378 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



but differs from that species in the shape and greater size of the 

 tubercles in front of the eyes, the tubercles being hook-shaped and 

 very prominent in S. ritteri and projecting far in front of the anterior 

 margin of the head, while in S. consolidata they are small (Stiuipson 

 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 

 a b Pacific Grove, California, by Mr. J. (). 



Snyder, and which Dr. James E. Bene- 

 dict has identified with S. consolidata 

 and figured in his paper on the genus 

 Synidoteaf these tubercles are pres- 

 ent, but very minute; they do not 



FIG. 4ii.-, ABDOMEN OF svMDOTEA KIT- overhang thefrontal emargination); 

 TEEI. b, ABDOMEN OF SYNIDOTEA CON- in the shape of the terminal segment 



of the body, it being much broader, 



and tapering very gradually to a broadly rounded extremity, which 

 has a slight median notch or excavation in S. ritteri, while in S. con- 

 solidata the terminal segment of the body is narrower and tapers to an 

 extremity marked by two pronounced teeth or angulations separated 

 by a deep median notch. 



Specimens of the same size were taken in making the above com- 

 parisons. 



This species is named for Dr. William E. 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. 



Depth. 695 fathoms. 



Body narrow, elongate, about two and a half times longer than wide, 

 5 mm.: 12 mm. Length of abdomen equal to less than half the length 

 of the entire body, 5 mm. : 12 mm. 



Head with the front excavate between the antero-lateral angles. The 

 sides of the head are produced in a wide border, the exterior margin of 

 which is straight. There are four tubercles on the anterior portion of 

 the head, two in the center, one on either side of the median longitu- 

 dinal line, and two lateral to these, one in front of each eye. The 

 eyes are round and composite, and placed at the base of the lateral 



Proc. Acad. Nat. Sci. Phila., 1897, p. 393. 



