1. ACIPENSF.R. 335 



1. Acipenser ruthenus. 



Storlet. 



Marsil. Danuh. Prnmon. Mys. iv. p. 35, tab. 11. fig. 2 (adult), and 

 fig. 1 (young). 



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



Aoipenser ruthenus, L. Syst. Nat. i. p, 403; Bl. Fisch. Dentschl. iii. 

 p. 98, tab. 89 ; Bl. Schn. p. 347 ; Lac6p. i. p. 435 ; Lepechiii, Reisc 

 Russ. Reich, i. p. 154, taf. 9. figs. 1 &2; Brandt ^Ratzebtiry,\.\.'^^. 21, 

 353, taf. 2. fig. 2 : Lonetzky, Nouv. Mem. Soc. Nat. Mosc. iii. p. 201, 

 tab. 18. fig. 2 ; Fitzingcr und Hcckel, Ann. Wien. Mus. i. p. 279, 

 tab. 2(3. fig. 5, tab. 30. figs. 15 & 16; Brandt, Bull. Ac. Sc. St. IWersb. 

 X. 1851, p. 13, with a plate (albino) ; Hcckel Sr Kner, p. 337 ; Siebold, 

 Siisstcassojische, p. 3(50. 



stcrleta, Giddmstddt, Nov. Comm. Petrop. xvi. p. 533. 



Kostera, Gmcl. Rcise Russ. Reich, iii. pp. 238, 239. 



Acipenser pygmoeus. Pall. Zooyr. Ross.-As. iii. p. 102, tab. 10. 



kamensis, Lovctzky, I. c. p. 202, tab. 10. fig. 2. 



? Acipenser rutlieno affinis, Pall. I. c. p. 107. 



? Acipenser aleutonsis, Fitz. iS- Hcckel, I. c. p. 285. 



Acipenser gnielini, F^tz. S,- Heck. I. c. p. 276, tab. 25. fig. 2, tab. 30. 

 figs. 17 & 18 ; Heck. ^ Kner, p. 340. 



Anatomy: Kolrcutcr, Nov. Comm. Petrop. xvi. p. 511, tab. 14. figs. 

 1-6, xvii. p. 521, tab. 10. figs. 1-11 ; Brandt 4" Ratzehury, I. c. ; 

 Ayassiz, Poiss. Foss. ii. 2. p. 277, tab. E (skeleton) ; Molin, Sitzysher. 

 Ak. Wiss. Wien, 1851, p. 857 (skeleton). 



Snout pointed, narrow, moic 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. 



o. Stuffed, 21 inches long. Russia. 



b. Several examples, 12 inches long. Wolga. 



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



d. Young. Purchased. 



Var. gmelini. 



e. Twelve inches loug. Wolga. Purchased of Hr. Brandt. 



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

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

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

 amples. Others are intermediate between these extreme forms, not 

 leaving any doubt as to ^ . gmelini being a merely nominal species. 



2. Acipenser glaber. 



Iluso II., or Antaceus glaber, Marsil. Damtb. Pannon. Mi/s. iv. 

 tab. 10. 



Acipenser glaber, Fitzinyer, Prudr. Faun. Oestcrr. p. 340; Fifz. tV 

 Heck. Ann. Wien. Mus. i. p. 270, tab. 25. fig. 3, tab. 28. figs. 5 k (5 : 

 Heck. 8f Kner, Siissumsserf. p. 3.32; Siebold, Siis-swasserf. p. 359. 



