H. B. Woodicard — A Small Anticline near Bedford. 439 



This limestone is largely composed of a small greojarious variety of 

 Isochilina Ottawa, Jones (see Geol. Mag., July, 1903, pp. 300-304) ; 

 and in this condition it resembles other specimens collected by 

 Colonel Grant, and sent by him to the British Museum. 



The particular specimen under notice is shown in Fig. 1. It 

 approaches in lateral outline to Cijpridina brevimentum, Jones, Kirkby, 

 and Brady (Foss. Entom. Carbonif., pt. i, 1874, p. 16, pi. ii, figs. 

 15-19, especially fig. 15ff). It differs, however, from that species 

 in the following particulars : — 



It is moi"e definitely oblong ; straight on the back, with its postero- 

 dorsal angle, and not the postero-ventral part, projecting. The 

 hook or hood is narrower and sharper than in C. brevimentum ; 

 attenuated partly by loss of substance. 



The notch below is deeper than in the figures quoted ; and it has 

 a bold outline with an ogee curve. The cast itself has suffered 

 a slight damage by having lost some of its convex surface, and the 

 middle part of both its ventral and its dorsal edge, when it was 

 being detached from the block. With the above-mentioned dis- 

 tinctive characters we may regard it provisionally as a separate 

 species, with the name of Cypridina antiqua, sp. nov. 



Pig. 1. — Cypridina antiqua, T. R. Jones, sp. nov. Magn. 3 diam. Of Ordovician 

 age? From Glacial Drift (limestone of the Trenton series), Wenoma, on the 

 shore of Lake Ontario, near Hamilton, Canada. 



This internal mould of a left valve (Fig. 1) is somewhat decorticated 

 across the middle of its convexity. The cast consists of dark-grey, 

 fine-grained, and slightly micaceous mudstone, distinct from the 

 limestone to which it is attached. It measures 15 millimetres in 

 length and 10 in height (from dorsal to ventral edge). 



III. — Note on a small Anticline in the Great Oolite Series 



AT ClAPHAM, north OF BEDFORD.^ 

 By HoKACE B. "Woodward, F.R.S. 



IN the broad Alluvial tract which borders the Ouse between Oakley 

 and Clapham, north of Bedford, there is a gravel-pit in which 

 a small anticline of the Great Oolite was abruptly encountered amidst 

 the regularly stratified river-deposits. The pit is situated immediately 

 north of the Oakley road and east of the Midland Eailway. 



The trend of the fold was N.N.W. and S.S.E., and the upraised 

 strata consisted of Great Oolite Limestone and Clay, with bordering 

 portions of Cornbrash, and probably also of Kellaways Beds. The 

 ridge was exposed over a space about 20 yards in length, and the 

 arch of Oolite strata, about 18 yards in breadth, was clearly displayed 

 in a transverse section, flanked on either side by undisturbed beds 



^ Bead before the Meeting of the British Association, Cambridge, August, 1904. 



