552 PROCEEDINGS OE 1HE GEOLOGICAL SOCIETY. [June 25, 



Family ASTKJEIMl. 

 Division Trochosmiliaceve, Edw. & H. (1857). 



1. Trochosmilia shcctxrvata, Reuss. PI. XIX. fig. 1. 



A variety of this species is present in the St. -Bartholomew 

 limestone ; and it has a very great resemblance to the type which 

 came from Oberburg, in Styria, and was described by Eeuss in 

 1864*. 



Var. nov. PI. XIX. fig. la. 



The corallum is subturbinate, and rather sharply conical inferiorly : 

 its curve is slight. 



* The calice is widely open ; and the septa are thin, long, and 

 crowded. There are five cycles of septa, the fifth being complete in 

 some of the six systems. 



The costse are subequal above, not very prominent, and faintly 

 granular. Accretion-ridges are seen. 



Loc. Island of St. Bartholomew. 



Collection of Mr. P. T. Cleve, Stockholm. 



2. Trochosmilia insignis, sp. nov. PI. XIX. fig. 2. 



The corallum is tall, cylindrical above, and curved inferior^ 7 . 

 Superiorly it is slightly compressed, and inferiorly decidedly so, close 

 to the broad scar of the former adhesion. 



Transverse sections near the calicular termination exhibit nearly 

 circular outlines. 



The wall is thin; the costse are subequal, distinct, sharp, not 

 crowded, and they enlarge where the exotheca comes in contact with 

 them. Near the calice rudimentary costse exist. 



The septa are thinner than the costse, and are wavy. There are 

 six systems, and five cycles in each system, the fifth being occasion- 

 ally incomplete. Septa are attached to the rudimentary costse. All 

 the septa are connected by oblique dissepiments ; and a false colu- 

 mella is occasionally produced by the junction of the septal ends 

 by endotheca. 



The exotheca is abundant. 



Height of corallum l-jL inch. Breadth of section ^ inch. 



Loc. St. Bartholomew's Island, West Indies. 



Collection of Mr. P. T. Cleve, Stockholm. 



Var. with equal costse. 



3. Trochosmilia argtjta, Reuss. PI. XIX. fig. 3. 



Some specimens from the limestone of St. Bartholomew, and in 

 the collection of the University of Upsala, so closely resemble this 

 species f from the Castel-Gomberto Oligocene that I am disposed to 

 consider them geographical varieties. 



Var. with a few more costse than the type. 



* Eeuss, Denkschr. .Akad. Wiss. "Wien, niatk.-nat. CI Band xxiii. 1864, p. 

 13, and Band xxviii. 1868, p. 140. 



f Eeuss, Denkschr. Akad. Wiss. Wien, math.-nat. CI. Band xxviii. p. 140. 



