260 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



The third and fifth are subequal, each being 2 mm. in length. The 

 seventh is the shortest, being 1 mm. long. The epimera are distinctly 

 separated on the last six segments. They are narrow 

 plates, extending the full length of the lateral margins 

 of the segments. 



The abdomen is not narrower than the last thoracic 

 segment. The first segment is covered at the sides 

 by the seventh thoracic segment. The terminal seg- 

 ment is nearly twice as wide as long, 5 mm. : 9 mm. 

 and is widely rounded posteriorly. The uropoda are 

 as long as the terminal segment. Both branches are 

 of equal width and length, and are alike in shape, ter- 

 minating in rounded extremities. 



The legs are all prehensile, and are furnished with 



FIG. 270. LIVONECA F. . . 



VULGARIS. YOUNG long, narrow dact} r h. I he basis of the last four pairs 

 MALE - is produced in a not very high carina." 



LIVONECA CALIFORNICA Schicedte and Meinert. 



Livoneca californica SCHKEDTE and MEINERT, Naturhistorisk Tidsskrift (3), XIV, 

 1883-84, pp. 372-374, pi. xvi, figs. 1-2. RICHARDSON, Proc. U. S. Nai. Mus., 

 XXI, 1899, p. 829; Ann. Mag. Nat. Hist. (7), IV, 1899, p. 172; Amer. Nat, 

 XXXIV, 1900, p. 221. 



Localities. Shores of California, near San Francisco; Fort Point, 

 San Francisco, California; off Point Nuevo, California; San Pedro, 

 California; South Belmont Oyster Beds, San Francisco Bay, Califor- 

 nia; Santa Cruz, California. 



Parasite of "shiner." 



Body oblong-ovate, a little more than twice afs long as wide, 7 mm. : 

 16 mm., and twisted somewhat to one side, the right side being 

 shortened. 



The head is as wide at the base as it is long, 2 mm. : 2 mm. , and is 

 somewhat triangular, becoming gradually more narrow to an apex 

 which is \ mm. wide and narrowly rounded. The eyes are large, 

 oval, composite, and situated in the post-lateral angles of the head; 

 they are separated anteriorly by a distance equal to the length of one 

 eye. The posterior margin of the head is rounded. The first pair of 

 antennae are composed of eight articles. The basal articles are not 

 contiguous, but the distance between them is very small, owing to the 

 narrowness of the anterior part of the head. The second pair of 

 antennae are composed of eight articles. They extend to the end of 

 the seventh article of the first pair of antenna? and are very slender 

 and feeble. The maxillipeds have a palp of two articles. The palp 

 of the mandibles is composed of three articles. 



For description of this form, the male, female, and the young of the first stage, 

 see Schioedte and Meinert, Nat. Tidsskr. (3), XIV, 1883-84,. pp. 344-349, 



