252 W. H. Sudhdon—On the TorhsMre Oolites. 



II.— Contributions to the PALiEONTOLOGY of the Yorkshire 



Oolites. 



By WiLFKiD H. HuDLESTON, M.A., F.R.S., F.G.S. 



(Concluded from p. 207.) 



Genus Action, Montfort= Toma^e/Za, Lamarck. 



Two species, or at least two well-marked varieties of one species, 

 occur in the lower beds of the Inferior Oolite of Yorkshire, which 

 cannot be referred to ActcBonina, but which are provisionally placed 

 under Actceon. The type is the well-known Auricula Sedgvici, Phil., 

 characteristic of the Dogger, though far from common, and almost 

 impossible to obtain in a perfectly satisfactory state. Hence the 

 chief difficulty. 



These shells are ovate, with a shortish spire, the last whorl ventri- 

 cose, surface spirally striated (more deeply than in any species of 

 ActcBonina), columella thickened, and somewhat oblique, but not 

 plicated, if I have correctly interpreted the available specimens. 

 The aperture is relatively shorter than in Actceontna, and, owing to 

 the effuseness of the outer lip, almost semilunar in outline. The 

 general aspect of these shells is greatly that of Actcson ; but, as far as 

 my experience goes, they are without the fold.' 



92.— AcTiEON Sedgvici, Phillips, 1829. PI. V. Fig. 4.^ 



1829-1835. Auricula Sedgvici, Phillips, G. T., p. 129, pi. xi, %. 38. 



1849. Aci(eon Sedffwici, D'Orb (Phil.), Prod. i. p. 263. Et. Baj. 



1850. Act(eon Sedffvici, VhU.. ; Morr. and Lye. Gt. Ool. Moll. p. 118, pi. 



15, fig. 9. 

 18-54. Actceon SedgwicJcii, Phil. ; Morris, Cat., p. 233. 



1875. Actceon Sedgwickii, Phillips, G. T., 3rd edition, p. 260, pi. xi. fig. 33. 



Compare also, 

 1837. Tornatella pulla, Koch and Dunker, Yerstein. pp. 33, pi. 2, fig. 11. 

 1848. Tornatella pulchella, Deslongchamps, Mem. Soc. Linn. Norm. viii. p. 162, 



pi. 18, fig. 4. 

 1850. Actceon puKus, Morris and Lycett, Gt. Ool. Moll. p. 119, pi. 15, fig. 11. 

 1852. ActcBonina pulchella, D'Orb (Desl.), Terr. Jur. ii. p. 169, pi. 268, figs. 7, 8. 



1876. ActcBonina pulla, K. and D., Tate and Blake (Yorkshire Lias), p. 356. 

 Bibliography, etc. — The references, given for comparison as above, 



may in some cases be more applicable to the Actcson pitlhis of Morris 

 and Lycett, presently to be described as a variety, which occurs in 

 the Millepore Kock of the coast. All the specimens seen by me 

 from the Dogger more resemble Phillips' type, whether they are 

 small or great; consequently I should be led to suspect that this is 

 the form noted by Tate and Blake in the Upper Lias, where a single 

 specimen was found. In the few cases where the aperture has been 

 visible it is invariably without plication. Should a specimen exhibit- 

 ing such strong plication as is depicted by Deslongchamps in his 

 Tornatella jmlchella ever be found, the case would be different. It 



' Stolizcka notices this group of shells (op. cit. p. 404), and is disposed to place 

 i\\era.\mA&T Bullinula, Beck [Ballina, Per. apud H. and A. Adams). He observes 

 that the two oldest species apparently belonging to this genus are the Jurassic 

 Actceoi/ina pulchella, D'Orb., and Act. striato-sulcata, Zittel and Goubert. Sub- 

 sequently he refers, though with more doubt, to the Yorkshire fossils now under 

 consideration. 



2 For Plate V., see the May Number of the Gbol. Mag. 



