Cephalopoda in Tate and Blake's ‘ Yorkshire Lias.' 285 
of preservation agrees perfectly with that of the largest specimen in the 
tray [B.M. No. C. 18043], and this is labelled in Blake’s handwriting : 
‘ oxynotus, Cheltenham, Ammonite oxynotus.’ Blake makes no reference 
to the figure in his description of ‘ Amaltheus oxynotus ’ (p. 291), so that 
it may be that after the specimen was figured, Blake found out that it 
was not a Yorkshire specimen, so made no reference to it in the body of 
the work. 
Amaltheus simpsoni Bean MS. in Simpson sp. (p. 291). 
An unlabelled specimen in the Blake collection [B.M. No. C. 17903], 
with a slightly imperfect periphery, is obviously the original of Blake’s 
PI. VIII., fig. 4, the figure representing the specimen as having a perfect 
periphery and of reduced size, the greatest diameter of the fossil being 
90 mm. The aspect of the anterior part of the fossil at once serves to 
identify the specimen. The ‘Geological position’ of this species given 
by Blake is only : ‘ Zone of A. oxynotus, Robin Hood’s Bay,’ so that, 
although the specimen bears no locality label, this must be its horizon 
and locality. 
Amaltheus trivialis Simpson sp. (p. 292). 
Blake figured (PI. V., figs. 6a, b, c, d) four examples which he referred 
to this species. In the Blake collection was a small tray containing 
seven specimens, accompanied by a pencil label in Blake’s handwriting : 
‘A. trivialis Jamesoni, R.H.B.’ [i.e., Robin Hood’s Bay ] . One of 
these [B.M. No. C. 17891] was labelled in Blake’s handwriting : ‘ PL 
A., fig. 6a,’ and undoubtedly is the original of his PI. V., fig. 6a (nat. 
size), but it bore no separate locality label. Still, there can be no doubt 
that the general label was intended to apply to all the specimens, so that 
the ‘ Geological position ’ of the fossil must be regarded as ‘ Zone of 
A. jamesoni, Robin Hood’s Bay.’ 
Amaltheus solitarius Simpson sp. (p. 295). 
We have not been able to recognise the figured example in the Blake 
collection. The collection contains two examples. Of these the first 
[B.M. No. C. 18121] is labelled in Blake’s handwriting : ‘ spinatus, 
Eston, Am. solitarius ? ? (young) ’ ; it is 26-4 mm. in diameter. A 
second [B.M. No. C. 18122]., 30-2 mm. in diameter, is unnamed, but was 
probably regarded as the same species. It is labelled in Blake’s hand- 
writing : ‘A. spinatus beds, Hawsker.’ 
Amaltheus (?) ferrugineus Simpson non Oppel sp. (p. 296). 
The original of Blake’s PI. VII., fig. 5, is in the Blake collection 
[B.M. No. C. 17940]. The fossil which is exposed on the surface of a 
rock-fragment is labelled in Blake’s handwriting : ‘ PI. C., fig. 5,’ and 
agrees .quite well with his figure, which represents the fossil of about 
the natural size, the apertural portion being very imperfect. The 
specimen bears no locality label. The ‘Geological position ’ of the 
species as given by Blake is : ‘ Zone of A. margaritatus Staithes (1 ex.). 
Zone of A. spinatus Hawsker, Eston, Upleatham, etc.’ The horizon and 
locality of the specimen is, therefore, somewhat uncertain. The matrix 
of the specimen, however, so closely resembles that of some ammonites 
in the Blake collection, marked in Blake’s handwriting: ‘Am. margari- 
tatus, Staithes,’ that there is great probability that the figured example 
is the single specimen noted by Blake from the ‘ zone of A. margaritatus 
Staithes ’ ; on the other hand, it is quite different from that of a specimen 
[No. C. 1 7941] in the Blake collection labelled in his handwriting : 
' Am. spinatus beds. Hawsker,’ or of a third specimen [No. C. 18105] 
in the same collection and labelled in the same handwriting : ‘ spinatus. 
Hawkser. A. ferrugineus.’ 
Phylloceras loscombi J. Sowerby sp. (p. 296). 
The Blake collection contains a specimen [B.M. No. C. 18115], 
1922 Aug.-Sept. 
