104 Bulletin 4J, United States National Museum. 



c. Shields all rouphly striated and ridged; anal nearly as long as dorsal and almost 

 entirely behind it. D. 33 ; A. 22. Dorsal shields about 9; lateral about 26; 

 ventral about 8. Color decidedly greenish. medirostkis, 14G. 



cc Shields not roughly striated; anal a little more than ^^ length of dorsal and 

 almost entirely below it. D. 38 ; A. 27. Dorsal shields about 10; lateral 20; 

 ventral 9. Color grayish. STURIO, 147. 



hb. Space between dorsal and lateral shields with minute spinules in very many series. 



il. Last dorsal shield of moderate size, more than J^ the one before it. Anal ly^ in 

 dorsal and beginning below its middle. Dorsal shields about 15; lateral 38, 

 ventral 10. D. 35; A. 37. rubicundus, 148. 



(W. Last dorsal shield very small, less than }^ length of the one before it; dor.sal 

 shields 11; lateral 32; ventral 9. D. 41; A. 22. Anal entirely below dorsal and 

 3^2 as long. BUEvmusTiiUM, 14i». 



145. ACIPENSER TRANSMONTANUS, Richardson. 

 (WuiTE Sturgeon; Oregon Sturgeon; Sacramento Sturgeon.) 



Color dark grayish, scarcely olive tinged, and without stripes. Dor- 

 sal shields mesoceutrous, with a compressed bluntish spine, which is 

 anteriorly often serrated, and followed behind by a compressed keel. Skin 

 with stellate roughnesses, but smoother than in A. medirostiis. Space 

 between lateral shields with stellate plates of moderate size, in about 5 

 series interspersed with smaller ones ; last dorsal shield i length of one 

 before it. Snout sharp in the young, becoming rather blunt and shoi t 

 in the adult, when it is considerably shorter than the rest of the head. 

 Barbels rather nearer to the tip of snout than to the mouth. Gill rakeis 

 comparatively long, more than 3 times as high as broad, about 2G in 

 number. Upper lobe of tail with rhombic plates. First caudal fulcrum, 

 above and below, enlarged and granular. Lower lobe of caudal rather 

 sharp and long, not much shorter than upper. Dorsal plates 11 or 12 ; 

 lateral 36 to 50, usually about 44 ; ventral 10 to 12. Anal fin below dorsal, 

 its base about i as long. D. 45(44 to 48); A. 28 to 30. Depth Tin length ; 

 head 4. Pacific coast from Alaska south to Monterey, ascending the 

 Sacramento, Columbia, and Fraser rivers in large numbers in spring. 

 It reaches a weight of 300 to 600 pounds, and is largely used as food, but 

 is rather coarse, {transmonianus, beyond mountains.) 



Acipenser Iransmontnnnx, RiCHARnsoN, Fauna Bor. Amer., iii, 278, 1836; Fort Vancouver. 

 Acipenser hrachyrhyHchus, VMii acuUroslrh (young), Ayres, Proc. Cal. Ac. Sci., 1854, 15, 16, San 



Francisco. 

 Acipenser trnuKiiinntanm and hrachyrhynchiis, Gi'NTHER, Cat., viil, 336, 337, 1870. 

 Acipemer tranfrinoiilunits, Jordan & Gilbert, Synopsis, 86, 1883. 

 f Acipen^er aleuteitsis, 'FnzmoER & Ueckzl, Ann. Wien. Mus., 1836, Aleutian Islands, after 



Pallas. 

 Acipemer caryi, uyresi, and pnlnatni, DuMilRiL, Nouv. Arch. Mus., HI, 169, 171, 178, 18G7, San 



Francisco. 

 Acipetiser traiismoutamis, KiascH & Fordice, * Proc. Ac. Nat. Sci. Phila., 1889, 254. 



146. ACIPENSER MEDIROSTRIS, Ayres. 



(Green Sturgeon.) 



Color olive-green, with an olive stripe on the median line of the belly 

 and one on each side above the ventral plates, these stripes ceasing 



* This paper coDtaiusdescriptioDS and synonymy of all the Auujricau Sturgeons. 



