70 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



new species; but I am unable to find the long premaxillary teeth said to 

 exist in the typical species of Spaniodon. As the absence of these 

 may be due to accident, and as all other characters coincide, I leave it 

 under this genus. From the known genera of Saurodontidce of the same 

 horizon, the edentulous maxillary bone, combined with long dentaries 

 with round section, and the absence of pectoral and ventral spines, sep- 

 arate it. To the characters named, I may add that there are no dermal 

 scuta, but cycloid dorsal scales. Whether the body was scaly below the 

 lateral line is not clear from our specimens. 



There are numerous slender branchiostegal rays. The pectoral fins 

 are inferior; the dorsal is not large, is composed of soft rays, and is sub- 

 median in position. The ventral fins originate behind it, and the anal 

 fin still more posteriorly, leaving a long abdominal cavity. The ribs are 

 long, and the superior ribs numerous. The femora are elongate, and 

 are narrowed and converging anteriorly. They do not appear to be 

 fissured. The dorsal centra are not elongate, and are grooved. 



Character specijicus. — Three specimens, more or less mutilated, repre- 

 sent this fish; one of these is almost entire, and serves as the type of 

 my description. 



The gape of the mouth is wide, and is directed forward and upward. 

 The extremity of the muzzle is the premaxillary bone, and this is 

 concave backward, so as to give, with the oblique mouth, a bulldog ex- 

 pression. The superior profile is gently concave. The opercular appa- 

 ratus is produced slightly downward and backward, so that the poste- 

 rior depth of the head equals its length. The partly opened moutb 

 displays two long, straight, acute teeth on the anterior extremity of the 

 dentary bone. The pectoral fins are large, while the ventrals are small. 

 The anal is moderate, and has a concave border. Eadii : D. II. 20 ; A. 

 11. 14; Y. 8; P. 14. Vertebrse': D. 32; C. 13. Anterior dorsals not 

 different from the others. 



Measurements. 



M. 



Total length 0.160 



Length to opercular border (axial) 0.047 



Length to dorsal fin (axial) 0. 072 



Length to ventral fin (axial) 0. 100 



Length to anal fin (axial) 0. 117 



Length to caudal fin (axial) 0. 1.35 



Depth of head posteriorly 0.033 



D^pth of body at dorsal fin 0.035 



Depth of body at first anal ray 0.020 



Depth of caudal peduncle 0. 012 



This genus is one of the Isospondyli. 



Sardinius nasutulus, sp. nov. 



This species is referred to a genus established by von der Marck for 

 three species of Isospondylous, and probably Clupeoid fishes, which have 

 been found in the Upper Cretaceous of Westphalia. They present 

 mostly negative characters, resembling Clupew, without abdominal nor 



