408 Mr. A. S. Woodward on 



witli Sardinius macrodactylus of AY. von der Marck ^ ; but 

 whether or not the latter is correctly placed in the same genus 

 as the typical Sardinius Cordieri is a question that admits of 

 further discussion. 



2. Clupea elongdia, J. W. Davis, loe. cit. p. 581, pi. xxxiii. 

 fig. 2. \_=-Thrissopteroides tenuic-p^, sp. n.] 



Tiie head in the type specimen of this species is so much 

 crushed and distorted that its characters can only be very 

 imperfectly observed. The mandibular articulation, however, 

 apjiears to be beneath the hinder margin of the orbit, and the 

 finely toothed border of both maxillje can be distinguished, 

 that of one side in almost complete impression, that of the 

 other side only partly exposed. The former is erroneously 

 described by Davis as a series of " minute orifices, where 

 numerous teeth have been attached." The axial skeleton of 

 the trunk is slender, the ribs being especially delicate, but 

 completely encircling the abdominal cavity. The vertebrtfi 

 are approximately 60 in number, and about 18 may be re- 

 garded as caudal. As shown by the original figure, the 

 pelvic fins are only about half as large as the pectoral pair 

 and arise considerably behind the middle point of the trunk. 

 The rather elevated dorsal fin, with about 12 or 14 rays, is 

 directly opposed to the space between the pelvic and anal 

 fins. The anal fin is comparatively low and delicate, with 

 about 15 rays. Tiie length of the head with opercular appa- 

 ratus is twice as great as the maximum depth of the trunk 

 and contained about three times in the length from the 

 pectoral arcli to the base of the caudal fin. There are no traces 

 of ridge-scales. 



As shown by the general characters of the skeleton, this 

 fish is closely related to Sj>aniodo?i, and a second specimen, 

 evidently of the same species, in the British Museum 

 (no. 49592) exhibits the characteristic enlarged tooth at the 

 anterior end of the dentary. The fine denticulation of the 

 maxilla, however, and the position of the dorsal fin remove 

 the fish from Spaniodon to the allied genus Thrissojyteroides'f, 

 in which it forms a new species requiring a name. The type 

 species of Thrissopteroides is termed T. elongutuSj so that it 

 is necessary to propose a new name for the species now 

 described, T. tenuiceps. 



3. Clupea pidchra, J. W. Davis, loc. cit. p. 578, pi. xxxiii. 

 fig. 3. [ = Thrissopteroides pulcher.^ 



This very small fish, evidently of the same genus as the 



* Palseontogr. vol. xi. (1863), p. 44, pi. vi. fig. 1. 



f W. von der Marck, Palaeontogi-aphica, vol. xsii. (1873), p. 61. 



