538 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



a'. Sides of head in a dorsal view entire and not laterally produced. Eyes lateral. 

 Legs all ambulatory; three anterior pairs with penultimate joint not or 

 not much dilated. 

 h. Flagellum of second pair of antennaj well developed and multiarticulate. 

 c. Pal])us of maxillipeds four-jointed. Epimera of all the segments well devel- 

 oped and evident in a dorsal view. Abdomen consisting of three segments 

 with lateral sutures indicative of another partially coalescent segment. 



42. Ilotrii. 



c' . Palpus of maxillipeds three-jointed. All the epimera coalesced and perfectly 



united with the segments. Abdomen consisting of one segment, uniartic- 



Tilate 43. Si/nldofea. 



}/. Flagellum of second pair of antenna? not multiarticulate. 



c. Flagellum of second pair of antenn;e obsolete. Second pair of antenna' much 

 longer than first pair. 

 d. Legs subequal. Antennre geniculate. Palp of maxillipeds four-jointed. 



Body angulate 44. ErlrJisoudla. 



(V. Third and fourth pairs of legs generally markedly shorter than anterior 

 pairs. Fifth, sixth, and seventh pairs gradually increasing in length. 

 Antennse not geniculate. Palp of maxillipeds two-jointed. Body slen- 

 der, linear, smooth 45. Clmntis. 



(/. Flagellum of second pair of antenna? rudimentary. Second pair of antennte 

 a little longer than first pair 48. luJolra. 



41. CHIRIDOTEA Harger. 



ANALYTICAL KKV TO THE SPECIES OF v'HIRIDOTEA. 



«. Species large, elongate-ovate. Outer ramus of uropoda (opercular valves) minute. 

 Joints of peduncle of antennse greatlj^ dilated; flagellum 7-8 jointed; antero- 



cervical lobes prominent 98. (Idrulotca xtdnni (Kr0yer). 



((\ Species small, orl)iculate-ovate. Outer ramus of uro])oda at least half as long as 

 inner. 

 //. Antemife little longer than antennules; flagellum seven-jointed. Eyes incon- 

 spicuous. Antennules longer than ])eduncle of antenna^. 



99. (Jiirldntea caeca (Say). 

 /;'. Antennpe twice as long as antennules; flagellum twelve-jointed. Eyes usually 

 distinct. Antennules do not surpass peduncle of antenna\ 



100. Chiridoteatuflm (Stimi)son). 



98. CHIRIDOTEA SABINI (Kr/jyer). 



Idotea sahini Kr0ver, Nat. Tidsskr. (2), II, p. 401. — Reinhardt, Fortegnelse over 

 Gronlands Krebsdyr, 1857, p. 34. — Lutken, List of Crust, of Greenland in 

 Arctic Manual, 1875, p. 149. — Sars, Arch. f. Math, og Naturvidensk., II, 

 1877, p. 350. 



Chiridotea megalura G. 0. Sars, Archiv. f. Math, og Naturvidenskab., IV, 1880, 

 p. 432. 



Glyptonotus sabini MiERs, Jour. Linn. Soc. Lond., XVI, 1883, p. 15-17, pi. i, fig. 

 3-5. — Axel Ohlin, Bidrag till kiinnedomen om Malakostrakfaunan i Baffin 

 Bay och Smith Sound, 1895, p. 13-14.— Richardson, Proc. U. S. Nat. Mus., 

 XXI, 1899, p. 844. 



Chiridotea sahini ST^BBBmci, Ann. Mag. Nat. Hist. (7), V, 1900, p. 14. 



Ilahifat. — Davis Straits; Repulse Bay, North America; Cape Dud- 

 lev Di.'-g-es; Cape Faraday; 73^ 43' N. lat., 78° 48' W. long.; 71° 57' N. 



