38 
SEIACHn. 
P. 2962, P. 2962 a. Twenty-five isolated teeth, one being nearly 
perfect and detached from the matrix ; Armagh, Ireland. 
The tablet bears the original label, “ Howse says this is 
allied to the genus Jemassa.” Ennishillen Coll. 
P. 2962 b. Broad tooth, like 4G036, showing delicate rug® or 
folds at the base of the crown ; Armagh. Ennislcillen Coll. 
P.1462. Four similar teeth, named Chomatodus truncatus” in 
Agassiz’s handwriting ; Armagh. Efjerton Coll. 
46036. Almost perfect tooth detached from matrix, showing no 
folds at the base of the crown, figured in PI. I. fig. 3; 
Beith, Ayrshire. Presented hy Robert Craig, Esq., 1874. 
49624-6,49651. Four teeth, either of this or an allied species; 
Eichmond, Yorkshire. Purchased, 1878. 
Jauassa imbricata (McCoy). 
1848. Climaxodus imbricatus, F. McCoy, Ann. & Mag. Nat. Hist. [2] 
vol. ii. p. 129. 
1855. Climaxodus imbricatus, F. McCoy, Brit. Pal®oz. Foss. p. C20, 
pi. .3 o. fig. 6. 
1870. Janassa imbricata, A. Hancock and T. Atthey, Nat. Hist. Trans. 
Northumb. & Durham, vol. iii. p. 338. 
Type. Imperfect tooth. 
Scarcely defined. The teeth are very similar to those of J. cla- 
vata, but differ in the prominence of the folds at the base of the 
crown. The original fragmentary tooth was misunderstood by 
McCoy, and the upper extremity described as the posterior, the 
hinder face of the crown as the grinding-surface. 
Form. Loc. Upper Carboniferous Limestone : Derbyshire. 
P. 5339. Two teeth figured, nat. size, in PL I. figs. 1, 2. The larger 
specimen differs from the type in the same manner as the 
median teeth of J. lingucrforviis differ from those placed 
laterally in that species ; its crown is much worn, appa- 
rently during the life of the animal. TicknaU, near 
Melbourne, South Derbyshire. Wilson Coll. 
The following species have been recorded from the Permian of 
North America, the type specimens being detached teeth : — 
.Tanassa strigilina, E. D. Cope, Amer. Nat. 1881 , p. 163, and Trans. 
Amer. Phil. Soe. vol. xvi. (1887), p. 285 : Strigilina lin- 
gmrformis, E. D. Cope, Proc. Amor. Phil. Soc. vol. xvii. 
(1878), p. 52. — Eastern Illinois. 
