200 DESCRIPTION OF FISHES. 
lateral teeth. It is not quite half an inch thick in the centre. In young and 
smaller specimens of this tooth the gradual increase of the dental plates is also 
very constant. 
Myliobates contractus. (Tab. XI. fig. 17. Lower jaw.) 
The great antero-posterior, as compared with the transverse diameter of the 
dental plates, their uniformity, and the long narrow character of the first row of 
diamond-shaped lateral teeth, clearly distinguish this species. 
It is half an inch in thickness at the middle. 
A recent lower jaw of Myliobates is figured at Tab. XI. fig. 1, from the College 
of Surgeons, which well shows the resemblance of the recent to the fossil species. 
Professor Agassiz considered this a new and unpublished species. 
Genus Attobates. 
Good specimens of this genus are of rarer occurrence at Bracklesham than 
those of Myliobates. Single dental plates are often met with ; they are picked 
up in the same situations and under the same circumstances as those of Mylio- 
bates. 
AXtobates wrreguluris. (Tab. X. figs. 6, 7,8; Tab. XII. figs. 2, 3, 4.) 
The specimens figured in this work belong to the lower jaw ; those figured by 
M. Agassiz in his magnificent work are portions of the upper jaw of the same 
species. Mr. Bowerbank has a fine lower jaw of this species, with ten dental 
plates, and I have one with nine plates. 
Fig. 2 of Tab. XI. has the enamel beautifully preserved ; it was found by Robert 
Drewitt, Esq., on a visit to Bracklesham with myself and Mr. Coombe. 
Fig. 4 is a much-worn specimen, not a quarter of an inch in thickness ; it 
nearly resembles ditt. subarcuatus of Agassiz. 
Atobates conveaus. (Tab. XI. fig. 5.) 
This species is readily recognised by the great convexity and tapering extre- 
mities of the dental plates, which come almost to a point on each side. 
Aitobates subconvexus. (Tab. XI. fig. 6.) 
The dental plates of this species are more regular and not quite so convex as 
