316 THE PROCEEDINGS OP THE LINNEAN SOCIETY 



the length of the fifth, and much farther from the second than 

 the distance between the second and third ; the dorsal spines very 

 strong, and more than half the length of the fins ; the fins them- 

 selves more broadly rounded at the apex, and slightly emarginate 

 behind ; the first dorsal fin commences a little in advance of the 

 vertical from the posterior root of the pectoral ; the anal fin 

 reaches almost to the caudal, in this particular alone, agreeing 

 with H. galeatus ; the antero-inferior caudal lobe large, and 

 obliquely truncate at right angles to the anterior edge of the 

 posterior lobe, which is small and narrowly incised at its 

 iunction with the other ; the pectoral fins very large and rounded 

 at the apex. The colour seems to have been brownish black 

 above, and brownish white beneath ; the scattered black spots on 

 the body and fins mentioned in the descriptions of the fish are 

 not traceable in my specimen. 



Heterodontus Quoyi. 



Gestracion Quoyi. Freminv. Mag. Zool. 1840, pi. 3 ; Gunth. 

 Cat. 8, p. 416. 



Cestracion pantJierinus. Valenc in Voy. Venus, Zool. p. 350, 

 pi. 10, fig. 2. 



Heterodontus Quoyi. Dum. Ichthyol. tome 1, p. 427 ; teeth pi. 

 3, figs. 16—17. 



The figure (pi. 26) is copied from the Mag. Zool. Only 

 one specimen of this species is known ; it is about 2 feet 

 long, and was taken at the Gallapagos Islands during the 

 voyage of the "Venus." The descriptions given by Dumeril 

 and Gunther, the only authorities attainable by me, are 

 short, and leave out much that it would be desirable to 

 know, such as the form of the caudal fin, &c. ; but sufficient is 

 given to shew that the species it most resembles is H. Phillipi, 

 and that it is quite distinct from that. According to those des- 

 criptions the head is proportionally smaller than in H. Phillipi 

 the snout less obtuse ; the first dorsal fin commences well behind 

 the extremity of the base of the pectorals, and has its posterior 

 extremity prolonged over to the vertical from the ventrals ; the 

 second dorsal more distant from the posterior border of the ven- 



