. Bulletin - United States National Museum. Science. 378 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. but from that species in the shape and greater size of the tubercles in front of the eyes, the tuljercles being- hook-shaped and ver}' prominent in /S. riUeri and projecting far in front of the anterior margin of the head, while in S. consoJidata the}' are small (iStimpson speaks of them as being minute), are not hooked, and do not project any considerable distance in front of the anterior margin of the head; in the greater size of the two median tubercles on the anterior division of t
. Bulletin - United States National Museum. Science. 378 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. but from that species in the shape and greater size of the tubercles in front of the eyes, the tuljercles being- hook-shaped and ver}' prominent in /S. riUeri and projecting far in front of the anterior margin of the head, while in S. consoJidata the}' are small (iStimpson speaks of them as being minute), are not hooked, and do not project any considerable distance in front of the anterior margin of the head; in the greater size of the two median tubercles on the anterior division of the head (Stimpson does not mention these tubercles in his descrip- tion, but in the specimens sent to the U. S. National Museum from ^ jj Pacific Grove, California, by Mr, J. (). Snyder, and which Dr. James E. Bene- dict has identitied with S. cnnsolidafa and figured in his paper on the genus Synidotea,"' these tubercles are pres- ent, but very minute; they do not FIG. ,,, ABDOMEN OF SYNIDOTEA ovcrhaug thcfroutal emargination); TERi. h, Abdomen of Synidotea con- in the shape of the terminal segment of the body, it ]>eing much broader, and tapering very gradually to a broadly rounded extremit}', which has a slight median notch or excavation in S. rltterl, while in S. co7i- KoJidatd the terminal segment of the bod}^ is narrower and tapers to an extremit}' marked by two pronounced teeth or angulations separated f)y a deep median notch. Specimens of the same size were taken in making the above com- parisons. This species is named for Dr. William PI Ritter, of the University of California, from whom the specimens were received. SYNIDOTEA PALLIDA Benedict. Synidotea pallida Benedict, Proc. Acad. Nat. Sci. Phila., 1897, pp. 396-397.— Richardson, Proc. U. S. Nat. Mus., XXI, 1899, p. 848; Ann. Mag. Nat. Hist. (7), IV, 1899, p. 268; American Naturalist, XXXIV, 1900, p. 227. Locality.—Chirikof Island, Alaska. DepfL^em fathoms. Body narrow, elongate, about two and a h
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