194 CHILOPORA. 



species. C. guernoni, Haime. 



ities. This genus was founded by Haime on a single 

 specimen from the Bathonian of Ranville. It is very closely allied 

 to Cliiloporella, Ulrich, from the Cincinnati group of Ohio. 

 I cannot point to any character that will separate the two genera.. 



Chilopora guernoni, Haime, 1854. 



SYNONYMY : 

 Chilopora guernoni, Haime, 18o4, Bry. jurass. : Mem. Soc. geol. France, ser. 2, 



t. v. p. 213, pi. x. fig. 5. 



Pictet, 1857, Traite Pal. ed. 2, t. iv. p. 162, pi. xcii. fig. 10. 

 ,, ,, E. E. Deslongchamps, 1865, Jur. inf. Norm. : Mem. Soc. 



linn. Norm. t. xiv. p. 151. 



,, ,, Vine, 1883, 3rd Rep. Foss. Polyz. : Rep. Brit. Assoc. 1882, 



p. 265. 



Diagnosis. Zoarium flat, frondose. Thickness of frond about 

 twice as great as that of an ordinary Diastopora. Surface irre- 

 gular, but not definitely pustulate. Mesopores large ; very 

 irregular in distribution, but generally abundant. Apertures 

 generally circular ; often oval or irregular through crowding ; 

 a crescentic lunarium on the lower margin. 



Distribution. Bathonian : Ranville. 



Affinities. This species is represented in the British Museum 

 by two specimens, one of which was sent in the Tesson Collection 

 identified as such. The lunaria, however, were not shown in the 

 specimen, and thus it agreed in its characters with Heterotrypa, as 

 a new species of which I was inclined to regard it. Its general 

 appearance so closely resembled Haime's Chilopora guernoni, that 

 I felt it was probably the same species, though, as matters stood, 

 I was bound to put them into separate families. A second 

 specimen has since been found in the collection which reconciles 

 the former with Haime's figures. In some parts of the zoarium 

 the lunaria can be recognized, though in the rest of it they have 

 been worn away ; thus such parts are reduced to the condition of 

 Heterotrypa. 



LIST OF SPECIMENS. 



60235. Bathonian Calcaire a polypiers. Ranville. Tesson Coll. 

 60355. 



