41 



The two genera above mentioned have recently l)een .studied 

 by Berg ('04). 



The following analytical table will serve to exhibit the re- 

 lations of the three genera here recognized, the characters of 

 the Asiatic genus being derived by us from the papers of Berg, 

 Kikolsky, and Kessler. 



A. Caudal peduncle shortened and laterally compressed as in 

 Ac I pc user, the rows of scutes not meeting above and be- 

 low to form a complete armor; mouth as m A(ipeni<ei\ 

 the lips two-lobed* and without clusters of papilla; ; gill- 

 rakers lance-shaped as in Acipcnser; air-bladder small or 

 rudimentaryf ; ribs numerous.^ 



F^ettiloscrqili irlnjiich lis Nikolsk}'. 



.4.4. Caudal peduncle lengthened, depressed, l)roader than 

 deep, and completely armored ; lips four-lobed, each lip 

 liearing four clusters of flattened tubercle-like lappets ; 

 gill-rakers fan-shaped, two-, three-, four-, or five-pointed 

 on the lower half of the arch. 

 //. Kibs twenty or twenty-one ; gill-rakers two- or three- 

 pointed ; belly and breast naked ; air-bladder S in 

 length of head and body. 



Piini.scdp/iir/ii/jiclnis. gen. nov. 



hh. Ribs ten or eleven ; gill-rakers two-, three-, four-, or five- 

 pointed : belly and lireast wholly covered with suln-hom- 

 bic plates ; air-bladder 5 in length of head and body. 



Snip/iirlii/iir/nis Heckel. 



Issued May 15, 1905. 



*See Berg, Zoul. Anz., X.W'II., 22, IQ04, p. 667; also Kessler's fiugres 

 of P. kaiitmanni and heniianni, Aralu Caspian Exped., I\'., 1877, Fig. 

 25 and 26. 



tOne twenty-seventh of length of head and body in P. fi-dtscliciikoin 



JTwenty-four or twenty-five in P. Jciitsiheiiko 



