JJ3G ACIPENSERID.K. 



Acipeuser nudiveutris, Lovetzky, Nov. Ma<j. Jvdveim. ii. uo. 1, aud 

 Aouv. Mem. Soc. Nut. Mono. iii. p. 200, tab. 15. fig. 2. 



marsiglii, Brandt i\- liatzch. ii. p. 352. 



schipa, Lovetzkij, I. c. p. 2li0, tab. 17. tifrs. 3 & 4 (young). 



Suout rather short, rounded ; both halves of the lower lip con- 

 tiguous ; barbels slightly fringed. Dorsal shields well developed, 

 12-16 ; lateral shields small, luimerous, GO. Skin densely covered 

 with small denticulated ossitications. D. 43. 



Black Sea and Sea of Azow, with their rivers. 



3. Acipenser brandtii. 



Acipeuser schypa, Brandt ^- liatzeb. ii. p. 350, tab. la. tig. 2, F-K 

 (not p. 20, tab. 1. Hg. 3). 



Snout rather pointed, the barbels, which are simple, being uearer 

 to the mouth tlian to the extremity of the snout ; the halves of the 

 lower lip separated by an interspace. Dorsal shields rather small, 

 13 ; lateral shields smaU, 4'J-51. The upper part of the snout with 

 small, not contiguous, shields. Skin with numerous very small den- 

 ticidated ossifications. {B. 4' ii) 



Black and Caspian Seas, with their rivers. 



Golowatschof believes that this is a hybrid between A. huso and 

 A. schypa (Bull. Soc. Nat. Mosc. 1857, ii. p. o41 ). 



4. Acipeuser transmontanus. 

 Acipeuser trausmontanus, Richards. Faun. Bor.-Amer. iii. p. 278, 

 pi. 97. 

 Snout osseous above, pointed, of moderate length, much shorter 

 than the remaining part of the head. Barbels not flattened, much 

 nearer to the end of the snout than to the mouth. The lialves of 

 the lower lip separated by a wide interspace. The parietal and 

 temporal plates subequal in size. Dorsal sliields 12-14, lateral 

 42-47, small. Skin studded with small, scattered, stellated tu- 

 bercles of various forms and sizes. The greater pai-t of tlie anal 

 below the dorsal. D. 45-52. 

 Columbia River ; California. 

 a-h. Seventeen and thirteoi inches long. California. From the 

 Godeffroy Museum. 



5. Acipenser naccarii. 



Acipenser huso, Naccari, lit. Adr. p. 23 ; Nardu, Prodr. Adr. Ichth. 



sp. 36. 

 naccarii, Bonap. Faun. Bal. Besc. c. fig. ; Ileckel, Sitzgsher. Ak. 



Wiss. Wien, vii. 1851, p. 555, taf. 24. fig. 1 ; IlechI ^- Knvr,8uss- 



umsserjische, p. 353. 

 nardoi, HccM, I. c. p. 557, fig. 2 ; Heckel ^- Kmr, I. c. p. 365. 



Snout o,sseou8 abo\e, rather obtuse, of moderate length, its length 

 boing more than one-third of the length of the head. Barbels not 

 flattened, simple, ratlier long, nearer to the extremity of the snout 



