264 Annals of the Carnegie Museum. 



5635 a. C. M. 195 mm., and 5636 a-e, five, 147-186 mm. Santarem, 



Dec, 1909. Haseman. 



Head 2.6-3, measured to end of long opercle and end of scales; 

 depth 1.8, D. 16 or 17, A. 25 to 27; scales 20 to 23-77 to 80-20 or 21. 

 Abdominal serrse 45-50; eye I in snout, 4-4.5 in head, 2-3 in interor- 

 bital; naked portion of cheek 1-1.33 in the width of the second sub- 

 orbital; greatest width of opercle 2-2.33 in its height. 



Body compressed, subrhomboidal, the head very wide; profile 

 depressed over the eyes, predorsal line naked; abdominal serrse all 

 simple; frontal fontanel ovate, shorter, but wider, than parietal; 

 occipital process extending about one-fourth to the dorsal, bordered 

 by about ten scales; skull with various ridges; mouth moderate, 

 mandible equals snout and half the eye; maxillary slender, concealed 

 when the mouth is closed; opercle with strong radiating ridges, 

 bordered by a very broad membrane; second suborbital narrow. 



Gill-rakers fine, similar on both arches, almost half as long as the 

 eye, about 36 -\- 40. 



Origin of dorsal equidistant from end of scales at base of middle 

 caudal rays and anterior part of ej'e; anterior dorsal rays equal 

 length of head without opercle; distal portion of adipose fin rayed; 

 depth of caudal peduncle equals the length of the opercle or less; 

 caudal broad, its margin lunate when expanded, naked portion of the 

 lobe nearly equal to the length of the head; origin of anal about 

 equidistant from snout with the base of the last dorsal ray, highest 

 rays equal to length of the head less half or the whole of the opercle; 

 ventrals lanceolate, sometimes reaching nearly to origin of anal; 

 pectorals extending a little beyond origin of ventrals. 



Scales moderate, largest just beneath origin of dorsal, minute on 

 adipose; caudal naked. 



Fins steel blue. Middle of sides in the smallest with numerous 

 round spots the size of the pupil or smaller; these become obscure 

 with the development of surface pigment with age. Region below 

 the lateral line smutty in adults, especially between the line and anal. 



Depth of anterior air-bladder equals the length of the posterior, 

 which is small, conical, as long as eye and half the snout; anterior 

 bladder equal about to head less opercle. 



Vertebrae 8 -|- 22 (counting those with haemal canal and not counting 

 the coalesced vertebrae) ; dorsal inserted on the sixth. 



