ISOPODS OF NORTH AMERICA. 



353 



posed of four segments with lateral sutures at the base of the fourth, 

 or terminal segment, indicating another partly coalesced segment. 

 First three pairs of legs prehensile, with propodus dilated and dac- 

 tylus reflexed. Last four pairs of legs ambulator}^. 



Inner branch of uropoda half as long as inner branch. 



Species small. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS CHIRIDOTEA. 



a. First pair of antennae extend beyond the peduncle of the second antennae. Sec- 

 ond antennae short, extending only to the anterior margin of the first thoracic 

 segment. Front of head not excavate between the antero-lateral lobes, but 



slightly excavate in the middle of the anterior margin Chiridotea cseca (Say) 



b. First pair of antennae extend to the middle of the fifth article of the peduncle 

 of the second antennae. Second antennae long, extending to the posterior 

 margin of the sixth thoracic segment. Front of head deeply excavate between 

 the antero-lateral angles Chiridotea tuftsii (Stimpson) 



CHIRIDOTEA CJE.CA (Say). 



Idotea cseca SAY, Jour. Acad. Nat. Sci. Phila., I, 1818, p. 424. MILNE EDWARDS, 

 Hist. Nat. des Crust, III, 1840, p. 131. GUERIN, Iconog. , Crust. , 1843, p. 35. 

 HARGER with VERRILL, Report U. S. Com- 

 missioner of Fish and Fisheries, Pt. 1, 

 1873, p. 5(59 (275), pi. v, fig. 22. 



Chiridotea aeca HARGER, Am. Jour. Sci., XV, 



1878, p. 374; Proc. U. S. Nat. Mus., II, 



1879, p. 159; Report U. S. Commissioner 

 of Fish and 'Fisheries, Pt. 6, 1880, pp. 

 338-340, pi. iv, figs. 16-19. 



Glyptonotus csecus MIERS, Jour. Linn. Soc. 

 London, XVI, 1883, pp. 17-18. 



Chiridotea aeca RICHARD- 

 SON, American Natu- 

 ralist, XXXIV, 1900, 

 p. 226; Proc. U. S. 

 Nat. Mus., XXIII, 

 1901, p. 539. 



Localities. Florida; 

 New Haven, Connecti- 

 cut; Woods Hole, Massachusetts; Tarpaulin Cove, 

 Naushon; S. W. end of Campobello, New Brunswick; 

 Cohasset, Massachusetts; Long Island Sound; Vine- 

 yard Sound; Nantucket, Provincetown, Nahant, Mas- 

 sachusetts; Halifax, Nova Scotia; New England coast. 

 Depth. Surface; low water; shore; swimming in 

 fish weir; sand. 



Body ovate, broad and short, tapering to a pointed extremity; twice 



as long as broad, 4 mm. : 8 mm. Length of abdomen, one-half the 



length of entire body, 4 mm. : 8 mm. 



2858905 23 



PIG. 380. CHIKIDOTEA CMCA. (AFTER 

 HARGER). 



FIG. 381. CHIRIDOTEA 

 CMCA. MAXILLIPED. 

 X 51 1. 



