298 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



Family LEUOOSIIDiE. 



KKY TO THE WEST AFRICAN GENERA OF THE FAMILY LEUCOSIID^. 



A. Merus of external maxillipeds more thau half the length of the ischium measured 



along the inner border; fingers stout, gradually narrowing from base to tip. 



B. Carapace subglobular, convex, the regions usually not distinctly delimited, 



but merged into the general convexity Phihira. 



B'. Carapace polygonal; surface broken or nodular; regions delimited by grooves 



or inequalities of level Ehalia. 



A'. Merus of external maxillipeds half or less than half the length of the ischium 

 measured along the inner border; fingers slender, almost of same diameter 

 from base to tip , Leucosia. 



Genus PHILYRA Leach. 



KEY TO THE WEST AFRICAN SPECIES OF THE GENUS PHILYRA. 



A. Carapace with a lateral dorsal crest cristata 



A'. Carapace without a lateral dorsal crest Iwvidorsalis. 



PHILYRA CRISTATA Miers. 

 Phllyra cristata Miers, Ann. Mag. N. H. (5), VIII, 1881, p. 263, pi. xv, fig 1. 



West African locality. — Goree Bay, Senegambia, 9 to 15 fathoms 

 (Miers). 



PHILYRA LiEVIDORSALIS Miers. 

 Philyra Iwvidorsalis Miers, Ann. Mag. N. H. (5), VIII, 1881, p. 264, pi. xv, fig. 2. 



West African locality. — Goree Bay, Senegambia, 9 to 15 fathoms 



(Miers). 



Genus EBALIA Leach. 



KEY TO THE WEST AFRICAN SPECIES OF THE GENUS EBALIA. 



A. Exognath of outer maxilliped reaching the distal end of the merus of the 

 endognath r affinis. 



A'. Exognath of outer maxilliped not reaching the distal end of the merus of the 

 endognath tuberculata. 



EBALIA TUBERCULATA Miers. 



Ebalia tuberculata Miers, Ann. Mag. N. H. (5), VIII, 1881, p. 266, pi. xiv, fig. 3. 



West African locality. — Goree Bay, Seuegambia, 9 to 15 fathoms 

 (Miers). 



EBALIA AFFINIS Miers. 



Ebalia affinis Miers, Ann, Mag. N. H. (5), VIII, 1881, p. 268, pi. xiv, fig. 4. 



West African locality. — Goree Bay, Senegambia, 9 to 15 fathoms 

 (Miers) . 



