Notes on some South American Fishes. 631 



7^. Eye 4| in head. Spinous dorsal with two rows of spots on its basal third. 

 Soft dorsal with about four series of much smaller spots. Sides plain. 



One specimen, 190 mm. Para (1782). 



Plagioscion surinameiisis (Bleeker). 



Agreeing well with Dr. Steindachner's figure (Fische des Mag- 

 dalenen Stromes, plate I). First pectoral ray prolonged in a fila- 

 ment. Preopercle with a spine at its angle. Two specimens, 135 

 and 187 mm. Para (1773 and 1784). 



Plagioscion sqiiamosissimus (Heckel). 



This species difi'ers from the preceding in having a much weaker 

 second anal spine. The filaments of the pectoral are but rarely 

 developed. 



Eighteen specimens. Para; Marajo; Itaituba. 



SciaBiia adusta Agassiz. 



D. X, I, 26^ (25^ in one specimen); A. II, 6|. Scales 51. Maxillary ex- 

 tending to front of pupil, its length 3 — 3^ in head. Head subconic, snout 

 blunt, projecting beyond premaxillaries, without slits or pores, 3^ — 3| in head. 

 Eye large, oval, orbit 3 in head. Mouth small, inferior, horizontal. Teetli 

 equal. About ten spines on the vertical part of the preopercle, increasing in 

 size from above to the angle. Smaller spines on the horizontal limb. Pre- 

 orbital convex, narrower than eye. Gill-rakers about twice as high as wide. 

 Caudal lanceolate, the middle rays prolonged, about as long as head. Spinous 

 dorsal dusky. Sides and remaining fins plain. 



Ten specimens. Lower Amazonas ; Carapi, Brazil. 



These specimens may not be specifically identical with those 

 described by Jordan (Report TJ. S. Fish Comm., 1886, 398 and 

 403). The specimens examined approach S. adusta, as described by 

 Agassiz, much more nearly than the specimens described by Jordan, 

 which have but 22 or 23 rays in the dorsal. 



The dorsal rays of this species have been given as follows : — 



Agassiz's figure ..... 19 



Jordan's specimens 22 — 23 



Cornell specimens 25 — 26 



Agassiz's description . . . .28 



Gerres Olistbostoma Goode & Bean. One specimen. Braret. 

 ChaetodipterilS falier (Brouss.). One specimen. Rio Janeiro. 



Teuthis tractus (Poey). One specimen. St. Thomas, W. I. 

 E)leotrls pisonis (Gmelin). One specimen. Lower Amazonas. 



