'SaO SCOMBRID.E. 



\p. Half-grown. From the Haslar Collection. 



w. Half- grown. From the Haslar Collection. 



aa. Half-gro^^'n. Presented by Lord Orkney. 



bb-ff. Half-grown and young. 



gg-ii. Half-grown and young. 



Iclc. Half-grown. Purchased of Mr. Stevens. 



II. Half-grown. Presented by Mrs. Mauger. 



mm. Half-grown. Presented by the Royal College of Surgeons. 



nn. Half-grown. 



00, pp. Half-grown. 



qq. Young. From the Collection of the Zoological Society. 



rr. Young. 



ss. Young. 



tt, uu. Young. 



vv-iv.v. Young. 



yy. Young. 



zz. Young. Presented by the Royal College of Surgeons. 



Skele 'on. — The structure of the skeleton is distinguished by several 

 peculiarities. The upper part of the skull is very broad, flat, exca- 

 vated for the reception of the adhesive disk. The occipital is rounded, 

 without any crest ; the parietals are very small, and united with 

 the principal frontal bones ; the latter are provided with a low, de- 

 pressed, longitudinal crest, and extend nearly to the anterior extre- 

 mity of the snout ; the ethmoid is large, free, ovate, and situated 

 between the anterior part of the frontals. The praefrontals are 

 rather small, forming the anterior portion of the roof of the orbit ; 

 there is a roundish opening between the prsefrontal and the principal 

 frontal. The maxillary is much more slender than the intermax- 

 illary, and placed immediately before and below the turbinal bones ; 

 the latter are singularly elongate, and form the outer margin of the 

 snout : both are far remote from each other, converging anteriorly. 

 The vomer is exceedingly broad, with a shallow impression along its 

 middle. The dentary and articulary portions of the mandibula are 

 loosely joined together — the former extending far backwards, the 

 latter reaching nearly to the anterior extremity of the jaw ; the an- 

 gular portion is small ; the muciferous channel is rudimentarj'. 

 The praiorbital is triangular and very solid, the remainder of the 

 infraorbital ring slender. 



The prajoperculum is small, and has the margin rounded, and a 

 very prominent and strong ridge along its inferior portion. The 

 operculum is rhombic, small, with two strong, not veiy prominent 

 ridges, radiating from its upper angle. The suboperciilum is crescent- 

 shaped, bent upwards behind the operculum ; the interoperculum is 

 small. The suprascapula is broad, forming a part of the upper sur- 

 face of the skull ; it is joined to the ridge of the frontal bone by a 

 slender horizontal process: the scapula is small and short. The 

 humeral is composed of two lamcUa), forming together a deep groove: 

 the coracoid appears to be absent. The pubic bones are broad, each 

 formed by a single bony plate, which is convex inferiorly, and pro- 



