348 G. C. Crick—Two Chalk Cephalopods. 
cannot be seen; possibly the whole of this fragment was occupied by 
the body-chamber. 
The specimen greatly resembles the large example of Heteroceras 
reussianum (d’Orbigny) from. the ‘Scaphiten-Plainer’ near Oerling- 
hausen, in the Teutoburger Wald, N.W. Germany, figured by Schliiter,’ 
who states (op. cit., p. 109) that this fossil is one of the most 
characteristic fossils of the ‘Scaphiten-Pliiner’. Although there are 
only obscure indications of the periodical spiny ribs such as are 
represented in Schliiter’s figure, the fossil otherwise so closely 
resembles that figure, that it is here referred to the same species. 
From England? this species has been recorded from the Chalk Rock 
(zone of Holaster planus) of Bedfordshire (Luton Railway Cutting,* 
and near Dunstable *); Hertfordshire (Hitchin ;° Preston, near 
Hitchin ;* Boxmoor, near Hemel Hempstead ;7 and Clothall, south- 
east of Hitchin *); Berkshire ° (Cuckhamsley and Basildon 1) ; 
Oxfordshire (Aston Hill, near Aston Rowant;’* and doubtfully from 
Chinnor Hill’*); from the zone of Holaster planus in Buckingham- 
shire *; from the same zone at Dover’®; and from the same horizon i im 
Hampshire. mA 
EXPLANATION OF PLATE XXYVII. 
Pachydiscus farmeryi, G. C. Crick. 
Fic. 1. Lateral aspect of the type-specimen ; the finer peripheral ribs are shown on | 
the right-hand side of the figure. Turonian, zone of Holaster planus : 
Boswell, near Louth, Lincolnshire. Original in the British Museum 
(N atural History), register No. C.12,220. About four-fifths nat. size. 
,, 2. Peripheral aspect of the same, showing the pairs of elongated nodes at 
intervals on the peripheral area ; the finer transverse lines between 
succeeding pairs of nodes are visible in the upper part of the figure. 
About four-fifths nat. size. 
Heteroceras reussianum (d’ Orbigny). 
», 3. Small block exhibiting the terminal hook, and (at a) the impression of 
a small portion of the turreted part, of a specimen. ‘Turonian, zone of 
Holaster planus: North Ormsby, Lincolnshire. Original in the British 
Museum (Natural History), register No. C.12,118. About two-thirds 
nat. size. 
' C. Schhiter, Puleontographica, Bd. xxi, Lief. v, 1872, pl. xxxii, fig. 19. 
2 For a of foreign localities, see H. Woods, Quart. Journ. Geol. Soc. » vol. lit 
(1896), p- 
2 dale Wad Oe Ohy jo (Os Ne 5 . Jukes-Browne, Cretaceous Rocks of Britain 
(Mem. Geol. Surv.), vol. 1, Tie Upper Chalk of England, 1904, p. 228. 
4 H. Woods, op. cit., p. 75. A. J. Jukes-Browne, op. cit., p. 228. 
> H. Woods, op. cit., p. 75. 
6 A. J. Jukes- Browne, op. cit., p. 228. 
7 Jbid., p. 228. : Thia., p. 228. 9 Ibid, p. 470. 
ON ale Woods, op. cit., p. 75. 
1 ©. P. Chatwin & T. I vithers, Proc. Geol. Assoc., vol. xx, pt. v, March, 1908, 
407. 
Pie A. J. Jukes-Browne & H. J. Osborne White, Geology of the Country around 
Henley-on-Thames, etc., 1908 (Mem. Geol. Sury. England and Wales, expl. of 
sheet 254), p. 54. ‘ 
13 A. J. Jukes-Browne, op. cit., p. 213. 
14 Ibid., p. 470. 
15 A. W. Rowe, Proc. Geol. Assoc., vol. xvi, pt. vi, February, 1900, p. 366. 
16 A. J. Jukes-Browne, op. cit., p. 65. 
eS ee 
