366 
• ACTIXOriERYGIT. 
Megalurus damoni, Egerton. 
1858. Megalurus damoni , Sir P. Egerton, Figs. & Descript. Brit. 
Organic Remains, dec. ix. (Mem. Geol. Surv.), no. 8, pi. viii. 
wW 1873. Megalurus damoni, V. Thiolliere, Poiss. Foss. Bugey, pt. ii. 
L, p. 22 pi. ix. /9t n/erf >5/'s 
7 T ?/y>c. Imperfect fishes ; British Museum. 
A species attaining a length of about 03. Head with opercular 
apparatus occupying about one-fifth of the total length of the fish, 
and the depth of the caudal pedicle contained scarcely five times in 
the length from the hinder border of the operculum to the base of 
the middle caudal fin-rays. External bones slightly rugose, other¬ 
wise not ornamented. Vertebrae not exceeding 50 in number, each 
with an upper and lower deep lateral indent. Fins as in the type 
species. Scales apparently all much broader than deep. 
Form. 4' hoc. Purbeckian: Dorsetshire. Lower Iximmeridgian 
(Lithographic Stone): Ain, France. 
P. 563, P. 3660. The two type specimens ; Bincombe, near Wey¬ 
mouth. Enniskillen 4' Egerton Colls. 
41156. Fine specimen 0-195 in length; Isle of Portland. The 
caudal region is fractured and thus in part somewhat 
obscured, but there cannot have been many alternating 
hypocentra and pleurocentra. Purchased , 1868. 
P. 3661. Smaller, more imperfect fish apparently showing more 
numerous alternating hypocentra and pleurocentra in the 
caudal region ; near Weymouth. Enniskillen Coll. 
41171. Two halves of a large fish on the alternate halves of coun¬ 
terpart slabs; Isle of Portland. Purchased , 1868. 
Megalurus austeni, Egerton. 
1858. Megalurus austeni , Sir P. Egerton, Figs. & Descript. Brit. 
Organic Remains, dec. ix. (Mem. Geol. Surv.), no. 9, pi. ix. 
1858. Attakeopsis (?) austeni, V. Thiolliere, Bull. Soc, Geol. France, [2] 
vol. xv. p. 785. 
Type. Imperfect head and abdominal region ; British Museum. 
An imperfectly known and indefinable species closely resembling 
M. damoni , having similar vertebrae but apparently differing in the 
relatively much greater depth of the scales in the abdominal region. 
Form. 4' hoc. Purbeckian : Dorsetshire. 1 
1 The species is supposed by Thiolliere ( loc. cit.) to occur also in tlie Litho¬ 
graphic Stone ofCirin, France. 
