830 PROCEKDlNdS OF THE NATIONAL MUSEUM. vol.xxi. 



17. LIVONECA VULGARIS Stimpson. 



Livoneca vulyaria Stimpson, .Jonrii. Jios. Soc Nat. Hist., XXII, 1857, p. 68, pi. xxii, 

 fig. 9. — ScHKKDTK and Mkinekt, Naturhistorisk Tidsskrift, XIV, 1883-84, pp. 

 344-349,pl. XIV, fig8. 1, 2. 



Habitat. — Shores of California, near San Francisco, to Santa Margarita 

 Island, Lower California. 



18. LIVONECA PANAMENSIS Schicedte and Meinert. 



Livoneca panemen»is Schkedte aud Meinert, NaturhiHtorisk Tidsskrift, XIV, 

 1883-84, pp. 349-353, pi. xiii, figs. 11, 12. 



Habitat. — Mazatlan; west shores of Central America; Panama. 



10. NEROCILA Leach. 



19. NEROCILA CALIFORNICA Schicedte and Meinert. 



Nerocila californica Schkedtk and Meinert, Naturhistorisk Tidsskrift, XIII, 

 1881-83, pp. 72-76, pi. \', figs. 12, 13; pi. vi, figs. 1, 2. 



Habitat. — San Diego, California; Panama Bay. 



11. ANILOCRA Leach. 



20. ANILOCRA OCCIDENTALIS, new species. 



Body two and one-half times longer than broad. 



Head large, broader than long, one-half as broad as the first thoracic 

 segment, produced in front in a short, blunt process, whose anterior 

 edge is roundly truncate. Eyes large, situated at a 

 distance equal to almost half the width of the head 

 apart. The first pair of antenna' are composed of eight 

 joints and extend to the middle of the first thoracic 

 segment. The second pair of antenna' are composed 

 of nine joints and extend to tlie posterior angle of the 

 first thoracic segment; they are more slender than the 

 first pair of antenna;. 



The first thoracic segment is trisinuated on its an- 

 terior margin, and is one and a half times longer than 

 the second thoracic segment. The other segments are 

 subequal. The sixth and seventh segments are some- 

 ., . what narrower than the fifth, and the seventh is a little 



Fig. 7.— Anilocha ' 



OCCIDENTALIS. > 4. narrowor than the sixth. Allthe epimera are long 

 and narrow aud more or less rounded posteriorly; 

 thej' extend fully to the posterior angle of their corresponding seg- 

 ments, a character not found in any other species of the genus. 



The first abdominal segment is partly covered at the sides by the 

 last thoracic segment. The first five segments are about equal in 

 length and width. The terminal segment is slightly wider than long, 

 equal in length to the other abdominal segments taken together, is 

 impressed at the base, and posteriorly rounded. The uropoda are 



