266 Miss H. Richardson on the Tsopods of the 



IJah. Awaatscli Bay, Sea of Ochotsk ; north-west coast of 

 North America to Vancouver Island {Miers). 



43. Idotea stenops, Benedict. 



Idotea stenops, Benedict, Proc. Biol. Soc. Washington, xii. 1898, 

 pp. 54, 55. 



Hah. Monterey, California. 



44. Idotea Whitei, Stimpson. 



Idotea Whitei, Stimpson, Proc. Acad. Nat. Sci. Philad. 1864, p. 155 ; 

 Miers, Journ. Linn. Soc. London, Zool. xvi. 1883, pp. 42, 43. 



IJab, Paget Sound; Monterey Bay, California, collected 

 by Mr. Heath. 



A specimen from Monterey Bay, California, agrees with 

 Miers's description of two males received from California, 

 which he refers to this species. It is unlike Idotea IVosne- 

 senshii in the following points, and from an examination of a 

 large number of individuals of I. Wosnesenshii, in which 

 these points remain constant^ it seems to demonstrate the 

 impossibility of uniting the two species : — 



1. " Form of epimera of second to fourth thoracic segments, 

 wdiich reach quite to the postero-lateral angles of these 

 segments. 



2. " Ej)imera of the second segment are broader anteriorly, 

 and the terminal segment more resembles ih^to^ I. ochotensis, 

 being more angulated and less rounded at the postero-lateral 

 angles " *. 



3. The absence of hairs on the legs. 



The legs of I. Wosnesenskii (the males) are thickly covered 

 with hairs and very bushy in appearance. 



4. The smooth margins of the epimera, which in 7. JVosne- 

 senskii have thickened edges. 



19. Synidotea, Harger. 



Analytical Key to the Species q/ Synidotea f. 



a. Abdomen emarginate or notched at its 

 distal end. 

 b. Two spine.s or tubercles overhanging 

 the frontal notch. 

 c. Spines united near the base 45. 5. pallida, Benedict. 



Columbia," ii. 1860, p. 282) refers, without any description, specimens from 

 Esquimault Harbour, British Colunbia, to Jdotia stricta, Dana; it is far 

 more probable that they belong to Idotea ochotensis." 



* Miers, Journ. Linn. Soc. London, Zool. .\vi. ISs], pp. 42, 43. 



t Benedict, Proc. Acad. Nat. Sci. Philad. (1897 J, p. .391. 



