ADDENDA. 517 



Page 218. Balistes mitis. Add to the synonjTny : — 

 Balistea capistratus, Lacep. ed. nUot, Paris, 1831, vi. p. 126 (not TUes.) 



Page 223. Balistes flavimar^atus. Add to the synonymy :— 

 Balistes brasiliensis, Bl Sclin. p. 470 (fide Peters). 



Page 25fi. Ostracion trigonus. 

 g. Young. Bahia. Piirchased of Mr. Cutter. 



Page 297. Tetrodon hispidus. 

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



Page 32G. POLYPTERUS. 



Dr. Steindachner (Sitzgsber. Ak. Wiss. Wien, 1869, Ix. Juno 10) 

 has made the very interesting observation that certain young indivi- 

 duals from the Senegal, 7-9 inches long, are provided with a long 

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

 regarded as the type of a distinct species, P. lapradei, which is 

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

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

 seen many young Pohjpteri, down even to 5 inches in length, -without 

 a trace of external giRs, 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 Jinlcts. 

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

 c . Fourteen dorsal finlets. 



g'. Adult : stuffed. Interior of West Africa. From Lander's 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. Dume'ril as inadmissible. 

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

 in the following points : — 



Page 336. Acipetiser nudiventris (Lovetzky) is distinguished from 

 A. glaber. 



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

 huso and A. glaber. 



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



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



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

 penser schrenchii and A. hirrii) ; but as he has omitted to give the 

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

 system. 



