Geological Society of London. 137 
scales in each, the author showed that one species must be referred 
to the genus Semionotus, and was most nearly allied to the American 
types referred by Sir P. Egerton to Ischypterus. For this species 
the name of Semionotus capensis was proposed. 
The other species agreed in its characters with the Platysomide, 
and was especially allied to the genus Tetragonolepis ; but the nearest 
ally of all was a fish from the Hawkesbury Beds of Australia, 
Clithrolepis granulatus. The name of Clithrolepis Extoni was proposed 
for the new South African species. 
IJ.—February 8, 1888.—Prof. J. W. Judd, F.R.S., President, in 
the Chair.—The following communications were read :— 
1. “On some Remains of Squatina Cranei, sp. nov., and the 
Mandible of Belonostomus cinctus, from the Chalk of Sussex, preserved 
in the Collection of Henry Willett, Esq., F.G.S., Brighton Museum.” 
By A. Smith Woodward, Esq., F.G.S. 
The remains referable to Squatina consist of a crushed skull, with 
the mandibular and hyoid arches, and an associated fragment of the 
pectoral fin with dermal tubercles. The fish was probably about 
30 inches long. There are some difficulties in the way of interpre- 
tation, but the form and relative proportions of the cranium, etc., 
appear to be similar to those of the living representative of the genus. 
The dentition is not completely preserved; the teeth near the 
symphysis of the mandible are relatively high and slender, while 
the opposing teeth are small. The great relative size of the 
spinous dermal tubercles serves to distinguish it from species of 
Squatina already known. The anterior lower teeth are also more 
slender than in the existing S. angelus. 
No specimen of Belonostomus has hitherto revealed the precise 
characters of the dentition or the relations of the hindermost bones. 
This deficiency is now supplied. The two rami occupy only one 
half the entire length of the jaw, the anterior half being formed by 
the elongated presymphysial bone, which is provided with a powerful 
prehensile dentition. The character of the teeth was described by 
the author: the large median teeth end abruptly at the posterior 
extremity of the presymphysial element, but the small lateral teeth 
are continued backwards upon the rami of the jaw, increasing in 
size and becoming relatively shorter. Further details were given, 
and the evidence shows that the original specimens described by 
Agassiz, as portions of the mandibular rami of Belonostomus cinctus, 
are really fragments of the presymphysial bone of this species. Some 
of the relations of Belonostomus and Aspidorhynchus were pointed out. 
2. “On the History and Characters of the Genus Septastrea, 
D’Orbigny (1849), and the Identity of its Type Species with that of 
Glyphastrea, Duncan (1887).” By George Jennings Hinde, Ph.D., 
¥.G.S. 
D’Orbigny founded the genus Septastreea on the characters of a 
coral from the Miocene strata of Virginia, which was named S. sub- 
ramosa, but no specific description was given. In the same year 
(1849), Edwards & Haime accepted the genus as valid, but placed 
