548 
ACTIN’ OUTERY GTI. 
is also a detached scale showing tuberculations near its 
ventral border. Enniskillen Coll. 
P. 5198-9. Two line specimens, the second measuring 0*11 in 
length ; Longton, North Staffordshire. Both these fossils 
exhibit the form of the head and trunk, and part ot the 
upper and lower dentition of the fish, besides the propor¬ 
tions of the pectoral and median fins. Purchased , 1885. 
P. 5190. Four imperfect fishes ; Longton. One is in counterpart, 
displayingthe operculum, suboperculum, and post-temporal, 
with other bones ; another exhibits well the scale-orna¬ 
ment ; while a third also shows several head and opercular 
bones, in addition to the maxillary dentition. 
Purchased , 1885. 
P. 5191. Very small imperfect fish, showing the dorsal peak; 
Longton. Purchased , 1885. 
36892. Somewhat larger imperfect trunk with parts of the caudal 
fin ; Longton. Purchased , 1862. 
21975. Two much crashed and broken examples of the caudal 
region, in counterpart, probably of this species : Carluke, 
Lanarkshire. The fin-rays do not exhibit the character¬ 
istic ornament—a circumstance that may be due to their 
splitting and showing the inner face. Purchased , 1848. 
P. 3500 a. Group of scales labelled by Agassiz: Carluke, Lanark¬ 
shire. Enniskillen Coll. 
Piatysomus tenuistriatus ? Traquair, 
1866. Piatysomus striatus, J. Young ( errore ), Quart. Journ. Geol. Soc. 
vol. xxii. p. 305. 
1879. Piatysomus tenuistriatus, R. H. Traquair, Trans. Roy. Soc. 
Edinb. vol. xxix. p. 369. 
Type. Eish ; Museum of Practical Geology. 
A small species attaining a length of about 009. Body rounded ; 
dorsal margin strongly and evenly arched from the occiput to the 
narrow caudal pedicle; ventral margin more gently curved from 
the branchial region to the origin of the anal fin, from which it 
then slopes rapidly upwards. Most of the head-bones finely striated, 
but those of the cranial roof also in part granulated; operculum 
very high and narrow, interoperculum very small. Dorsal fin 
nrising somewhat behind the highest point of the back, and anal 
