NATURAL SCIENCES OP PHILADELPHIA. 331 



TETRAODONTOIDS. 



Gastrophysus Miiller. * 



Gastrophysus politus. Syn. Tetraodon politus Girard. 



STURIONOIDS. 

 Antaceus Fitz. and Heckel. 

 Antaceus brachyrhynchus. Syn. Acipenser brachyrhynchus Ayres. 

 Antaceus transmontanus. Syn. Acipenser transmontanus Rich. 

 Antaceus medirostris. Syn. Acipenser medirostris Ayres. 

 Antaceus acutirostris. Syn. Acipenser acutirostris Ayres. 



CHIM^ROIDS. 



Hydrolagus Gill. 

 Distinguished from Chimaera on account of the absence of an anal fin and 

 the triple division of the sexual organs of the male. 



Hydrolagus colliei. Syn. Chimaera colliei Lay and Bennett. 



HETERODONTOIDS. 



Gyropleurodus Gill. 

 Gyropleurodus francscii == Cestracion francisci Grd. 



MYLIOBATOIDS. 

 Holorhinus Gill. 

 This genus is founded on a species which differs from Myliobatis by the 

 transverse entire snout. The median teeth are very broad, and the lateral 

 hexagonal ones have nearly equal sides. 



Holorhinus vespertilio. Syn. Rhinoptera vespertilio Girard. 



PETROMYZONTOIDS. 

 Lampetra Gray. 

 Lampetra plumbea. Syn. Petromyzon plumbeus Ayres. 



Entosphenus Gill. 

 Entosphenus tridentatus = Petromyzon tridentatus Rick. = P. lividus Grd. 

 " epihexodon = " tridentatus Grd. (nee Rich.) 



" ciliatus = " ciliatus Ayres. 



" astori = " astori Grd. 



The following list of the genera belonging to the Fauna of the Western coast 

 of America north of Cape San Diego, not presented in Dr. Girard's Report, 

 and exclusive of those in my " Notes," may be of use : 



Percoids. Stereolepis Ayres. 

 Pimelepteroids. Girella Gray. 



Sci^noids. Rhinoscion Gill (vice Amblodon Grd.) Menticirrhus Gill (vice 

 Umbrina Grd. fide spec.) Genyonemus Gill (vice Leiostomus Ayres, 

 Grd.) Atractoscion Gill. Cynoscion Gill, (Ayres.) Seriphus Ayres. 



Labroids. Semicossyphus Gthr. Chcerojulis Gill. 



Embiotocoids. Hypsurus A. Ag. Holconotus Ag. Cymatogaster Gib. (vice 



Holconotus Grd.) Hyperprosopon Gib. (vice Ennichthys Grd.) Hypo- 



critichthys Gill. Brachyistius Gill. 



Carangoids. Naucrates Rctf., Gthr. 

 Stromateoids. Poronotus Gill, (Ayres.) 

 1862.] 



