ME. E. A. WALF0RD ON BRYOZOA FROM [Feb. 1 894, 



6. On some Bryozoa from the Inferior Oolite of Shipton Gorge, 

 Dorset. Part II. 1 By Edwin A. Walford, Esq., E.G.S. 

 (Bead April 12th, 1893.) 



[Plates II.-IV-] 



The Cheilostomatous Bryozoa have hardly been recognized with 

 certainty in the Jurassic series, and Haime mentions two forms of 

 the Escharidse in his monograph 2 with considerable doubt and without 

 illustration. In the little group dealt with in this paper are mingled 

 both cheilostomatous and cyclostomatous features, but the former 

 predominate, and, for the present, it is desirable to place the group 

 there. We thus open a field for investigation which will trench 

 deeply into the ground hitherto occupied by the Cyclostomata. 



Messrs. "Waters, Vine, and Ulrich have written of cheilostomatous 

 structure in Palaeozoic fossils ; the English Jura now leads backward 

 also the relations of this sub-order, and we need to scan this distant 

 horizon of bryozoan development for signs sufficient to guide us on 

 our way. 



Aiter I had read Part I. of my paper in 1889 I withdrew for 

 further study two of the species related to those that I am about to 

 describe. So many of their features were dissimilar to the Entalo- 

 phora among which I had placed them, similar as* they were in 

 general aspect, that it seemed necessary to find a place for them 

 elsewhere. 



The characters of the two sub-orders Cheilostomata and Cyclo- 

 stomata merge as we pass backward in time. This merging the 

 accessory organs of the genus and species here described and figured 

 will illustrate. Mr. A. W. Waters has paved the way to the same 

 conclusion in a recent paper. 3 He writes : — ' In the Cretaceous 

 Melicertitidee the characters are in the main chilostomatous united 

 with some that are cyclostomatous, and also in a very large section 

 of Palaeozoic fossils there are important structures similar to those 

 in recent Chilostomata." 



It may ultimately be necessary to erect a new sub-order for the 

 association of these intermediary forms. When, however, we 

 understand better the various stages of growth and eccentricities of 

 arrangement of cells, then perhaps the number of genera and 

 species we have made and are making may be pruned to as moderate 

 a growth as that to which Dr. Ed. Pergens, in his laborious work, 4 



1 For Part I., see Quart. Journ. Geol. Soc. vol. xlv. (1889) pp. 561-574, 

 pis. xvii.-xix. 



2 ' Descr. des Bryoz. Foss. de la Form, jurass.,' Mein. Soc. G6ol. France, 

 ser. 2, vol. v. (1854) p. 217. 



3 ' On Chilostomatous Characters in Melieertitidte and other Fossil Bryozoa,' 

 Ann. & Mag. Nat. Hist. ser. 6, vol. viii. (1891) pp. 48-53, pi. vi. 



4 ' Revision des Bryoz. du Cretaee figures par d'Orbigny, 1 Partie — 

 Cvclostomata,' Bull, Soc. Beige de Geologie, vol. iii. 1889 (Memoires), pp. 305- 

 400. 



