94 Oeological Society. 



mandibular teeth. The parts of this specimen which are preserved 

 are — both upper and lower jaws, parts of the palate -quadrate arch, 

 of the hyoid bones, ethmoidal region, brain-case, &c. Portheus 

 gaultinus is the name suggested for this species, 



Hypsodon minor, Egerton, figured in Dixon's ' Fossils of Sussex,' 

 will now, it is thought, on account of the regularity of its teeth, 

 have to be placed in the genus IchtJu/odectes, Cope. 



Another small mandible from the Lower Chalk of Dorking, which 

 is distinguished by the regularity of its slender, incurved, and 

 oblique teeth, it is proposed to call Iclithyodectes elegans. 



June 20th, 1877.— Prof. P. Martin Duncan, M.B., F.R.S., 

 President, in the Chair. 



The following communications were read : — 



6. " On the Cretaceous Dentaliadse." By J, S. Gardner, Esq., 

 F.G.S, 



In this paper the author described the Dentaliadse from the 

 British Cretaceous rocks, of which he enumerated the following 

 species : — DentaJium decussatum, Sow., and var. eUipticum, Sow. 

 (Gault) ; D. medium, Sow. (Gault, Greensand, and Grey Chalk) 

 D. divisiensis, sp. n. (Upper Greensand) ; D. alatum, sp. n. (Gault) 

 D. cyUndricum, Sow. (Blackdown) ; D. acuminatum, sp. n. (Gault) 

 D. suhtetragonum, sp, n. (Gault); D. tetragonum, sp. n. (Gault) 

 Entalis Meyeri, sp. n. (Blackdown) ; and Gadus gaultinus, sp. n. 

 (Gault). 



10. " The Exploration of the Ossiferous Deposit at Windy KnoU, 

 Castleton, Derbyshire, by Rooke Pennington, Esq., LL.B., F.G.S., 

 and Prof. W. Boyd Dawkins." By Prof. W. Boyd Dawkins, M.A., 

 F.R.S., F.G.S. 



In this paper the author gave an account of the results of a 

 further exploration of the ossiferous deposit at Windy Knoll. The 

 section exposed included the following beds in descending order : — 

 Clayey debris without bones, probably quarry rubbish ; yellow clay, 

 with large blocks of limestone, &c., and containing bones of Bison, 

 Reindeer, Hare, Wolf, Fox, and Bear ; and stiff yellow loam rest- 

 ing on the surface of the limestone. The bones and teeth of animals 

 were generally perfect, and had . been buried in their natural posi- 

 tions. The entire skeleton of a Eoedeer was found in the upper 

 part of the yellow clay. As the work proceeded the limestone floor 

 descended rapidly, and the ossiferous clay increased in thickness 

 from 8 to 21 feet ; at the bottom it rested on loose fragments of 

 limestone, filling a vertical shaft. The author concluded that the 

 rock basin containing the ossiferous deposit was originally a swallow- 

 hole, plenty of which occur in the immediate neighbourhood, and 

 that the vertical shaft, filled with limestone fragments, probably led 

 down into a cavern through which drainage took place. The rock- 

 basin forming the mouth of the swallow-hole was lined with clay. 



