3.. MICROPOGON. 271 



anal with two, one of which is moderately strong. Scales moderate, 

 ctenoid. Pseudobranchia) ; the air-bladder with elongate horns. 

 Pyloric appendages in small number. 

 Atlantic coasts of the New World, enteiing fresh waters. Chile ? 



1. Micropogon undulatus. 



Catesby, Carol, ii. p. 3. tab. -3. f. 1. 



Perca undiilata, L. Si/st. Nat. p. 483 ; Bl. Schn. p. 87. 



Scijena croker, Lacep. iv. pp. 309, 314, 316. 



opercularis, Quoij ^ Gaim. Voy. JJran. Zool. p. 347. 



Micropogon imdidatus, Cuv. ^ Val. v. p. 219; Dekay, New York 



Fauna, Fishes, p. 84; Holbr. Ichth. S. Carol, p. 145. pi. 21. f. 1. 

 lineatus, Cuv. ^ Val, v. p. 215. pi. 119 ; ? Gay, Hist. Cliil. Zool, 



ii. p. 193. 

 argenteus, Cuv. 8f Val, v. p. 218. 



D. 10 1 -i-. A. -I- L. lat. 55. L. transv. ^,. Caic. pylor. 8-9. 

 Vert. 10/15. 



The upper jaw convex, overlapping the lower ; the upper max- 

 illary reaches a little behind the anterior margin of the eye ; pra3- 

 operculimi denticulated, vdih. two rather strong spinous teeth at the 

 angle. Caudalis truncated ; the second anal spine moderately strong, 

 one-third the length of the head. Dorsal fins greyish, with or 

 without spots ; a black spot above the axil ; body with more or less 

 oblique streaks. 



Atlantic coasts of the New World, entering fresh waters. 



The structure of the air-bladder is known : cfr. Cuv. 6f Val. v. 

 p. 216, and Siebold 6f Stunnius, Zoot. Fische, pp. 227, 228. 



a. Large specimen. Surinam. Purchased of Mr. Frank. 

 6. Adult. Bahia. Purchased of M. Parzudaki. 



c. Adult. Guatemala. Pui'chased of Mr. Frank. 



d. Adult. Cuba. From the Collection of the Zoological Society. 



e. f. Half-grown : skins. Jamaica. From Dr. Pamell's Collection. 

 g. Adult : skin. New York. From Dr. Pamell's Collection. 



h. Adidt. From the Haslar Collection. 



i. Adult : skeleton. From the Haslar Collection. 



k, I. Half-grown. Old Collection. 



m. Air-bladder of specimen i. 



Skeleton, — Two portions may be distinguished in the inaxiUary 

 bone : the basal portion with two articular cavities, as in Scicena 

 amazonica, and the external part of the bone, which, moderately 

 broad from its origin, is not very much widened at its opposite ex- 

 tremity ; there are no vestiges of its having been separated into two 

 bones. The intermaxillanj is strong, but narrow, and much shorter 

 than the maxillary ; it has a flat, short posterior prominence at its 

 extremity ; the posterior processes are exceedingly broad, twdce as 

 broad as the bone itself, and reach as far backwards as the turbinal 

 bones, which, thin and excavated, do not fully extend to the level of 

 the anterior margin of the orbit. The anterior part of the vomer is 



