150 REPORT — 1884. 



pora megastoma (M'Coy),is only its younger stage ; and if, on the other 

 hand, the latter form be held to be a Polyzoon, then its later stage is only 

 a further development of Polyzoal life, and Fistulipora minor, and the 

 other forms indicated in Dr. Lindstrom"s paper in the " Annals," must of 

 necessity be removed from the Tabulate Corals.' 



It is impossible to gainsay the logic of Mr. John Young, however we 

 may be inclined to controvert the views of those who still hold the Polyzoal 

 affinity of Silurian Biscopora. I do not, however, speak without a full 

 knowledge of the whole of the forms previously referred to, and at present 

 it would be better to defer any positive opinion in the face of the really 

 honest work of Dr. Lindstrom, Smitt, Prof. A. Nicholson, or Mr. John 

 Young. Yet I cannot forbear remarking that, so far as I can rely upon 

 my own work, I cannot speak in favour of the views of those who hold 

 the belief that any natural affinity exists between the Biscopora of the 

 Silurian rocks, and the Biscoporella of present seas. In this review, then, 

 I must except the Palaeozoic forms altogether, and I would prefer, for 

 the present, to leave also the Mesozoic as well. 



Genus Lichenopora, Defranc. 



' Zoarium discoid, raised, simple, or composed of many confluent disks, 

 entirety adnate, or partially free, and sometimes stipitate, developed on a 

 thin lamina, which usually forms a border round it. Zooecia distinct or 

 connate in single radiating lines, or multiserial.' — Hincks, p. 472. 



133. Lichenopora hispida, Flein. (Hincks,p. 47S)=Biscoporella Jiispida, 



Gray ; Busk, ' Crag Pol.' p. 115. Discocavea (Lichenopora') 

 aculeata, D'Orb. r ' Reteroporella radiata, Busk, ' Crag Pol.' 

 p. 127, pi. xix. fig. 2. 

 Range.— ?Cor. Crag (S. Wood) ; Scotch Glacial Deposits (Geikie) ; 

 Post-Pliocene, Canada (Dawson). Living. 



134. Lichenopora eadiata. Aud. (Hincks, p. 476)=Biscoporella sp., 



Manzoni, ' Bry. du Plioc. de Rhodes.' 

 Range. — Pliocene; Rhodes (Manz.) ; Bruccoli, Sicily (Waters). 

 Living. 



135. Lichenopora verrucaria, Linn. Fabr. (Hincks, p. 478) =Biscocavea 



and Unicavea, D'Orb. ' This in many respects resembles D. 

 radiata. It is not the Discoporella verrucaria of Manzoni (' Bry. 

 Foss. Ital.' 4th Contr. pi. vi. fig. 33), which may be Bia- 

 stopora flabellum, Rss.' (Waters, 'Bry. Bay of Naples,' p. 271). 

 Range. — Living. Fossil (?). 



136. Lichenopora crassjuscula, Smitt (Scand. ~Brjoz.)=Tubulipora 



Grignonensis, Busk, ' Crag Pol.' p. 116. 

 Range. — Crag (Busk). Living, Northern Seas. 

 137." Lichenopora regularis, D'Orb. (Hincks, p. 470) ; D'Orb. ' Pal. 



Fr.' 

 Range. — French Cretaceous beds. Living, Shetland. 



Genus Domopora, D'Orbigny. 



Bomopora, D'Orb., 1874, ' Prod, de Pal.,' Busk ; Befrancia, (part) 

 Reus.?, Hagenow, Sars, Manzoni ; Ceriopora, (part) Goldfuss ; Stellipora, 

 (part) Hagenow. 



' Zoarium massive, cylindrical or mammiform, simple or lobed, formed 

 of a number of subcolonies superimposed one upon the other ; the whole 



