HARDWICKE'S SCIENCE-GOSSIP. 



245 



The species is named D. cupula, and Mr. Waters 

 identifies the Tertiary type with the Cretaceous type 

 of D'Orbigny. As only one specimen was found by 

 the author, it is impossible to say whether this habit 

 is a varying or a constant one, but the identification 

 may be safely relied upon, and the identity is so far 

 valuable as regards colonial growth, but no farther. 



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In Dr. Manzoni's work on the Bryozoa of the Plio- 

 cene of Castrocaro (PI. vii.) three types of Diastopora 

 are given, one of which is doubtfully referred to Z>. 

 patina. Lam. (?) as occurring in a fossil state frequently 

 at Castrocaro, and as living in the Arctic and Boreal 

 seas ; another as D. (Berenicea) striata, J. Haime, a 

 Jurassic fossil form, and the other as new, which is 



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Fig. 168.— Types of Oolitic Diastopora. i, 2, 3, Diastopora veniricosa, Vine ; 4 to 7. Diastopora oolitica. Vine. 



Mr. Busk, in his Brit. Mus. Catalogue, PI. iii. "Cy- 

 clostomata," had previously described and figured a 

 species, discoidal and cup-shaped, which he identified 

 as the D. congesta of D'Orb. In this a secondary 

 disk arises from the surface of the primary one, the 

 true meaning of which is that in the colonial growth 

 layer after layer of cells may eventually succeed each 

 other till from a tiny speck the habit becomes, in a 

 sense, massive, rather than merely discoidal. It is 

 well to note this feature. 



described as D. expansa, Manzoni. The last species 

 forms very large expansions, and the cells are con- 

 tiguous, and in the portion figured (PI. vii. fig. 83) 

 they are in lines. It is but just to the author to say 

 that he is doubtful as to whether the species should 

 be placed with Diastopora. 



In the " Crag Polyzoa," Mr. Busk seeks to esta- 

 blish as a distinct type the Mesenteripora of Blainville, 

 and describes and figures a species which he names 

 M. 7neandrini, S. Wood. In this type the zoarium is 



