3(50 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



lateral angles of this segment are produced forward so as to surround 

 the posterior portion of the head. The following segments are sub- 

 equal in length, with the exception of the seventh, which is a little 

 shorter than any of the others. Epimera are distinctly separated on 

 all the segments with the exception of the first. The epimera of the 

 second and third segments occupy half the lateral margin of the seg- 

 ments, being 2 mm. in length. The epimeron of the fourth segment is 



2^ mm. in length, the lateral margin 

 of the segment showing below it being 

 i mm. in length. The epimera of 

 the fifth and sixth segments occupy 

 three-fourths of the lateral margin, 

 being 3 mm. in length, the lateral 

 margin of the segment below them 

 being 1 mm. long. The epimeron of 

 the seventh segment only occupies the 

 entire lateral margin. The first three 

 epimera are extremely narrow, being 

 only i mm. wide. The last three are 

 1 mm. wide in the region of their 

 greatest breadth. 



The abdomen is composed of three 

 segments, two short ones and a long 

 terminal segment, which has a suture line on either side at the base 

 indicative of another partly coalesced segment. The abdomen is twice 

 as long as wide, being 14 mm. long and 7 mm. wide at the base, and 

 is one-third the length of the entire body. The terminal segment has 

 nearly subparallel sides. Its posterior margin is produced in a median 

 point, which is strong and acute. The post-lateral angles are rounded. 

 All the legs are similar in character. 



There are two specimens, one imperfect, from Santa Barbara, Cali- 

 fornia. 



This species is named for Dr. J. Walter Fewkes, zoologist and 

 ethnologist, who collected the specimens. 

 The type is in the Museum of Comparative Zoology, Cat. No. 6730. 



FIG. 388. IDOTHEA FEWKESI. a, MAXILLI- 



PED. x 16}. 6, FIRST ANTENNA, x 15}. 



IDOTHEA RECTILINEA Lockington. 



36. 



Idotea rectilinea LOCKINGTON, Proc. Cal. Acad. Sci., VII, 1877, Pt. 1, p. 



MIERS, Jour. Linn. Soc. London, XVI, 1883, p. 34. 

 Idotea rectilineata RICHARDSON, Proc. U. S. Nat. Mus., XXI, 1899, p. 845; Ann. 



Mag. Nat. Hist. (7), IV, 1899, pp. 264-265; American Naturalist, XXXIV, 



]900, p. 226. 



Localities. Pacific coast from Humboldt County, California, to 

 Ensenada, Lower California. 



Depth. 30 to 40 fathoms, in sandy mud. 



