326 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



lislied iu tlie Proceedings of the Academy of Natural Sciences of Phila- 

 delphia (1854), and identifications of them have been carefully made by 

 Alexander A<>assiz (Proc. Boston Soc. Kat. Hist., 18<31, 122). By this 

 means the names given by Dr. Gibbons have taken their i^roper jjlaces 

 in synonymy. 



The descriptions published by Dr. Ayres have, on the contrary, not 

 been noticed, so far as I know, by any subse^pient author, not even by 

 Dr. Ayres himself, who soon after redescribed the same species as new, 

 apparently not considering the first publication as a sufficient one, as 

 one species at least received a new name on the second description. 



The following are the species in question : 



1. Leuciscns fjibhosus Ayros. 



Stouter aud thicker than any previously described species of the genus. Mouth 

 small. About GO scales in the lateral line. Brown above ; silvery below. Weight 

 about a pound. (Daily Placer Tunes and Transcript, issue of May 30, 1854. ) 



This description is not very explicit, but we are to remember that the 

 species was described from the fish market of San Francisco, and that 

 the five species th-en common in the markets were the subjects of the 

 five descriptions. The following species of Cyprinoid fishes are taken 

 in the Lovrer Sacramento Eiver, and are now, as then, abundant in the 

 market of San Francisco : Ptycliochilns orcgonensis, Ptychochilus vorax, 

 ^iboma crassicauda, Pogonichthys imvquilohus, Orthodon microlepidotus, 

 and CatostoDfuH occidentalis. 



The description of Leuciscuft gihhosus above quoted, as Avell as a more 

 elaborate one afterwards published of " Lavinia gibhosa^^^ applies to 

 Sihoma crassicauda only among the fishes which come to the San Fran- 

 cisco market. The name gibhosus was published in May, 1854 ; the name 

 enissicauda in August, 18 '54. We have therefore no alternative but to 

 drop the latter very characteristic name, and call the species Siboma 

 fjibbosa, or, perhaps better, Telestes gibbosa, for the robust caudal pedun- 

 cle hardly furnishes a sufficient reason for a genus Siboma. In Ayres's 

 time, as now, this species was knowni in tlie market as the " Chub." 



2. Lcuciscus microleiyidotus Ayres (1. c, May 30). 



This species, afterwards more fully described as Gila microlepidola, is the well-known 

 OrihocJon microlepidotHH. 

 :;. Leuciscus macroleindotus Ayres (1. c, May 30). 



Form much like that of Leuciscus pulchellHS, though a- little more slender. Aual fm 

 longer. Caudal much arcuated. Scales 60. Size of the preceding. 



This is evidently the species describecf in August of the same year by 

 Baird and Girard as Pogonichfhys imcquUobus^ under which name it was 

 afterwards mentioned by Dr. Ayres. 



It must therefore take the less appropriate name of Pogonichthys ma- 

 crolepidotits. This is now the '' Split-tail'" of the markets. 



4. Leuciscus (jracilus (^sic) Ayres (1. c, May .30). 



Body slender ; head much elongate. Color silvery, becoming darker on the back. 

 Scales about 80 ; much larger than any other Icnown Leuciscus, weighing, it is said, 30 

 poinids or more, but generally varying, as we find it iu the markets, fi'ora .5 to 20 

 pounds. This is the species here known as Salmon Ti-out, &c. " ** * 



