Zool.-Vol. I.] STARKS—SEBASTOLOBUS. 365 



and one and a half to the hypocoracoid {hype). About 

 three of the upper rays of the pectoral articulate directly 

 with the edge of the hypercoracoid. 



The postclavicle {pel.) is in two parts. The superior part 

 is thin and laminate, the inferior ray-like. 



The post-temporal {pot.) is widely forked. Through its 

 base is a longitudinal sensory canal continuous with a simi- 

 lar one through a dermal bone between it and the skull. 

 It bears a backward-projecting spine posteriorly. 



IV. — Vertebral Column. 



Plate XXIII, Fig. 9; Plate XXIV, Fig. 13. 



Vertebral formula, 1 1 + 1 7 -+- Hypural= 29. 



The neural spine of the atlas is not coossified with the 

 centrum. Its forks, where they meet the centrum, approach 

 each other around the lower side of the neural canal and fit 

 into slight sockets. 



The first two neural spines point more nearly forward 

 than do the rest, leaving a space between them and the third 

 into which the first two interneurals fit. 



The first two ribs articulate with the base of the neural 

 spines of the first two vertebra;. The succeeding ones ar- 

 ticulate gradually lower down, directly with the vertebrae, 

 without the intervention of transverse processes, until at the 

 sixth vertebra there is the first small transverse process at 

 its lower side. 



The first two ribs do not bear epipleurals {epp.) ; only 

 the succeeding four have them. The remaining epipleurals 

 join the large transverse processes with the ribs. 



The transverse processes, except the first or rudimentary 

 pair, point straight down. The opposing processes are 

 ankylosed for nearly their whole length. There is a haemal 

 arch left at their bases similar to that of the haemal spines 

 and their points are separate. 



The hypural {h.) is assisted in bearing the caudal fin by 

 the haemal spine of the preceding vertebra, by four or five 



