EXPLANATION OF PLATE I. C. 



LOWER PALAEOZOIC ZOOPHYTA AND POLYZOA. 



1 FISTULIPORA DECIPIENS (M'=Ooy). Portion of large mass natural size, from near Aymestry, 

 exhibiting the sm-face above, and rough weathered section below, shewing the main tubes distinct 

 from the capillary ccenenchynie. 



1 a Horizontal section magnified six diameters, shewing the thick-walled, non-lamelliferous circular main 



tubes, and the small polygonal intervening ones. 



1 * Side view of weathered portion, shewing the diaphragms in both sorts of vertical tubes. 



2 PAL^OPORA SUBTUBULATA (M'^Coy). Portion of weathered mass natural size, from Coniston 



Water Head, shewing the main tubes projecting in one part. 



2 a Portion of ditto magnified six diameters, shewing the weathered appearance of the base of the 



lamelliferous tubes and the interstitial tubules. 



2 b Portion of weathered mass magnified six diameters, shewing the projecting lamelliferous tubes, and 



intervening polygonal tubuli. 



3 PAL.EOPOEA ? FAVOSA (^PCoy). A portion of large mass, natural size, from the limestone of 



Craig Head, shewing the upper surface and rough vertical fracture, exhibiting the diapln-awms in the 



main tubes. 

 3 a Vertical section, magnified five diameters, shewing the narrow interstices or apparent wall of the 



lamelliferous tubes and diaplu-agms to be composed of rows of cells ; with the internal lamellar sulci. 

 3 b Horizontal section, magnified five diameters, shewing the twelve short lamellae in the main tubes, and 



intervening polygonal tubuli. 

 3 c Small mass (cast) from the Sandstone of Dalquorhan, natural size. 



3 d ■ One of the stars of ditto magnified five diameters, shewing the impressions left by the central axis 



and component cells. 



4 PAL^OPORA MEGASTOMA (M<=Coy). Portion of large mass shewing weathered impression of the 



surface, natural size, from Coniston. 



4 a Stars of ditto, magnified two diameters, shewing the lamellae, cellular stmctm-e of the diaphragms, and 



few intervening tubuli. 



4 b Side view of weathered lamelliferous tubes ; part of large mass, natural size. 



5 NEBULIPORA PAPILLATA (M-^Coy). Natmal size, coating an Orthoceratite, from Coniston. 



5 a Portion of surface magnified six diameters. 



6 NEBULIPORA EXPLANATA (M"Ooy). Portion of irregular foliaceous expansion, natural size, from 



Coniston. 



6 a Portion of surface magnified four diameters, shewing the clusters of larger tubes, including a few small 



ones, and surrounded by the numerous uniform smaller tubuli. 



7 NEBULIPORA LENS (M'Coy). Portion of mass, containing numerous lenticular specimens, natural 



size, from Caradoc Sandstone at Horderly, the right-hand figure shewing upper surface with the imperfect 



star-like clusters of larger tubes, at regular distances, surrounded by numerous uniform smaller tubes ; 



the left-hand figure shews the central nucleus of base ; the edge of the mass shews the form of the 



section, of two individuals. 

 7 a Portion of surface magnified four diameters, shewing the nebular clusters of larger tubes amongst the 



smaller. 

 7 b View of portion of vertical weathered section, magnified ten diameters, shewing the diapln-agms of the 



tubes. 



