198 
ACTIXOPIEETGII. 
aspect, and perhaps representing the left clavicle. The 
mandible is fractured, and the ar'ticulo-angular element a 
little displaced with respect to the dentaiy. Both these 
bones are smooth, marked only by a few grooves and 
ridges. On the dentary (d.) one groove extends directly 
backwards from the symphysis just below the oral border, 
widening on the upper hinder extension of the bone, 
which seems to reach the articular end of the mandible; 
while a band of about six similar grooves extends back¬ 
wards and a little downwards from a point near the 
symphysis to the short lower hinder extension of the bone. 
On' the articulo-angular {ag.} the grooves radiate from 
the postero-inferior angle, one set continuing the lower 
band on the dentary already mentioned. Some of the 
characteristic large teeth are preserved, and the outer 
border of the dentary is shown to bear a close regular 
series of small slender teeth. Behind the skull are 
remains of the right operculum bent inwards, this being 
ornamented with very delicate tubercles and radiating 
lines. Between the mandibular rami are observed traces 
of the hyoid apparatus and branchiostegal rays too im¬ 
perfect for description. Numerous vertebral centra, in 
various states of preservation, are clustered round the 
head. They are longer than deep, much constricted, and 
strengthened with delicate longitudinal ridges at the side. 
A triangular hypural bone is also preserved. 
Van Breda Coll. 
42977. Bight dentary exposed from the inner aspect, with eight 
teeth. Van Breda Coll. 
42978. Imperfect ectopterygoid. Van Breda Coll. 
42867, 42978 a. Two imperfect left palatines. Van Breda Colh 
42866, 42978 h, c. Six detached teeth. Van Breda Coll. 
Enchodus lemonnieri^ Bollo. 
1893. Enchodus lemonnieri, L. Dollo, Bull. Soe. Beige Geol. vol. vi., 
Proc.-Yerb. p. 185, figs. 2, 4. 
Type. Palatine and dentary ; Eoyal Museum of Yatural History, 
Brussels. 
A large species, known only by jaws, in which the large teeth 
are comparatively short and broad and much laterally compressed. 
Palatine bone produced forwards in advance of its large tooth. 
