DESCRIPTION OF FISHES. 199 
sists in the regularity of the diamond-shaped accessory plates, which in the 
recent fish are generally unequal. The specimen I have figured differs from the 
one bearing this specific name in Professor Agassiz’s superb work, in having the 
surface of the teeth uniformly punctated, instead of striated or irregularly 
plicated, but in all other respects it is similar. I have one specimen from the 
Park-bed, allied to this species, with three rows of lateral teeth, the greatest 
number I have ever seen preserved. 
The specimen figured, Tab. X. fig. 3, is from the lower jaw ; and fig. 4 repre- 
sents the under surface, showing the strong furrows so peculiar to the dental 
plates of this family. This mode of attachment is wonderfully adapted for giving 
strength to the teeth, whilst the substance to which they are attached favours 
the removal of the old and worn-away dental plates, which are succeeded by new 
ones from behind. 
Myliobates irregularis. (Tab. XI. fig. 15.) 
Of this species I am enabled to figure the most magnificent lower jaw that has 
as yet been discovered ; the great irregularity of the dental plates, their shortness 
compared to their breadth, their solidity and depth, which in the centre of the 
specimen is one inch, are characters quite sufficient to determine it to be a new 
species. The black glossy character of the specimen is well shown by Mr. L. 
Aldous in the engraving. From the Cabinet of G. A. Coombe, Esq. 
Myliobates striatus. (Tab. XII. fig. 2.) 
The dental plates of this species are finely striated on the surface, and of 
considerable size. The original specimen named by Agassiz was from the Very 
Rev. Dr. Buckland’s collection, and was found at Sheppey. The specimen en- 
graved is from the lower jaw, and is half an inch thick in the centre. 
Myliobates Edwardsi. (Tab. XI. fig. 16. Lower jaw.) 
This specimen I found in one of my visits to Bracklesham with my friend 
Fred. Edwards, Esq., and have named it after him ; it was considered a new species 
by Agassiz. In some of its characters it resembles M. toliapicus, but the gradual 
increase of the length or antero-posterior diameter of the dental plates from the 
back to the front or worn-down extremity of the series is very remarkable, 
combined with the elongated character of the second row of diamond-shaped 
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