ADUEXDA. 517 



Pago 218. Balistes mitis. Add to the synonym)^ : — 

 Biilistes capistratiis, Laccp. ed. Pillut, Paris, 1831, vi. p. 120 (not Tiles.) 



Pago 223. Balistes flavimargiiiatiis. Add to the synonymy : — 

 Balistes brasilieusis, BI. 'Schn. p. 470 (tide Peters). 



Page 2-")(!. Ostracioii trigonus. 

 (/. Young. Bahia. J'nrc-hased of Mr. Cutter. 



Page 207. Tetrodon hispidus. 

 a'. Young. Suez. Presented by R. MacAndrew, Esq. 



Page 320. POLYPTERUS. 



Dr. Stcindachner (Sitzgsber. Ak. Wiss. Wien, 1869, Ix. June 10) 

 has made the very interesting observation that certain young indivi- 

 duals from the Senegal, 7-0 inches long, are provided with a long 

 external gill. The examples have 14 or 15 dorsal spines, and are 

 regarded as the tj'pe of a distinct s])ecies, P. lapradei, which is 

 figured. HoAvever, the other characters do not appear to me to be 

 of sufficient value to distinguish this form specificalljr ; and as I have 

 seen many young Poli/pteri, down even to 5 inches in length, without 

 a trace of external gills, I am inclined to regard the occurrence of 

 these organs in some individuals, as another instance of a casual, 

 but not normal dimorphism in one and the same species. 



Page 326. Polypterus bichir. 



/3'. Seventeen dorsal finlets. 



a. Adult: stuffed. Egypt. Purchased of M. Parzudaki. 



h' . Fourteen dorsal finlets. 



g . Adult : stuffed. Interior of West Africa. From Landers Ex- 

 pedition. 



Page 333. ACIPENSER. 



Prof. Brandt (Bull. Ac. Sc. St. Petersb. 1869, p. 171) has arrived 

 at the same conclusion as myself with regard to the distinction of 

 species. He rejects most of the species established by Heckel, and 

 regards those recently named by Aug. Dumeril as inadmissible. 

 The synonymy indicated by him differs from that given in this work 

 in the following points : — 



Page 336. Acipenser nudiventris (Lovetzky) is distinguished from 

 A. glaher. 



Page 336. Acipenser hrandtii is said to be a hybrid between A. 

 huso and A. glaher. 



Page 337. Acipenser nanus is identical with A. nacearii. 



Page 341. Acipenser heckelii is identical with A. naccarii. 



Finally he gives preliminary diagnoses of two new species (Aci- 

 penser schrenckii and A. hcfrii) ; but as he has omitted to give the 

 number of the lateral scutes, I am unable to introduce them into the 

 system. 



