VOL. XVI.(2) | INFERIOR-OOLITE ECHINOIDS 173 
This species occurs abundantly in the post-Garantiane- 
’ beds of Dorset, and rarely in the Rubbly Beds of the 
Doulting area, where it is largely replaced by Holectypus 
depressus—the type predominant in the Cotteswold Hills. 
FLolectypus hemisphericus.—‘*'Top-Beds,” Dorset; Rubbly Beds, 
Doulting (Phyllis Colln.) ‘* Conglomerate-Bed,” Maes 
Knoll, Dundry Hill (L.R.) ; Upper Z7¢gonza-Grit equivalent, 
West-End Quarry, Dundry Hill (L.R.); Upper Zrigonza- 
Grit, Cowley, near Cheltenham (L.R.) Witchell records it 
from the C/ypeus-Grit of Stroud,’ and Wright from Hampen 
and Shurdington Hills. 
HOLECTYPUS HEMISPHAERICUS (Agassiz), var. CONI- 
CUS, Wright. 
This variety occurs associated with the typical /Yo/ec- 
typus hemesphericus in Dorset. 
HHolectypus hemisphericus, var. conicus.—‘‘ Top-Beds,” Dorset. 
Rubbly Beds, Doulting (where it is rare). Doulting Stone, 
Foss-Way Quarry, near Radstock (L.R.).? 
HYBOCLYPEUS CAUDATUS, Wright. 
This echinoid is very characteristic of the Lower 77- 
gonta-Grit : and, except for two specimens from the Upper 
Freestone, we have not collected it from any other horizon. 
Mr Upton informs us that at The-Frith Quarry, near Pains- 
wick, it is principally in the lower portion that it occurs. 
Wright remarks that it is a rare form, and records it from 
“the upper beds of the Inferior Oolite; Gryphite-Grit ; 
and the [Upper] 77zgonza-Grit at Hampen [near Andovers- 
ford].” He mentions Birdlip as one of the localities where 
it occurs in the Gryphite-Grit, but at the actual Birdlip 
section there is neither Gryphite-Grit nor Lower 77zgonza- 
Grit. He may have collected it at the Cuckoo-Pen or Tuffley’s 
Quarry. 
Hyboclypeus caudatus.—Lower Trigonia-Grit (discite), Edge 
Common, near Painswick (H.M.H.); Tuffley’s Quarry, near 
the Air-Balloon Inn, Crickley (E.T.P. & L.R.); Ravensgate 
Hill, near Cheltenham; ‘‘ Roadstone Hole,” Cleeve Hill; 
Swift’s Hill and The Frith, near Stroud (C.U.); and Stroud 
Hill (C.U.) 
1 “Geology of Stroud, etc.” (1882), p. 63. 2 Quart. Journ, Geol. Soc., vol. Ixiii, 
(1907), p. 411. 
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