128 Royal Society : — 



Edwards and Jules Haime, are amongst those incerta sedis. The 

 discovery of several new species of HeterophyUia 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 Battershyia, which he proves had no coenenchyma. The 

 species of both of the genera are described shortly, and the develop- 

 ment and reproduction of B. yemmans also. The genera are placed 

 amongst the Astreeidse. 



The genus PalceocycJus, M.-E. & J. H., supposed to be one of 

 the Fungidse, is proved to be a vesiculo-tubulate coral genus, and to 

 be one of the Cyathophyllidse. 



One Mesozoic family is therefore removed from the Palaeozoic coral - 

 fauna, and two geuei-a of a Mesozoic division are introduced. They 

 foreshadow the Thecosmilice of the Trias. 



" Contribution to the Anatomy of Hatteria {Rhyiichocephalus, 

 Owen)." By Albert GtJNTHER, 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 ecto pterygoid. 



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 verteljral column and the remainder of the sJceleton show the 

 following peculiarities : — ■ 



1 . Vertebrse amphiccelian ; caudal vertebrae 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 hsemapophyses 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 



