SCOMBfUD^. 
463 
which attains a length of about 0’2. Length of cranium equalling 
twice its maximum width ; fossae on cranial roof for lateral muscles 
n °t extending forwards beyond hinder border of orbit ; maximum 
depth of mandible less than one third its length ; superficial rugosity 
°n cranial roof and dentary comparatively coarse. Teeth well 
spaced, not very variable in size. 
Form. <$(■ Loc. Lower Eocene (London Clay) : London Basin. 
4145. Fine head, considerably larger than the type specimen ; 
Sheppey. Enniskillen Coll. 
I 1 - 4144. Abraded large head, labelled by Agassiz ; Sheppey. 
Enniskillen Coll. 
28758. Head, wanting occipital region ; Sheppey. 
Purchased , 1853. 
1/56. Imperfect rostrum of smaller skull ; Sheppey. 
Egerton Coll. 
37759. Cranium ; Sheppey. Saull Coll. 
3 8920, 38943. Two imperfect crania : Sheppey. Bowerbank Coll. 
166. Cranium, broken across middle ; Sheppey. 
Purchased , 1880. 
28 713, 28759. Three imperfect occipital halves of cranium; 
Sheppey, Purchased, 18o3« 
43107 . Similar specimen ; Sheppey. Wether ell Coll. 
!*• 9480. Similar specimen ; Sheppey. Enniskillen Coll. 
1757. Two more imperfect crania; Sheppey. Egerton Coll. 
7382. Fragmentary hinder portion of cranium, derived from 
London Clay ; lied Crag, Waldringfield, Suffolk. 
Prestwick Coll. 
8985. Similar specimen ; Coralline Crag, Sutton, Suffolk. 
Presented by Lady Prestwieh, 1896. 
Genus AUXIS, Cuvier. 
[Regne Animal, ed. 2, vol. ii. 1829, p. 199.] 
Trunk elongate-fusiform ; the slender caudal pedicle with strong 
m edian lateral keel. Teeth minute and conical on margin of jaws, 
n °ne on palatines, rare on vomer ; gill-rakers long, slender, and 
numerous. Vertebrae 30 to 40 in total number ; the centra much 
