NO. 1366. 



OSTEOLOGY OF BERYCOID FISHES— STARKS. 



617 



opposite the posterior end of the soft dorsal. A lower row of inter- 

 musculars runs low along the posterior ribs and is coiitiiuied on the 

 hwmal spines nearly to opposite the posterior end of the anal. Spines 

 from the last two vertehne assist the hyplural in supporting the 

 caudal tin. The interspinous rays of the tins exceed in number the 

 spines. The tirst interbaemal is enlarged (doubtless formed of the 

 united first two or three interhiemals), and is tubular for the reception 

 of the posterior end of the air l)ladder. as in the genus Eucinostomus. 



MONOCENTRIS JAPONICUS (Houttuyn). 



CRANHM. 



The top of the cranium is full of deep cavities between high ridges 

 which form a complex pattern. The ridges are all \ery rough on 



Fig. 10. — MoNOCENTKis jAPOXicrs. 

 For lettering see fig. 6. 



their upper edges. On the frontals extending their whole median 

 length the ridges form a diamond. From the posterior point of the 

 diamond the supraoccipital ridge extends back. From the anterior 

 point a ridge runs forward on the nasals, diverging anteriorly. A 

 ridge on each nasal runs backward and outward from the ]X)int of 

 divergence of the median nasal ridge to the outer posterior angle of 

 the nasal. From the outer angle of the diamond on each side a pair 

 of ridges diverge backward; the up])er one runs over the frontal and 

 parietal, the lower one over the frontal and supratemporal. From 

 the middle of each anterior side of the diamond a ridge runs forward 

 and outward to the anterior outer angle of the frontal. A ridge 

 runs along the supraorbital rim across the sphenotic to the pterotic. 

 The supraorbital rises but slightly al)ove the rest of the cranium. 

 The exoccipitals and the basioccipital mutually assist in forming a 



