78 PROCEEDINGS COTTESWOLD CLUB 1912 



specimens from the Murchisonce and Scissum-Beds have the 

 base flat, or nearly so, those from the higher beds have 

 it noticeably concave. This feature is exhibited by a speci- 

 men, which has been examined since our main paper was 

 published, from the Gryphite-Grit {shirhidrnice) of Charlton 

 Common, near Cheltenham, as well as by that from the 

 Buckmani-Gvit {post-discitce) of Withington, near Cheltenham, 

 which was figured in our main paper, plate XVI, figs, ^a 

 and h., under the name " Galcropygus agariciformis Wr." 



Except for this difference in the matter of the base the 

 specimens from all the horizons mentioned appear similar, 

 but it is probable that tliis feature may ultimately prove to 

 be sufficient for specific differentiation. 



Byndfoydensis-BL'ih. — Limekiln yiuiny, Cortoii Downs. MurchisoneB- 

 Beds (s.l.). Horn Park; Quarry near South Perrott; Lime-Works, 

 Misterton ; Strutter's Hill, Pitco mbe, n ear Bruton. 



GALEROPYGUS AGARICIFORMIS (Wr.) var. CONICUS 



Paris. 

 Another example of this variety has been obtained from 

 Holway Hill, near Sherborne, from the beds of murchisonce 

 date. 



HOLECTYPUS HEMISPHERICUS (Agassiz) 



This echinoid is extremely abundant in the Top-Beds of 

 Dorset and many individuals are of the conical forms — H. 

 hemisphencus var. conicus Wr. 



Zi^^a^'-Bed {sig::ag) — Allotment Quarry. Top-Beds. — Allotment 

 Quarry ; road-cutting and cliffs. Burton Bradstock ; " Garden 

 Section," Shipton Gorge; WaldiLch; Bell Quarry, near Lower 

 Loders ; Jack's Hill Quarry, Mapperton ; Whaddon Hill ; Barrow- 

 field Quarry ; Horn Park ; Broadwinsor ; railway-cutting and 

 quarries Crewkerne ; Upper Ttigonia-Gni [garantiance], Dinning- 

 ton ; Woolston ; Sliotwell ; Hadspen ; Lamyatt Hill, near Bruton 

 (conical variety). 



HYBOCLYPEUS GIBBERULUS Agassiz 

 This sea-urchin is rare. 



Top-Beds [schlaubachi) — Allotment Quarry, Burton Bradstock ; 

 [truellei) Loder's Cross ; Dinnington, 



