4DS 
ACTINOi TER YGIJ. 
Genus SPATHIURUS, Davis. 
[Trans. Roy. Dublin Soc. (2) vol. iii. 1887, p. 502.] 
Syn. Amphilaphurus, J. W. Davis, ibid. 1887, p. 504. 
Head large and trunk not much tapering in the caudal region; 
[jaws and teeth unknown]. Vertebral centra usually about as long 
as deep, and the side of each exhibiting a median longitudinal 
ridge with a deep pit above and below. Pin-rays robust, all closely 
articulated and divided at some distance from the base ; fulcra 
present on both median and paired fins. Paired fins large, the 
pelvics as deep as the anal; dorsal fin occupying the greater part of 
the back, and anal fin small, opposed to the hinder extremity of the 
latter; caudal fin slightly excavated at its hinder margin. Scales 
large. 
Spathiurus dorsalis, Davis. 
1887. Spathiunis dorsalis, J. W. Davis, Trans. Hoy. Dublin Soc. [2] 
vol. iii. p. 503, pi. xxxv. fig. 1. 
1887. Amphilaphurus major, J. W. Davis, ibid. vol. iii. p. 504, pi. xxiv. 
fig. 2. [Caudal region ; British Museum.] 
Type. Imperfect trunk; British Museum. 
The type species, attaining a length of. not less than 0'35, imper¬ 
fectly known. Caudal pedicle apparently more than half as deep 
as the abdominal region. Vertebrai somewhat deeper than long. 
Dorsal fin comprising about 45 rays, not extending quite to the 
caudal; anal fin with 10 rays, remote from the caudal and much 
nearer the pelvic fins. 
Form. Sf Loc. Upper Senonian: Mt. Lebanon. 
P.4867. Type specimen described and figured loc. cit .; Hakel. 
There is no evidence of the extension of the anal fin 
beyond 10 rays. Lewis Coll. 
P. 4746. Type specimen of the so-called Amphilaphurus major , 
described and figured loc. cit. ; Hakel. The two pelvic 
fins are crushed together, and apparently regarded as one 
by Davis ; the “ horse-shoe-shaped ” pelvic bone of his 
description is a misapprehension, the fragments preserved 
undoubtedly indicating a pair of normal pelvic bones 
expanded at each extremity. Lewis Coll. 
P. 5995-96. Two examples of the middle portion of the trunk ; 
Hakel. The first specimen shows especially stout neural 
