IH85.T PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 393 



401. Tetrodon fiirthi * Steindachuer. P. 

 Paiiauia {Steind.). 



402. Tetrodon angusticeps * Jonyns. 



(CantliOf/aster lohatna Steiud.) 



Panama {Bradley) ; Altata [Steind.) ; Galapagos (Jenyns), 



184. AROTHRON MuUer. 

 (Ovum Bloch & Schneider; preoccupied.) 



403. Arothron erethizon* Jordan & Gilbert. P. 

 Panama (Bradley). 



185. PSILONOTUS Swainson. 



404. Psilonotus puuctatissimus * Giiutber. 



{Tetrodon oxyrhynvhus Lockingtou.) 



Cape San Lucas [Xantus) ; Panama [Gthr.) ; Gulf of California (Lock- 

 ington). 



Family 67.— DIODONTID^. 



186. DIODON Linnaeus. 



405. Diodon hystrix * t Liuuteus. M. 

 (West Indies, &c.) 



406. Diodon liturosUs * t Shaw. 

 Lower California. 



Family 68.— ORTHAGORISCID^. 



187. MOLA Cuvier. 



407. Mola mola * t Linuseus. M. 

 Common. 



OBSERVATIONS. 



According to the above list it appears that of 407 species of fishes, 

 now known from the Pacific coasts of Mexico and Central America, 71 

 species or 17^ per cent, are found also on the Atlantic coasts. If we 

 add to this some 800 species, now known from the Caribbean Sea and 

 adjacent shores, we have about 6 per cent, of the whole number known, 

 as common to the two coasts. This number, 71, is not very definitely 

 ascertained, as there must be considerable difference of opinion as to 

 the boundaries of species, and as several of these species regarded as 

 common are open to doubt and need verification. I believe, however, 

 that fuller investigations will not increase the proportion of common 

 species, and, if it does not, the two fauna; show no greater resemblances 

 than the similarity of physical conditions on the two sides would lead 

 us to expect. 



This conclusion is opposed to those of Dr. Giinther (Fishes of Central 



