558 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [June 25, 



It is represented by several specimens from St. Bartholomew's, in 

 the West Indies, in Mr. P. T. CWe's collection. 



Family EUNGID^E. 



Subfamily LoPHOSEEiNiE, Edw. & Haime. 



Genus Tttrblnosebjs, Duncan, Palseontological Society's Memoirs, 

 vol. xxiii. ; Cretaceous Corals, pt. ii. p. 42. 



The characters originally given for this genus are as follows : — 



The corallum is simple, more or less turbinate, or constricted mid- 

 way between the base and calice. The base is either broad and ad- 

 herent, or small and free. 



There is no epitheca ; and the costse are distinct. There is no 

 columella ; and the septa, which are very numerous, unite laterally. 



The genus is allied to Trochoseris, Edw. & H. ; but this group has a 

 columella, a structure which is not found in Turbinoseris. 



The only species hitherto described is from the Atherfield Clay of 

 the Lower Green Sand ; but the genus is well represented in the St.- 

 Bartholomew's deposits by species, varieties, and many individuals. 



I now amend the generic diagnosis as follows : — 



Turbinoseris, Duncan. 



The corallum is simple and turbinate, or conical. The base is 

 either broad, with a mark of former adherence, or narrow and free. 

 The epitheca is rudimentary, but frequently is distinct. Synapticulge 

 usually present between the costse and septa also. Septa and costse 

 numerous. 



The genus may be subdivided into two groups : — with species which 

 have the costse close together and united by numerous synapticulse ; 

 and a second, the species of which have no synapticulse between the 

 costse, which are wide apart. 



1. Tttebestoseris eooentca, spec. nov. PL XXI. fig. 12. 



The corallum is tall and greatly compressed. At the base there is 

 a sharp peduncle, from which the sides pass rather abruptly outwards 

 and upwards at first, and then they diverge but slightly to the 

 calice. The shape is that of a narrow and compressed cone. 



The calice is elliptical in outline ; and its margins are either 

 horizontal or slightly arched in the direction of its long axis. It is 

 shallow ; and there is no columella. In its long axis there is a linear 

 space, which is bounded by the enlarged ends of the larger septa. 



The septa are very numerous, crowded, unequal ; and the smaller 

 frequently join the larger by their sides. 



There are five complete cycles of septa in six systems ; and there are 

 a few laminae of the sixth cycle. The larger septa reach and form the 

 horizontal floor of the calice ; and their ends are swollen, and bound 

 the axial space. Numerous and delicate synapticula? join the septa. 



The costse are delicate, subequal, very numerous, close, wavy oc- 

 casionally, and are connected by numerous well-developed synapti- 

 culae, which are placed very closely. 



The costal and septal numbers were attained very early in the 

 life of the coral. 



