128 Royal Society :— 
Edwards and Jules Haime, are amongst those incerte sedis. The 
discovery of several new species of Heterophyllia enables Dr. Duncan 
to determine the anatomy of the genus, to offer for consideration the 
most extraordinary coral form he has ever seen, and to ally the 
genus with Battersbyia, which he proves had no coenenchyma. The 
species of both of the genera are described shortly, and the develop- 
ment and reproduction of B. gemmans also. The genera are placed 
amongst the Astreidee. 
The genus Paleocyclus, M.-E. & J. H., supposed to be one of 
the Fungide, is proved to be a vesiculo-tubulate coral genus, and to 
be one of the Cyathophyllidee. 
One Mesozoic family is therefore removed from the Palzeozoic coral- 
fauna, and two genera of a Mesozoic division are introduced. They 
foreshadow the Thecosmilie of the Trias. 
‘Contribution to the Anatomy of Hatteria (Rhynchocephalus, 
Owen).” By Avsert Giyruer, M.A., Ph.D., M.D. | 
The skull of Hatteria is distinguished by the following charac- 
ters :— 
1. Persistence of the sutures, especially of those between the 
lateral halves of the skull, combined with great development of its 
ossified parts—a development which appears in the expanse of the 
bones forming the upper surface of the facial portion, in the com- 
pleteness of an orbital ring with a temporal and zygomatic bar 
(Crocodilia), in the much expanded columella, in the nearly com- 
pletely osseous bottom of the orbit, and roof of the palate. 
2. Sutural union of the tympanic with the skull; firm and solid 
union of the bones of the palate with the tympanic, as shown by the 
sutural connexion of tympanic and pterygoid, broad sutural con- 
nexion of the columella with tympanic and pterygoid, immoveable 
pterygo-sphenoid joint, firm and extensive attachment of pterygoid 
to ectopterygoid. 
3. This restriction of the mobility of the bones named is com- 
pensated by an increased and modified mobility of the lower jaw, 
the mandibles being united by ligament, and provided with a much 
elongated articular surface. 
4, Displacement of the palatine bones, which are separated by the 
pterygoids, and replace a palatal portion of the maxillaries. 
5. Perforation of the tympanic; extremely short postarticular 
process of the mandible. 
The vertebral column and the remainder of the skeleton show the 
following peculiarities :— . 
1. Vertebree amphiccelian ; caudal vertebree vertically divided into 
two equal halves. Points of minor importance are the uniform 
development of strong neural spines, and the direction of the caudal 
pleurapophyses, which point forwards. 
2. The costal heemapophyses are modified, first, into a series of 
appendages identical in position with the uncinate processes of 
birds; and, secondly, into a double terminal series connecting the 
