NO. 1369. XA TURA L nisTOR Y O F THE JSOroDA -RR IIARDSOX. 663 



The abdomen consists of three distinct soj^ments, with suture lines 

 on either side of another coaU'sced segment. 'Vhv third or terminal 

 segment has sul)paraUcl sides to al)()ut the michlle. wIkmv the segment 

 gradually l)ecomes narrower to a truncate extremity. On the poste- 

 rior margin of the terminal segment is a faint indication of a double 

 eraargination on either side of an obtuse median point. 



Legs small and slender and devoid of hair.s. 



The five small specimens and one large one agree in having the 

 terminal segment as described above. The two larger specimens show 

 the emargimition more distinctly, one of the specimens more so than 

 the other. Figures, showing all three variations, are given. 



The specimens agree in all other characters. 



Dana's specimens were collected by Prof. J. Le Conte on the coast 

 of California. 



IDOTEA WOSNESENSKII Brandt. 

 Jdofea vmnesenskii Br.^ndt, Muldemiorff's Sibirinche Reise, II, Pt. 1, 1851, Crust., 



Jdot!a MHipes Dana, Cr. U. S. Expl. Exp., XIV, Pt. 2,1853 p. 704 pl. xlvi, fig. 6. 

 Jdotea oregonen.vs Dana, Proc. Acad. Nat. Sci., Philad., ^ II, 1854, pl-o. 

 Idotea wosnesenskli Stimpson, Bo.t. Journ. Nat. Hist., ^ I, 18o<, p. oU4. 

 Jdotea womesenskn Spence Bate, Lord's Naturalist in Bntish Columbia, II, 18b., 

 p. 281.-MIERS, Journ. Linn. Soc. London, XVI, 1883, p. 40.-RKnARnsoN, 

 Proc. IT. S. Nat. Museum, XXI, 1899, p. 846. 

 Zr.cY/^'^.V6'.-Dutch Harbor on Unalaska Island; Humboldt Bay on 

 Fopof Island; Yakutat; Garforth Island in Muir Inlet, and Mtka, 

 Alaska; Beaver Cove, on Vancouver Island; (Harriman Alaska Ex- 

 pedition.) Lands End, California. (Dr. Ritter and party.) 



IDOTEA STENOPS Benedict. 



Idotea stenop. Benedict, Proc. Biol. Soc. ^Vashington XII, 1898, pp. 54-55.- 

 RiCHARDSON, Proc. U. S. Nat. Museum, XXI, 1899, p. 846. 

 Locality not given. (Dr. Ritter and party.) 



IDOTEA OCHOTENSIS Brandt 



Idotea ochotensis Brandt, Middendorff's Sibirische Reise, II ^'- ^^^'^^J^^''']- 

 p 145, pl. VI, fig 33.-MIERS, Journ. Linn. Soc. London, 1883,^,^;^- 

 32-34, pl. I, figs. 8-10.-RicHAKnsoN, Proc. U. S. Nat. Museum, XXI. 1899, 

 p. 846. 

 Z«o.»..-La„d» E,Kl und Fort Point, Califo.ni. (Or. Rm.-r am 

 party.) Humboldt Bay on Popof Island, Alaska. (IIar,„nan .\la.k.> 

 Expedition.) 



SYNIDOTEA RITTERI, new species. 



Body, ovate in outline. Colo.-, yellow, ui.l, n,arUin,s of l.la.k; 

 terminal .segment almost entiivly l>laik. .,, i,.,^„ 



Hea,l wit!, prominent, rounded a„tero.lat..ral a„,.da lo,,-. :.( . e 

 of "hiel,, and just aUovc the eyes, is a conspi.u.n. horn-hk,. pr„,-e. 



