1. ACIPEN8T5R. 335 



1. Acipenser nxthemis. 



Sterlet. 



Mnrsil. Damib. Pnnnon, Mijs. iv. p. 35, tab. 11. fig. 2 (adult), .ind 

 tig. 1 (young). 



Acipenser, nos. 3 & 4, Klein, Pise. Miss. iv. p. 13, tab. 1. 



Acipenser ruthenus, L. Syd. Nut. i. p. 403; Bl. Fisch. Dcufschl. iii. 

 p. 98, tab. 89; Bl. Schn. p. 347; Lacep. i. p. 435; Li-pechin, Rcise 

 Rass. Reich, i. p. 154, taf. 9. figs. 1&2; Brandt SfRntzehtirq,n.Y]}- 21, 

 353, taf. 2. fig. 2 ; Lovetzky, Nouv. Mem. Soc. Nut. Mosc. iii. p. 201, 

 tab. 18. fig. 2 ; Fitzinqer unci Hechel, Ann. Wien. Mas. i. p. 279, 

 tab. 2('). fig. 5, tab. 30. figs. 15 & 16; Brandt, Bull. Ac. Sc. St. I'ctersh. 

 X. 1851, p. 13, witb a plate (albino) ; Hcckel ^ Kner, p. 337 ; Siehold, 

 Siisstcasserjische, p. 3()0. 



sterleta, Giildcnstadt, Nov. Comm. Petrop. xvi. p. 633. 



Kostora, Gmel. Reise Russ. Reich, iii. pp. 238, 239. 



Acipenser pygnijieus. Pall. Zoor/r. Ross.-As. iii. p. 102, tab. IG. 



kamensis, Lovetzky, I. c. p. 202, tab. 1(). fig. 2, 



? Acipenser rutbeno aifinis, Pall. I. c. p. 107. 



? Acipenser aleutensis, Fitz. lS* Ileckel, I. c. p. 285. 



Acipenser gmelini, Fitz. S,- Heck. I. c. p. 276, tab. 25. fig. 2, tab. 30. 

 figs. 17 & 18 ; Heck. <\ Kner, p. 340. 



Anatomy: Kiilrcidcr, Nor. Comm. Petrop. xvi. p. 611, tab. 14. figs. 

 1-6, xvii. p. 521, tab. 10. figs. 1-11 ; Brandt S,- Ratzehiiry, I. c. ; 

 Agasdz, Poiss. Foss. ii. 2. p. 277, tab. E (skeleton); Molin, Sitzgsher. 

 Ak. Wiss. Wien, 1851, p. 357 (skeleton). 



Snout pointed, narrow, more or less produced, sometimes more, 

 sometimes less than half as long as the head ; barbels slightly 

 fringed. Dorsal shields moderately developed, 11-14 ; lateral shields 

 small, 60-70. Skin densely covered with minute denticulated ossi- 

 fications of equal size. 



Black Sea, Sea of Azow, Caspian Sea, with their rivers ; rivers of 

 Asiatic Russia ; probably north-western coasts of America. 

 «. Stuffed, 21 inches long. Russia. 



b. Several examples, 12 inches long. Wolga, 



c. Twelve inches long. Danube. Presented by Prof. v. Siebold. 

 (I. Young. Purchased. 



Var. gmelini. 

 e. Twelve inches long. Wolga. Purchased of Ilr. Ptrandt. 



In the example mentioned last, the snout is so short as to be 

 ecpial in length to the postorbital part of the head only, whilst it is 

 fully three-fifths of the length of the head in some oi the other ex- 

 amples. Others are intermediate between these extreme forms, not 

 leaving any doubt as to A. gmdini being a merely nominal species. 



2. Acipenser glaber. 



Huso II., or Antaceus glaber, Marsil. Dannb. Pannon. Mi/s. iv. 



tab. 10. 

 Acipenser glaber, Fitzinpcr, Prodr. Faun. Ocstcn: p. 340; Fitz. ^V 



Heck. Ann. If'ien. jyiii's. i. p. 270, tab. 25. fig. 3, tab. 28. figs. 5 & (> ; 



Heck. tV Kner, Sii.istcasserf. p. .■•32: Siebold, Siixswas.serf. p. ^350. 



