DTASTOPORA. 457 



bi'ancliing stems rise from the same base, forming very 

 beautiful clusters. 



The Mediterranean E. prohoscidea, M. -Edwards, is a 

 larger species, of more slender habit, and wanting the 

 clavate expansions, but very nearly akin to the present. 

 It has not occurred in our seas, the specimens which John- 

 ston referred to it being really Palmicellaria elegans of 

 Alder. (See page 378.) 



Habitat. On shell, &e., shallow to deep water. 



Localities. Wolf Rock, near Penzance (C. W. P.) : 

 under Berry Head, Torbay (T. H.) : coast of Antrim, off 

 the Maiden Lighthouses, 62-72 fathoms (Swanston). 



Range in Time. Coralline Crag (S. Wood). 



Genus DIASTOPORA (part.), Lamouroux. 



Der. From 5taffr>/jua, an interval, and Tropos, a passage or opening. 



Berenicea, Lamoui'oux : D"Orbigny (for one section of the genus). 



DiAsTOPORA (part.), Lamx. : Smitt. 



DiASTOPORA, Johnston : Busk : &c. 



TuBULiPORA (sp.), Johnston : &c. 



Patinella (sp.). Busk: Hincks. 



Mesenteripoka, Blainville : Busk: &c'. (iov foliaceous bilaminate forms). 



Discosparsa, D'Orbigny. 



Generic Character. — Zoarium adnate and crustaceous, 

 or foliaceous, usually discoid or jlabellate, less commonly 

 irrecjidar in form. Zoobcia tubular, with an elliptical 

 or subcircular orifice, croivded, longitudinally arranged, in 

 great part immersed. 



There seems to be no sufficient ground for detaching 

 this group from the present family. In its early state 

 Diastopora resembles Tubulipora ; and its peculiar habit 



