1496 Bulletin 47, United States National Museum. 



ostegals 5 ; scales rather large, silvery ; spinous dorsal very long, of about 

 16 spines, highest at the fifth or sixth, thence gradually shortened each 

 way, the last spines being shorter than the soft rays; anal spines stronger 

 than in the other genera, curved, the second spine being longer and 

 stronger than the first and third, which are nearly equal; soft rays of anal 

 20 to 23 in number, the anterior simply articulated. Fresh waters of Cal- 

 ifornia ; a most remarkable genus, with a single known species. ( vdrspa, 

 womb; naprtog, fruit.) 



1879. HYSTEROCARPUS TRASKI, Gibbons. 



Head 3 ; depth 2. D. XVI to XVIII, 11 : A. Ill, 22 ; lateral line 40. Body 

 oval, compressed ; doral outline strongly convex ; ventral curve less than 

 that of the back; head small; snout bluntly conic; profile from snout to 

 occiput concave; mouth small, oblique; maxillary not reaching orbit; 

 lower jaw included; lateral line following the curve of the back; dorsal 

 spines rather high, the fourth to seventh highest, the others gradually 

 lower each way, the last spine shorter than the soft rays; anal spines 

 strongly curved ; cheeks with 3 rows of large scales. Males above dark 

 brown, sides yellowish or olivaceous, with fine black dots; throat and 

 belly golden yellow ; females olivaceous darker above, with black blotches 

 on sides in irregular transverse bars. Rivers of Central California, chiefly 

 in the Sacramento Valley, from Lake County to Santa Clara County ; locally 

 abundant. (Named for Dr. J. B. Trask, of San Francisco, who sent 

 specimens to Dr. Gibbons.) 



Hysterocarpus traski, GIBBONS, Proc. Ac. Nat. Sci. Phila. 1854, 105, lagoons of the lower 

 Sacramento River (Coll. Dr. J. B. Trask) ; GIRARD, U. S. Pacific R. R. Survey, x, 190, 

 pi. 26, fig. 14, 1858; GUNTHER, Cat., iv, 251, 1862; JORDAN & GILBERT, Synopsis, 587, 

 1883 ; EIGENMANN & ULREY, Bull. U. S. Fish Comm. 1892, 399. 



Sargosomus flumatilis (AGASSIZ MS.) ALEXANDER AGASSIZ, Proc. Bost. Soc. Nat. Hist., 

 Viil, 1861, 130, Sacramento River. 



Dacentruslucens, JORDAN, Bull. IT. S. Geol. Surv., iv, 667, 1878, Sacramento River; errone- 

 ously ascribed to the Bio Grande, 



599. ABEONA, Girard. 



Micrometrus*\, GIBBONS, Daily Placer Times and Transcript, May 30, 1854 (aggregatus 



and minimus) . 

 Abeona, GIRARD, Proc. Ac. Nat. Sci. Phila. 1855,322 (trowbridgii^inimus). 



Body ovate or oblong, compressed ; head moderate ; mouth small ; the 

 jaws about equal; lips rather thin, the lower with a narrow frenum; 

 teeth in one principal series, besides which are often 1 or 2 other teeth, 

 stout, somewhat compressed, and incisor-like; all or most of the teeth 3- 

 lobed; gill rakers very slender, of moderate length; lower pharyngeals 

 scarcely concave behind ; the outer teeth small, conic, the rest large molars 

 closely appressed; scales large. Dorsal fin short and high; the spines 



* Mi/cp6s, small; /xeTpov, measure. 



] Equivalent to Cymatogaster, Gibbons, May 18, 1854, including the same species ; re- 

 stricted to minimus by Alexander Agassiz, 1861; a restriction perhaps not allowable, as 

 Micrometrus was an exact synonym of Cymatogaster. 



