148 J. 8. Gardner — Correlation of the Tertiary Series. 



struct their dwellings of sand or small stones, rather than to Serpula, 

 or other recorded fossil genera that form calcareous tubes, and are, 

 also, more or less gregarious. The recent genus Sabella, which 

 belongs to the former division, contains species which construct 

 calcareous dwellings ; and Prof. M'Coy has described a species of 

 this group (S. antiqua) 1 as occurring in the Carboniferous rocks of 

 Ireland. But generic identifications founded upon such remains are 

 necessarily conjectural and doubtful, as they yield no information 

 regarding the anatomical structure of their former inhabitants; yet are 

 nevertheless useful, in default of more precise knowledge, as aids to 

 classification. With this view, and having regard also to the mem- 

 branous tube, solitary life and habit of collecting organic debris for 

 affixing to their domiciles, I am disposed to refer the makers of these 

 dwellings to the genus Terebella, which includes one species, having 

 analogous habits, the well-known shell-collecting Terebella conchilega. 

 Though Dr. Mantell failed in his interpretation of the natural 

 position, and abandoned the name he first gave to these remains ; 

 yet his description of them is so clear and concise that the specific 

 name he originally proposed must be retained, although objectionable 

 as regards objects so generally distributed in the Chalk. I therefore 

 propose that they be designated Terebella Lewesiensis, Mant. sp., 

 until more authentic information regarding their origin is obtained. 



II. — On the Correlation op the Bournemouth Marine Series 

 with the Bracklesham Beds, the Upper and Middle Bagshot 

 Beds of the London Basin, and the Bovey Tracey Beds. 



By John Starkie Gardner, F.G.S., M.G.S. of France, etc. 



IN the spring of the year 1878 I brought under the notice of the 

 Geological Society a paper describing for the first time as Marine, 

 the Upper Series of the Bournemouth strata, present in thickness to 

 the east of Bournemouth Pier. The publication has been delayed, 

 but the present sketch will only to a very slight extent forestall it, 

 and is written simply with a view to make clear the synchrony of 

 the Bournemouth Marine Beds with the lower part of the BracMe- 

 sham Beds of the Hampshire Basin, the Middle and so-called Upper 

 Bogsliot Beds of the London Basin, and the Bovey Tracey Beds, the 

 true position of the latter, especially, being more clear at the present 

 moment than it was a few months ago. I propose first to describe 

 briefly the Bournemouth Marine Strata, and then the other formations 

 with which I have correlated them, in the order in which they are 

 mentioned above. 



The Marine Bournemouth Beds. — I have in the paper read 

 before the Geological Society, pointed out the exact equivalents of 

 each of the beds composing the series in the Alum Bay section. 

 The marine or rather brackish-water beds first appear in a landslip 

 almost under the Meyrick Boad, a point some half mile east of 

 Bournemouth Pier. From this point to Hordwell Cliff none of the 

 1 Carb. Foss. of Ireland, p. 171, pi. 4, fig. 11. 



