﻿254 SIRENOIDEI. 



36915. Much abraded palatine dental plate, resembling C. ovatus, 

 Barkas ; Dalkeith, near Edinburgh. Purchased, 1863. 



21423. Similar dental plate, more imperfect ; Carluke, Lanark- 

 shire. Purchased, 1847. 



21422. Slab with imperfect palatine dental plate, the partial 

 impression of another, and fragments of bone ; Carluke. 



Purchased, 1847. 



P. 6284. Plaster cast of palatine dental plate described and figured 

 in the Geol. Mag. vol. vi. p. 316, pi. ix. fig. 2 ; Low 

 Main Seam, Newsham, near Newcastle-upon-Tyne. 



P. 3382-3. Imperfect palatine dental plate, and a small example of 

 the mandibular dental plate associated with Sagenodus 

 incequalis ; Newsham. Ennislcillen Coll. 



41121. Mandibular dental plate detached from matrix, somewhat 

 crushed, and figured in the Geol. Mag. vol. vi. pi. ix. 

 fig. 3 (C. tuberculatus) ; Carluke. Bruson Coll. 



45854. Imperfect left mandibular dental plate, with bone ; News- 

 ham. Purchased, 1874. 



P. 774. Similar but larger specimen ; (?) Newsham. Egerton Coll. 



P. 5165. Mandibular dental plate ; Hanley, Staffordshire. 



Purchased, 1885. 



P. 5164. Portion of a larger dental plate ; Tunstall, Staffordshire. 



Purchased, 1885. 



Ctenodus interruptus, Barkas. 

 1869. Ctenodus interruptus, T. P. Barkas, Scientific Opinion, vol. ii. 



p. 113. 

 1890. Ctenodus interruptus, A. S.Woodward, Ann. Rep. Yorksh. Phil. 



Soc. 1889, p. 37, pi. i. fig. 2. 

 1890. Ctenodus interruptus, R. H. Traquair, Geol. Mag. [3] vol. vii. 



p. 249. 



Type. Mandibular dental plate ; York Museum. 



Dental plates closely resembling those of C. cristatus, very 

 variable in characters, with 12-14 ridges. Denticles very pro- 

 minent and well separated in the outer moiety of the ridges, each 

 much compressed in the direction of the ridge to which it pertains. 



Form. 4' Loc. Calciferous Sandstones : Fifeshire and Midlothian. 

 Carboniferous Limestone: Fifeshire, Midlothian, and Ayrshire. 



Not renresented in the Collection. 



