164 GILBERT 



replaced by smaller ones continuing the series. The maxillary teeth 

 are more uniform in size and about equal the smallest of those in the 

 lower jaw. Along front and sides of jaw the teeth are slightly in- 

 cur\'ed and are directed downward and backward ; laterally they be- 

 come decidedly retrorse, pointing downward and forward. 



The anal begins under the middle of the dorsal. The origin of the 

 dorsal is midway between the base of the caudal fin and the middle of 

 the eye. The fins are somewhat mutilated and the scales have fallen. 

 There seems to have been a wide silvery band along the sides, on a 

 level with the eye. 



18. Poecilia vivipara Bloch and Schneider. 



Four specimens from a fresh-water swamp, and from the man- 

 groves, near Pernambuco. 



D. 6, 7 or 8 ; A. 7 or 8. L. L. 27. Basal half of dorsal dusky, 

 with a narrow black convex cross-bar separating basal region from 

 the distal area; the latter with a wide dusky mai-gin. In the largest 

 specimen the coloration of the side is nearly uniform, without spots. 

 Smaller specimens show a black spot on each side of back, in advance 

 of the origin of the dorsal fin. In the youngest specimens these spots 

 are very conspicuous. 



19. Hyporhamphus roberti (Cuvier& Valenciennes). 



One specimen, 160 mm. long, from Pernambuco, seems to belong 

 here rather than with H. unifasciatus^ as the body is very slender 

 (depth 9 in length) and the beak is very long, its length beyond the 

 premaxillaries being half longer than the distance from tip of upper 

 jaw to opercular margin. Dorsal with 15 rays; anal with 16. 



20. Hyporhamphus unifasciatus (Ranzani). 

 Maceio. 



21. Mugil curema Cuvier & Valenciennes. 

 Maceio. 



22. Mugil trichodon Poey. 

 Stone reef at Mamanguape. 



23. Sphyraena barracuda (Walbaum). 

 Maceio. 



24. Polydactylus virginicus (Linmuus). 

 Pernambuco ; Ivlaceiu. 



25. Myripristis jacobus Cuvier & Valenciennes. 

 One specimen from a coral reef near Maceio. 



