod}', 12 mm.: 

 36 nmi. 



Head but little wider than long, with frontal 

 margin slightly excavate. Eyes moderately 

 large, round, compound in structure, and situated 

 just in front of the median transverse line on the 

 anterior portion of the head, and at the extreme 

 lateral margin. First pair of antenna? with the 

 basal articles greatly enlarged. The three following articles are 

 slender and about equal in length to each other and to the l)asal 

 article. The first antennse extend to the end of the third article of the 

 peduncle of the second pair of antenna?. The basal article of the sec- 

 ond antennte is short and almost inconspicuous from a dorsal view; the 

 28589—05 24 



Fig. •400. — Pentidotea re- 

 SECATA (After Sti.mp- 



SON). X \\. 



