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Description of a new Fossil Fish. 369 
outline and relative position are distinctly shown in figure 1; so, 
also, are the radiating lines of ossification. They present no ap- 
pearance of tuberculation, unless the slight elevations which form 
the centres from which these radiations proceed, can be so con- 
sidered. 
The anterior plate is oval-lanceolate, and was evidently prolong- 
ed intoa snout, not unlike that of some species of Chondropterygii. 
From the central lateral scutcheon plates project two marked 
prominences, which seem to have been the articulating surfaces 
of two spinous lateral appendages, perhaps somewhat similar to 
those of the Pterichthys cornutus, described by Hugh Miller.* 
What renders this supposition still more probable, is, the quarry- 
man affirms, that before it was mutilated, it had “two great horns” 
projecting from that part of its head. 
‘The scutcheons were evidently covered with angular, irregu- 
larly rhomboidal, and highly enamelled, but minute scales, for 
many of them are well preserved, especially on the left posterior 
scutcheon. With a magnifying glass the enamel of some of them 
appears to be even translucent. 
No eyes are distinguishable on the part from which the draw- 
ing was taken; but, on the mould from which the specimen was 
removed, and which we fortunately discovered during a recent 
visit to the locality, a smooth, convex surface can be seen on both 
sides, anterior to the position of the spinous appendages, which 
may, possibly, be remains of eyes; but the structure is not suffi- 
ciently distinct to enable one to form a decided opinion. 
The end view of the posterior portion of the fossil exhibits in 
the median line, three tenths of an inch beneath the upper convex 
surface of the body, a beautifully distinct condyloid articulating 
surface, composed of two ovoid, smooth prominences, separated 
by aslight groove ; where, probably, was attached either the pos- 
terior portion of the body or the tail. 
The under surface is irregularly concave, presenting a polished 
aspect towards the anterior and central part where the fossil is 
uninjured, and is partially incrusted with a thin, dark, smooth, glos- 
_. sy, lamellar substance, but without any radiations or sutures indi- 
cative of plates. 
ge - The lateral posterior parts are rough and irregular, presenting 
ly the fracture of the rock. But, situated between these 
* « New Walks in an Old Field.” 
