150 



J. W. Davis — Carboniferous Fish-remains. 



Glasgow. The specimens from Derbyshire present as great a variety 

 in form as those from Armagh so far as the series extend, and there 

 can be little doubt that the species is the same. In one or two of 

 the best-preserved examples, the depth of the tooth only exceeds the 

 breadth by one-fifth, and consequently is probably from the posterior 

 part of the mouth ; the sigmoidally curved folds of the ganoine, 

 extending across the external surface at the base of the crown, are 

 only three in number. In the species found at Armagh there are 

 four or five imbricating folds. The beak -like cutting-edge of the 

 crown is somewhat deeply and broadly serrated along each lateral 

 margin in some of the specimens ; in this it also diverges from the 

 types and offers a superficial resemblance to the teeth of the genus 

 Ctenopetalus. Minute vertical furrows extend from the cutting 

 margin downwards over the anterior surface of the crown. 



Palatal Teeth of Fishes from the Carboniferous Limestone, Chapel-en-le-Frith, 

 Derbyshire. Coll. Thos. Parker, Esq. 



Family Cochliodontid^:, E. Owen. 



Streblodus oblongns, Agass. MS. 



Davis, Trans. Roy. Dublin Soc. n.s. vol. i. p. 424, pi. liii. figs. 1-4 (1883). 



Eemains of the teeth of this species are not uncommon. They 

 are usually detached, and owing to their extreme brittleness, and the 



