362 ZOOPHYTES. 



These species with twisted lamellae constitute, in part, the genus 

 Strombodes, as this name is used by Phillips and Lonsdale. The 

 name is from the Greek xXitfiov, a tent, and alludes to the A -like figures 

 which are made by the converging lamella? about the centre, as seen 

 in a vertical section. 



Plate 26, figure 6, section of a simple turbinate species ; figures 7, 

 7 a, section of a cell in a massive species ; 7 a, represents the central 

 portion of fig. 7, enlarged. 



GEJIUS IX. MICHELINIA. KONINCK. 



Cyathophyllidce aggregate. Corallum cellis excavatis ; septis olliquis 

 irregularibus, e lateribus productis et sursum convergentibus, axe 

 nullo. 



Aggregate Cyathophyllida?. Corallum with excavate cells; the whole 

 interior with oblique irregular septa, converging towards an axial 

 line ; axis none. 



This genus was instituted by Koninck. The species have the inter- 

 nal texture of the Clisiophylla, except that there is no regularly cel- 

 lular structure exterior to the central convergent portion. They differ 

 from the Sarcinulse in having no axis. In the Michelinia tenuisepta, 

 (Calamopora tenuisepta, of Phillips) the general structure of the coral- 

 lum is columnar. 



Phillips, Geol. of Yorkshire, ii. 201, pi. 2, C. figs. 3a,b; Michelin, Icon. Zooph., 

 fig. 30 ; Koninck, Desc. des Anim. foss. 83, pi. 16, fig. 3. 

 des terrains houilkrs de Belgique, 31, pi. 



GENUS X. COLUMNARIA. GOLDFUSS. 



Cyathophyllidce segregate, glomerate, polypis contiguis, itaque pris- 

 maticis. Corallum cellis radiatis, medio interno septis cellutisque 

 sursum obliquis, axeque, composite ; texturd laterum celluhsa. 



