180 PEOF. P. MARTIN DUNCAUf's REVISIOIir OF THE 



Columella absent or rudimentary. Septa hardly exsert, those 

 of the last cycle less developed than those of the penultimate. 

 Costse fine, close, frequently discontinuous and vermiculate. 

 G-emmation irregular, and from the base. 

 Distribution. — Fossil. Eocene : England. 



Pourtales considered his Amplielia rostrata to belong to this 

 genus ; but it can hardly be included. 



Lindstrom has described, with his usual care, a remarkable 

 coral, which he considers to be one of the Eupsammidae, from the 

 Silurian strata of Gothland. The description and figures carry 

 conviction that this genus, Calostylis, is one of the Perforata, and 

 that it should be placed in the Eupsammidse. The resemblance 

 of the thick mural structure of the calices to that of Theco- 

 psammia, Pourtales, is very striking. 



Genus Calostylis, Lindstrom, (Efversigt af K. Vetensk.-Akad. 

 Mrhandl. p. 421 (1868). 



Colony cylindro-conical, uniserial, budding between the calice 

 and the base. Septa numerous, thin, coalescing, irregularly per- 

 forated, ragged at the upper free edge, and forming a trabeculate 

 columella with their inner ends. Columella broad, convex. Dis- 

 sepiments few. Costse extend from the calice to the base, and 

 are covered here and there by a smooth thin epitheca. 



Distrihution. — Fossil. Silurian : Grothland. 



The above diagnosis is compiled from Lindstrom's generic 

 diagnosis, and from the description of the species, Calostylis 

 crihraria, Lindstrom's diagnosis is rather too short for the 

 purjDOses of comparison with other Eupsammidse : — " Polyparium 

 compositum, gemmatio uniserialis, lateralis, septa numerosissima, 

 interdum inter se coalescentia, columella trabecularis, epitheca 

 incompleta." 



IV. Alliance LEPTOPSAMMIOIDA. 

 Simple Eupsammidse with irregular septal development. 



Genus Leptopsammia, Ed. & H. 

 Genus Endopsammia, Ed. & H. 



There are two genera, each established for one species only, 

 which are exceedingly unsatisfactory. They are Leptopsammia 

 and Flndopsammia of Milne-Edwards and Jules Haime. They 

 are closely allied, and in both there is an imperfection of the 



