56 Zoological Society. 



ventralium nigris ; lateribus argenteo xrittatim gxittulatis ; pinna 

 caudali recta, apice late hyalino. 

 D. i4. A. iV, &c. 



Affinis, ut videtur, Chcet. virescenti, Cuv. & Val. DifFert colore 

 flavo ; pinnis verticalibus postice nigro tenuiter cinctis ; lateribus 

 obscure argenteo-guttulatis. 



CHiET. Zoster. Chcet. brunneo-niger ; zona lata media ventreque 



argenteis ; pinnd caudali recta albd: Jascia ocidari nulla. 

 D. if. A. ^. P. 17. C. 15. V.i. 



The remaining species exhibited types of the genera Heiiiochus, 

 Cuv.,; Zanclus, Cuv. & Val.; Holacanthus, Lacep. ; and Platax, 

 Cuv. : the Heniochus being the species recently described by 

 MM. Cuvier and Valenciennes as the Hen. monoceros. In this 

 individual the spine in front of each orbit is strong, almost equalling 

 the single spine which projects from the middle of the slope of the 

 head ; and the whole contour of the anterior part of the fish ap- 

 proaches very nearly to that of Taurichthys, Cuv. & Val. 



Mr. Gray exhibited several living specimens of the Rana Ru- 

 beta, L., the Natter-Jack of Pennant, a reptile intermediate in form 

 and habits among the British Amphibia between the Toad and the 

 Frog. He stated that this animal, the indigenous existence of 

 which has frequently been doubted, is found abundantly on Black- 

 heath, and on other commons in the neighbourhood of London. 



Mr. Gray also exhibited several specimens of the genns Rhyn- 

 chcea, Cuv., and pointed out from among them two distinct species, 

 which may be thus characterized : 



RHYNCHiEA Capensis, Sav. Rhynch. remigibus angustis,J'asciis 



latisjlavis sex notatis, infrh griseis, nigro-vermiculatiSfJlavoque 



Jasciatis ; secundariarum macula pogonii externi, fascidque po- 



gonii interni,Jlavis. 



Long, corporis 9f unc. : tarsi, 21§ lin. : digiti unguisque medii, 



20^ lin. 

 Rhynch^a picta. Rhynch. remigibus sublatis, externis Jlavo 

 late l-Jasciatis, infra griseo nigroque vermiculatis, inlerno obso- 

 lete Jlavo -fasciato : secundariarum apicibus, maculd ultimaJascicB- 

 formi pogonii externi,Jascidqiie pogonii iiiterni, albis. 

 Long, corporis 10| unc. : tarsi, 19^ lin. : digiti medii, 19 lin. 

 The wing-coverts of both species are spotted with yellow in the 

 young state ; and in the adult state are metallic olive with black 

 bands. 



Mr. Gray added that the three figures of birds of this genus which 

 were published by Buffbn, and which had of late years been re- 

 garded by M. Teraminck and by M. Cuvier as representing various 

 states of but one species, were none of them sufficiently correct in 

 the details to enable him to refer either of the present species to the 

 representations given in the 'Planches Enluminees;' but that the 

 figure of the Rhynchcea Ccpensis given by Savigny in the ' Oiseaux 

 d'Egypte' [tab. 14. fig. 2.J, furnished a faithful representation of 

 the first species exhibited by him. He had not, however, obtained 

 this bird from the Cape of Good Hope, his specimens being from 



India 



