COCHLIODONTIDJS. 
223 
P. 4909 a. Small tooth, approaching the form described by J. W. 
Davis as Lophodus conicus 1 ; Yoredale Docks, Wensley- 
dale, Yorkshire. Horne Coll. 
\ . Small elongated teeth with one half of the crown broader and 
much more raised than the other, the elevation abruptly 
terminating about the middle of the tooth ; described as 
Chomatodus ( Helodus ) obliquus by M‘Coy 2 . 
P. 2826. Forty teeth ; Armagh. Enniskillen Coll. 
\ I. Small elongated teeth with a relatively large quadrangular 
coronal elevation, often slightly cleft by a small groove 
upon one side of its summit, described by M‘Coy as 
Helodus didymus 3 . 
P. 2833. Eighty specimens ; Armagh. Enniskillen Coll. 
P. 2805, P. 2339, P. 2840, P. 4927. Sixty specimens, mostly with 
the quadrangular elevation very broad ; Armagh. 
Enniskillen Coll. 
P. 1429. Two similar teeth ; Armagh. Egerton Coll. 
P. 1431-2. Twelve teeth, and three abraded teeth in natural 
sequence; Armagh. Egerton Coll. 
28748, 28749, 38507. Seventeen specimens ; Armagh. 
Purchased , 1853, 1864. 
48040. Small tooth, with elevation more pointed ; Beith, Ayrshire. 
Presented by Robert Craig, Esq., 1874. 
48041. Much depressed tooth, with broad elevation ; Beith. 
Presented by Robert Craig, Esq., 1874. 
P. 1430. Typical tooth ; Monmouthshire. Egerton Coll. 
P. 218. Tooth ; Oreton, Shropshire. Weaver-Jones Coll. 
P. 2857. Three imperfect teeth ; Oreton. Enniskillen Coil. 
1 Quart. Journ.Geol. Soc. vol. xl. (1884), p. 627, pi. xxvi. fig. 18. 
2 Ann. Mag. Nat. Hist. [2] vol. ii. (1848), p. 124; Brit. Palmoz. Foss. (1855), 
p. 618, pi. 3 k. fig. 3. 
3 Brit. Pakeoz. Foss. (1855), p. 630, pi. 3i. figs. 18-20. LojJodus didymus , 
H. Romanowsly, Bull. Soc. Imp. Nat. Moscou, 1864, pt. ii. p. 162, pi. iv. 
fig. 23 ; also J. W. Davis, Trans. Eoy. Dublin Soc. [2] vol. i. (1883), p. 407, 
pi. Ii. fig. 21. 
