SEMIOXOTIDJE. 
149 
obtuse and slightly bifid. Scales of the abdominal and part of the 
caudal region all ornamented at least in their anterior half with 
coarse tuberculations, which are often flattened, closely arranged, 
and in part fused into rugae; hinder border conspicuously serrated 
in young specimens, smooth or nearly so in adults. 
The type specimen of the so-called D. cycloides was obtained 
from the “ Angulatus-kalk ” of Steinburg, near Zabern, Lower 
Alsace. 
Form. Sf Log. Lower Lias : Dorsetshire and Alsace-Lorraine. 
All the following specimens were obtained from the neighbour¬ 
hood of Lyme Regis, Dorsetshire :— 
P. 3581. Type specimen of the so-called Tetragonolepis pustulatus, 
described and figured by Agassiz, loc. cit. Remains of 
the head and anterior abdominal squamation are shown, 
but teeth are wanting. Enniskillen Coll. 
19004 a. Remains of the head and greater portion of the trunk of 
a large fish probably about 06 in length. From the 
Johnson Collection, noticed by Agassiz, op, cit. vol. ii. 
pt. i. p. 201. Purchased, 1845. 
40351. Large specimen, much elongated by distortion and dis¬ 
playing the caudal fin. Purchased , 1867. 
P. 5937. Fine specimen 0-55 in length, showing the obtuse, bifid 
marginal teeth. The scales are not serrated, and many 
of the tubercles on the flank are fused into short rugae. 
Purchased , 1889. 
P. 3563. Well-preserved fish about 0-475 in length. As in the 
former specimen, none of the scales exhibit serrations. 
Enniskillen Coll. 
P. 3564. An equally large imperfect fish displaying the dorsal and 
caudal fins. The tuberculations upon the cranial roof 
and flank-scales are partially fused into short rugae. 
Enniskillen Coll. 
P. 3564 a. Imperfect head and trunk wanting the dorsal region; 
the ornament consisting of rounded tubercles, rarely fused 
except on the ridge-scales. Enniskillen Coll. 
P. 3562. Imperfect and distorted remains of the head and abdominal 
region of an equally large fish. Enniskillen Coll. 
P. 3564 b. Fragmentary trunk with skull. 
P. 1577. Fine specimen 0*42 in length. 
Enniskillen Coll. 
Egerton Coll. 
