172 Miss H. Richardson on the Isopods of the 



16. Livoneca califbrnica, SchioJte & Meinert. 



Livoneca californica, Schiodte & Meinert, Naturhistorisk Tidsskrift, 

 xiv. 1883-84, pp. 372-374, pi. xvi. figs. 1, 2. 



hah. Shores of California, near Sail Francisco. 



17. Livoneca vulgaris^ Stimpson. 



Livoneca vulgaris, Stimpson, Journ. Bost. Soc. Nat. Hist. xxii. 1857, 

 p. 68, pi. xxii. fig. 9 ; Schiodte & Meinert, Naturhistorisk Tids- 

 skrift, xiv. 1883-84, pp. 344-349, pi. xiv. figs. 1, 2. 



Hah. Shores of California, near San Francisco, to Santa 

 Margarita Island, Lower California. 



18. Livoneca pannmensis, Schiodte t^ Meinert. 



Livoneca panamensis, Schiodte tfe Meinert, Naturhistorisk Tidsskrift, 

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



Hah. Mazatlan ; west shores of Central i\mcrica ; Panama. 



10. Nerocila, Leach. 



19. Nerocila californica, Schiodte & Meinert. 



Nerocila californica, Schiodte & Meinert, Naturhistorisk Tidsskrift, 

 xiii. 1881-83, pp. 72-76, pi. v. figs. 12, 13, pi. vi. figs. 1, 2. 



Hah. San Diego, California ; Panama Bay. 



11. Anilocra, Leach. 



20. Anilocra occidentalism sp. n. 



Body two and a 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 j)air of antennae are composed of eight 

 joints and extend to the middle of the first thoracic segment. 

 The second pair of antennse are composed of nine joints and 

 extend to the posterior angle of the first thoracic segment ; 

 they are more slender than the first pair of antennse. 



The first thoracic segment is trisinuated on its anterior 

 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 somewhat narrower than the 

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



