CYCLOSTOMATA 



263 



ORDER I 



same plane, slightly compressed, and divided into two equal parts by a wavy mesial 

 lamina. Silurian. 



? Clausa, d'Orb. (Claviclausa, (?) Sparsicavea, d'Orb.) Like Entalophora, but having 

 the zocecial apertures surrounded by shallow interstitial cells, the mouths of which are. 

 covered in the perfect condition. Cretaceous. 



? Petalophora, Lonsd. (Cavea, d'Orb. ; Canalipora, Hagw.) Cretaceous. 



Family 5. Fasciporidae. d'Orbigny (emend.) 



Zocecia tubular, opening in dusters at the groiving extremities, and in linear or quin- 

 cuncial series on the sides of the lamelliform, 

 or obconical zoaria. Accessory pores wanting. 

 Cretaceous. 



Fascipora, d'Orb. (Fasciporina, d'Orb.) Zoaria 

 compressed, sub-ramose to lamelliform. Aper- 

 tures arranged quincuncially or somewhat 

 irregularly on both sides, and on the more 

 or less expanded growing extremities of the 

 branches and lamellae. The lamelliform species 

 resemble Diastopora, but are without a mesial 

 lamina. 



Semifascipora, d'Orb. (Fig. 420). Zoaria cup- 

 or funnel-shaped, with only the outer surface 

 poriferous, the inner covered by an epitheca. 

 Poriferous face thrown into vertical ridges bear- 

 ing the salient tubular mouths of one or more 

 rows of zocecia. At the upper edge the ridges 

 pass into large clusters of apertures. 



Conotubigera and Serietubigera, d'Orb. Closely 

 related to the preceding. 



FIG. 420. 



Semifascipyra varidbilis, d'Orb. Cretaceous 

 France. Side view of zoarium, 10 /i. 



Family 6. Fascigeridae. d'Orbigny (emend.) 



Zoaria repent or erect, lamelliform or branching, generally the latter. Zoo2cial apertures 

 arranged in bundles or clusters, in which they are contiguous. Jura 

 P~7" gg"\ to Recent. 



~\ *'y Filifasdgera, d'Orb. (Fig. 421). Zoaria repent, irregularly 



Ejf branching. Apertures erect, in successive groups of from tw r o to 

 <^\ I fit nve O1 more ' Growth terminal. Cretaceous and Tertiary, 

 i*- N. -J f$ Reptofascigera, d'Orb. (Semitubigera, d'Orb.) Zoaria repent, 



growth terminal. Apertures in two series of clusters directed 

 alternately to the right and left. Cretaceous. 



Theonoa, Lam. (Tilesia, Lam. ; Fascicularia, M. Edw. ; 

 Lopholepis, Hagw. ; Multifascigera, etc., d'Orb.), (Fig. 422). 

 Z'Miiu lamelliform or massive, usually free, with an epitheca on 

 lower face ; sometimes in superposed layers. Apertures in 

 elevated clusters, somewhat irregularly distributed, more or less 

 megaem, elongated. Growth peripheral. Jura to Tertiary. 

 L.iiis.1. Upper Cretaceous ; Fasciculipora, d'Orb. (Fungella, Hagw.), (Fig. 423). Zoaria 

 Vincentown, N.J. Speci- . , r ', , . \ j T T / j ^ ^ 



men seen from above and erect, simple, or branching. Apertures crowded, limited to the 

 side, u/i (after convex an( j usually expanded upper extremities of the branches. 



Sides of stems usually without pores. Jura to Tertiary. 

 Frondipora, Imperato. Zoaria bushy, attached at the base ; branches free or 



