402 



J. F. BLAKE AND W. H. HTTDLESTON ON 



Name. 

 Modiol.'i suba?quiplicata, 

 Goldf. 



Mytilus jurensis, Merian. 

 Avicula Struckmanni, BeLor. 

 Lima subantiquata, Bom. 



fragilis, Bom. 



Pecten qualicosta, Et. 

 striata, Miinst. 



intertextus, Bom. 

 virdunensis, Buvig. 

 subtextorius, Goldf. 



Notes. 

 The shell so identified 

 seems to take the 

 place of M. bipartita, 

 Sow., of the Lower 

 Calcareous Grit &c. 



So named in some col- 

 lections. 



A somewhat doubtful 

 identification. 



Varieties of the fibro- 

 s?£S-group. 



The P. cancellatus of 

 Bean. 



Localities. 

 Main Limestones of the 

 Weymouth district ; 

 Sike Grate. 



1 Main Limestones of the 

 J Weymouth district. 

 Osmington Oolite, &c. 



Rag of Ayton, &c. 



Osmington Oolite, &c. 



Chiefly Oolite and Rag of 

 the Malton district. 



Trigonia-be&s, Wey- 

 mouth. 



Marcham and Westbrook. 



Description of a new Species of Araucarites from the Coralline 

 Oolite of Malton. By W. Carruthers, Esq., F.R.S., F.G.S. 



Araucarites Hudlestoni, Carruthers, sp. nov. 



Cone oblong-ovate, supported on a thick branch, which is clothed 

 with leaves to the base of the cone. Scales numerous, supported on 

 a thick axis. Scales small, wingless, with a well-marked lepidium 

 or upper scale. Seed small, oval, borne at the base of the scale. 



The two cones, found by Mr. Hudleston, are mature, and each 

 scale, except those imperfectly developed at the apex and base of 

 the cone, bears a seed. The cones are small, being 3| inches long by 

 2\ inches broad. The scales also are small in proportion to the 

 thickness of the axis. The axis must have been the first part of the 

 organism to decay, as the matrix in which the cones were imbedded 

 was yet unsolidified, and has been pressed into the cavities left by 

 the decayed axes. The scales, however, persisted until the rock 

 became indurated ; and when this decay took place, the cavities were 

 filled in with crystalline calcite, which now represents the external 

 form of the scales and seeds, often with singular minuteness. 



The fragment of branch which still adheres to one of the cones, 

 exhibits the bases of the leaves, which were of considerable size 

 and thickness, as is shown by the transverse section of the calcite 

 cast. 



The characters which I have described as found in the scales 

 show that this Araucaria belonged to the Colymbea section of the 

 genus, now represented by two species in South America, one in 

 Australia, and a fourth in New Caledonia. The Araucarites splice- 

 rocarpus, from the Inferior Oolite of Bruton, and the A. pippincj- 

 forclensis, from the Wealdens at Pippingford, belong to the same 

 section of the genus. 



