466 
THE CRETACEOUS ROCKS OF BRITAIN. 
List of Fossils from the Middle Chalk in Bedfordshire 
and Hertfordshire. 
The following list has been compiled from several sources, and the 
particulars as to localities and collectors are given below. 
Of the species from the Rh. Cuvieri zone, those numbered 
1 are from the quarry near Pitstone, mentioned on p. 463, and 
were obtained by Mr. J. Rhodes, the fossil collector of the Geological 
Survey. 
Those numbered 2 are from the quarry by Hitchin Station. They 
were collected at various times by Mr. W. Hill, and were identified 
by me. This list includes most of the characteristic zonal fossils, 
and the assemblage is similar to that in the same zone at Dover. 
Column 3 includes a few species found by myself at Ash well. 
Of the fossils from the Terebratulina zone, those indicated by the 
figure 1 are species found by Mr. Rhodes at Coldharbour quarry, 
near Dunstable. 
The second column shows those found in this zone near 
Luton. Most of the specimens are in the collection of Mr. J. 
Saunders and were named by me, but a few were obtained by 
Mr. Rhodes, and were named by Messrs. Sharman and Newton. 
Those numbered 3 are from Hitchin, and were collected by Mr. 
Hill from the beds above the first line of flints in the quarries by 
the railway, and in Mr. Ransome’s quarry further south. 
Those numbered 4 were found by myself in the two quarries 
near Baldock. 
— 
Zone of 
Rhyn. 
Cuvieri. 
Terebratulina 
Zone. 
Pisces. 
Lamna appendiculata, Ag. - 
— — — 
— 
2 
— 
— 
Oxyrhina Mantelli, Ag. - 
— — — 
— 
2 
— 
— 
Ptychodus decurrens, Ag. 
- 2 - 
— 
— 
3 
— 
„ latissimus, Ag. - 
„ mammillaris, Ag. 
— — — 
— 
2 
— 
— 
Fish remains - - - 
- — — 
1 
- 
— 
— 
Cephalopoda. 
Am. [Pachydiscus] peramplus, Mani. 
- 2 - 
— 
— 
— 
— 
Rhyncholite (of Nautilus) - 
— — — 
— 
2 
— 
— 
Lamellibranchiata. 
Avicula sp. (smooth) - 
1 - - 
Exogyra haliotoidea, Sow. - 
- 2 - 
— 
2 
— 
— 
Inoceramus mytiloides, Sow. - 
12 3 
— 
2 
— 
— 
„ „ var. problematica, d'Orb. 
- 2 - 
— 
— 
— 
— 
„ Cuvieri, Sow. - 
1 2 - 
1 
2 
3 
,, Lamarcki, Park. 
— — — 
1 
— 
— 
— 
„ sp. (square, smooth) -• 
- 2 - 
— 
- 
- 
— 
Lima granosa, Goldf. 
