PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 29 



LABRID^. 



33. Pimelometopon pulcher (Ayres) Gill. 



Yeiy abundaut in the kelp outside the bay. 



SPHYR^NID^. 



34. Sphyraena argentea Girard. 



Yery abundant outside the bay in the fall. 



ATHERINID^. 



35. Chirostoma californiense (Girard) Gill. 

 Exceedingly abundant. 



36. Atherinops affinis (Ayres) Steindachner. 

 Scarcely less common. 



37. Leuresthes tenuis (Ayres) Jor. & Gilb. (geu. nov.) 



LeurestJieSj gen. nov., allied to Atherinops Steindachner, but with the 

 teeth wanting or reduced to slight or deciduous asperities. In the spe- 

 cimens which we have obtained of this species no teeth whatever are 

 observable. 



The much greater wddth of the posterior portion of the premaxillary 

 in Chirostoma, Aiherinops, and Leuresthes serve to distinguish these 

 genera from Atherina, in addition to the differences in the form of the 

 mouth. Lahidesthes Cope has, like Atherina, a slender premaxillary, 

 but the mouth is curved and the jaws much produced forwards. The 

 group called by Girard Heterognatlius has likewise a broad premax- 

 illary. It is probably not separable generically from Chirostoma, 

 although the lower jaw is much stronger and some teeth are present on 

 the vomer. 



Leuresthes tenuis is occasionally taken in San Diego Bay, but it is 

 much less abundant than the others and attains a smaller size. 



MUGILID^. 



38. Mugil mexicanus Steindacliner. 



Very abundant in San Diego Bay. Our specimens have the anal III, 

 8, instead of III, 7, as stated by Dr. Steindachner. 



SCOMBERESOCID^. 



39. Hemirhamphus sp. incert. 



The young of a species of Hemirhamphus is very abundant in San 

 Diego Bay. We are at present unable to identify it with any of the 

 known species, but having seen no specimens over four inches long, we 



