CRETACEOUS FISHES. 369 
intestines. Southeram pit near Lewes and those near Amberley often produce good 
examples of this fish. It is certainly one of the finest fishes of the chalk formation. 
Family PycNopontTID&. 
Genus Pycnodus', Agassiz. 
Pycnodus parallelus, new, R. 4. (Tab. XXXIIL. fig. 3.) 
This fine specimen, from Mr. Catt’s cabinet, has some resemblance to Pycnodus 
gigas of Agassiz, but the teeth are more elongated, and a distinct marginal ridge 
surrounds their base. The peculiar character of this species is the parallel 
arrangement of the teeth, which in other species is more or less oblique. The 
engraving is a good representation of the fossil. 
Genus Microdon?, Agassiz. 
This genus very much resembles Pycnodus ; the body is flat and nearly circular, 
the profile of the head almost vertical; the eye is placed high in the head, and 
the space between it and the mouth very considerable ; the jaws are slightly pro- 
minent, and in the lower one there are four rows of teeth of uniform size ; the fins 
are the same as in Pycnodus. The dentition forms a most essential character of 
the genus. The teeth are smaller than in Pycnodus, and more elongated. 
Microdon nuchalis, new, R. 4. (Tab. XXXII. fig. 7.) 
This small fish was found in a pit belonging to Sir Harry Goring, Bart., at 
Washington ; it is on the opposite side of the road to the one I have mentioned 
as Washington chalk-pit. I have also procured from it a star-fish and other 
scarce fossils. The specimen shows little more than the head, but the form of 
the occipital region sufficiently distinguishes it from its nearest ally Microdon 
radiatus, from the Purbeck beds; this portion of the cranium is prolonged into 
a somewhat triangular crest, sloping backwards in the direction of the nape, 
whence its specific name. 
Microdon occipitalis, R. 4. (Tab. XXXII*. fig. 2.) 
Mr. Catt has a larger specimen of this genus, found at Lewes, which differs 
materially from the preceding species, not only in size, but in the larger di- 
' zuxvos ereber, ddous dens. > wixpos parvus, ddovs dens. 
