400 Mr. A. S. Woodward on some 



stricted pedicle, and its great lobes are as slender as is usual 

 in Caturus ; the short mesial rays are more closely articulated 

 and expanded than those of the lobes. The squamation is 

 almost completely destroyed ; but there are distinct impres- 

 sions of the small rhombic exposed faces of the scales along 

 both the dorsal and ventral borders, and behind the anal fin 

 there is evidence of the deeply overlapping character of these 

 scales. A mass of whitish coprolitic matter in the abdo- 

 minal region seems to mark the position of the intestinal 

 tract. 



Though thus imperfectly known, the Portlandian fish from 

 Garsington is evidently specifically distinct from any Caturus 

 hitherto described. The proportions of the trunk and fins 

 above noted suffice to distinguisli it even from the elongated 

 species described by Agassiz and Wagner from the Bavarian 

 Lithographic Stone. The name of Caturus angustus^ proposed 

 by Agassiz, may therefore be retained. 



Type. Fish, wanting head ; Worcester Museum. 



Form, and Loc. Portlandian ; Garsington, Oxford. 



2. Gyrodus punctatusj Agassiz. 

 (PL XVIir. figs. 2-4.) 



1844. Gyrodus pwicfatus, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 231, 

 pi. bdx. a. fig. 24. 



Portions of the dentition of the Pycnodont genus Gyrodus 

 are scarcely capable of specific determination ; but it is 

 probable that when specimens from one formation and locality 

 exhibit only small differences from each other they are speci- 

 fically identical. For this reason we refer to Gyrodus punc- 

 tatus (a species founded on a vomerine dentition from the 

 Corallian of Malton) some examples both of the upper and 

 lower dentition of Gyrodus now in the Maltijn Museum. 

 When describing the original fossil, which is in the York 

 Museum, Agassiz remarked that it might perhaps be referable 

 to the same fish as tlie Kimmeridgian lower jaws named by 

 him 6r. Cuvieri; but if the Malton fossils now to be described 

 are correctly determined, it seems likely that Agassiz's 

 original nomenclature will eventually prove to be justifiable. 



The new fossils comprise a portion of the vomerine den- 

 tition (Hg. 2), the right and left splenials in association (that 

 ot left side shown in fig. 3), a large right splenial dentition 

 (fig. 4) , and some isolated teeth ; and the writer is indebted 

 to Mr. Samuel Chadwick, F.G.S., the well-known indefati- 

 gable explorer of the Yorkshire oolites, for the privilege of 

 studying the collection. Two of the specimens (figs. 2, 4) 



