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 quite the entire length of the 

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



Pentidotea wosnesenskii (Brandt) 



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

 rounded, and with a distinct and acute median tooth at its posterior 

 extremity. 



c. Sides of thorax parallel. Eyes about twice as wide as long. Epimera of all 

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



lateral margins of the segments Pentidotea. whitei (Stimpson ) 



(/. Sides of thorax arcuate. Eyes transversely elongated, being five 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 resecata STIMPSON, Bost. Jour. Nat. Hist, VI, 1857, p. 504, pi. xxn, fig. 7; 

 Proc. Bost. Soc. Nat. Hist., 1859, p. 88. MIERS, Jour. Linn. Soc. London, 

 XVI, 1883, p. 45. RrcHARDsoN, 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 de Fuca, opposite Port Townsend, Van- 

 couver Island; Fort Rupert and Barclay Sound, British Columbia; Gulf 

 of Georgia, Orcas Island; Ottar Bay, Fender Island; Pacific Grove; 

 Santa Barbara; San Pedro; Humboldt Bay, and 

 Monterey Bay, California; Tomales Bay, Cali- 

 fornia; Kilisut Harbor, Port Townsend; Mawaw- 

 shone Point, near Port Townsend; Quarantine 

 Dock, Port Townsend; Karta Bay; Gulf of 

 Georgia. 



Depth. Surface to 3 fathoms. Found be- 

 tween high and low tide lines among rocks, sea- 

 weed, kelp, eelgrass, etc. 



Body narrow, elongate, four and a half times 

 longer than wide, 8 mm.: 36 mm.; length of 

 abdomen one-third that of entire body, 12 mm.: 

 36 mm. 



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 FIG. 400. PENTIDOTEA RE- 

 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 basal 

 article. The first antenna? extend to the end of the third article of the 

 peduncle of the second pair of antennae. The basal article of the sec- 

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

 2858905 24 



SECATA (AFTER STIMP- 

 SON). X \\. 



