VOL. xviii. (i) [NFERIOR-OOLITE ECHINOIDS 77 



COLLYRITES OVALIS (Leske) 



This fossil is extremely abundant in the Top-Beds of the 

 Burton-Bradstock district — especially in the portion which 

 is of schlcenbachi hemera. 



Zigzag-Bed (zigzag) — Chideock Quarry Hill, near Bridport ; Power- 

 stock Station ; Allotment Quarry, road-cutting and cliffs, 

 Burton Bradstock ; King's PTt, Bradford Abbas : Top-Beds, - 

 (portion of schlcenbachi date), Allotment Quarry ; Walditch ; 

 Hensacre ; Whaddon Hill ; Horn Park ; Broadwinsor ; and 

 North Perrott. 



COLLYRITES RINGENS (Agassiz) 



This echinoid is commonest in the neighbourhood of 

 Burton Bradstock. 



Zigzag-Bc(] (zigzag) — Allotment Quarry, Burton Bradstock. Top- 

 Beds (portion of sc/e/«ewb«c/iz datX') ; Mlotment Quarry ; Walditch, 

 Vinney Cross ; Bell Quarry, Lower Loders ; Jack's Hill Quarry, 

 Mapperton ; Barrowiield Quarry ; Whaddon Ilill (Stoke Knap) ; 

 Broadwinsor ; Dinnington : (truellei) Half- Way House : Garan- 

 (iana-Beds (garantiance), Dinnington; Limekiln Quarry, Hadspen. 



DIPLOPODIA PENTAGONA M'Coy 



Specimens of this echinoid occur not uncommonly in 

 the Upper Coral-Bed [truellei) of Dundry Hill and occasionally 

 in the Upper Trigonia- and Clypeus-Qnis of the Cotteswolds. 



Truellei-T>e-gos\t. — Stoford Quarry, near Yeovil Junction. 



DIPLOCIDARIS DESORI Wright 



The specimen upon which this species was founded' 

 is in the British Museum, South Kensington [Reg. No. E. 1535] 

 and consists of one large plate, coarsely granulated, with one 

 tubercle. It is not well preserved and is labelled " Inf. Oolite, 

 Yeovil." Wright thought it probably came from the " Upper 

 Lias." 



GALEROPYGUS AGARICIFORMIS Wright 



In the Cotteswold Hills, this echinoid is very characteristic 

 of the Pea-Grit — a deposit of murchisonce hemera and occurs 

 also in the Scissum-'&eds. South of the Mendips it also 

 characterises rock of nmychisoncc and scissi hemerae. 



A closely allied form, however, occurs in Beds of post- 

 discitce and shirbuirnicB dates in the Cotteswold. Whereas the 



I. Mouograph, pp. 56-58. 



