256 KEPOBT— 1882. 



I cannot, however, see my way clearly at present to accept without a 

 demur his conclusions. As a ' suggestive sketch of the genealogical 

 arrangement of certain famiUes,' Mr. Longe offers the following : — 



' Race DiASTOPOEiD^. 



' Families or genera represented in the Oolites : — 

 ' Creeping. — Biastopora. 



' Foliaceous. — Bidiastopora, Mesenteripora, Elea, EscJiara. 

 ' Dendroid. — Cricopora, Melicertttes, Entaloplwra.'' 



The remaining portion refers to species found in the Chalk and sub- 

 sequent periods. 



DlASTOPORA DILUVIANA. 



Berenicea diluviana, Lamx. B. diluviana, Haime. 

 Berenicea dihcv., or Biastoiwra diluv. of authors generally. 

 Bepto-multisparsa diluv., D'Orb. 



This species is present in the Inferior and also in the Great Oolite, 

 and the name should be restricted to the thin, papyraceous specimens 

 which encrust, with varying habits, stones and shells. The Zoarium, in 

 its youngest stage, begins with a primary cell, which gi-adually increases 

 in size till a small fanlike outline is reached, some of the cells turning to 

 the right, others to the left of the primary one. After this the Zoarium 

 is of varying habit, and all the cells are deeply immersed, and specimens 

 appear like a continuous coeniceum, very much punctured, the peristomes 

 only rising but very slightly above the surface. The cells are distinct, 

 and in very sheltered parts of the Zoarium the distal portion of the tube 

 is much produced. 



Localities. — Inferior Oolite abundant at Cleave, near Cheltenham. 

 Cabinets of Mr. Longe and my own. 



DlASTOPORA MICROSTOMA, Michelin. 



Berenicea microstoma, Haime, pi. vii. fig. 3, a.d. 



„ undtdata, D'Orb. (Pal.), Prance. 

 Bepto-multisparsa microstoma, D'Orb. 



I feel certain that this species, though much smaller in the cells, has 

 at times been identified with the one above. It is only on very rare 

 occasions that the two could be possibly confounded. The most distin- 

 guishing features of this species are the proliferous habits and the small- 

 ness of the cells. Some of the cells, too, appear like those of Biastopora 

 Lucensis. 



Localities. — Abundant in the Great Oolite, generally encrusting spe- 

 cies of Terehrattda. The cabinet of Mr. Walford very rich. Haime 

 gives Hampton Cliffs as one of the localities from which he obtained 

 his specimens. 



I wish to draw particular attention to this species on account of its 

 peculiar proliferous habits. Many of the fresh colonies originate from 

 some of the marginal cells of the older colony. They begin with a 

 primary cell as ordinary Biastopora, and the zoarium very soon assumes 

 a fanlike, then a circular, habit. Newer colonies also cover the older 

 ones, and the innumerable growths give a very thick appearance to the 

 blended Zoaria. 



