424 Bulletin American Museum of Natural History. [Vol. XIX, 



The species which are satisfactorily determined as belong- 

 ing to the genus are the following: Osmeroides monasteri 

 Agassiz, 0. crassicaudus (Marck), O. megapterus Pictet, O. 

 pusilhis (A. S. Woodward), 0. woodwardi, nom. nov. (= Sar- 

 dinioides attenuatus A. S. Woodward), 0. macro phthalmus 

 (Marck), and the two new species below described, 0. ponti- 

 vagus and 0. ornatus. 



Three other species of doubtful value, according to Dr. A. 

 S. Woodward, have been described by von der Marck, O. 

 macropterygius , 0. minutus, and 0. tenuicaudus. 



Osmeroides pontivagus, sp. nov. 

 Plate XXXIII, Figures 1-4. 



This species is represented by at least 15 individuals. The 

 size is small, and the fish is closely related to 0. pusillus, 

 which has been described as Sardinioides pusillus by Dr. A. S. 

 Woodward from Sahel Alma (Cat. Foss. Fishes, IV, p. 240, 

 pi. xvi, figs. 2, 3). 0. pontivagus differs from the latter in 

 several important respects. Dr. Woodward states that in 0. 

 pusillus the serrations of the scales are deep and conspicuous. 

 In 0. pontivagus, on the contrary, they are very obscure, and 

 it is only in favorable situations on the matrix, and with the aid 

 of a good lens, that they can be seen at all. There are also 

 more rays in the dorsal fin than there are in the species from 

 Sahel Alma, 12 or 13, instead of 10 or 11. There are quite 

 certainly 9 rays in the anal fin. The ventrals are inserted 

 somewhat behind the origin of the dorsal fin, and they show 

 the presence of 7 rays. Several specimens present at least 13 

 rays in the pectoral. 



The mouth of this species is large, the articulation of the 

 lower jaw being placed well behind the orbit. No. 45246 

 {3846) has the mouth widely opened and shows the slender 

 and toothed premaxilla as forming the whole of the upper 

 border of the mouth (PI. xxxiii, Fig. i). There is a patch of 

 teeth on the palatopterygoid arch. The maxilla is expanded 

 at the distal end. There were probably 8 branchiostegal rays 

 on each side. There are about 30 vertebrae, not more. 



