284 Cephalopoda in Tate and Blake’s ‘ Yorkshire Lias.’ 
the original of Blake’s figure, PI. VI., fig. 3, is labelled in Blake’s hand- 
writing : ‘ PI. A., fig. 3,’ a ‘ B ’ having been written in pencil over the 
1 A.' Blake’s figure 3 a represents the fossil of about natural size. If 
drawn from the same specimen, fig. 3B is somewhat ‘ improved ’ ; almost 
the whole of one side of the fossil is obscured by matrix. Blake gives 
the ‘ Geological position ’ of the species in Yorkshire as : ' Zone of A. 
Bucklandi, Redcar and Robin Hood’s Bay,’ but the figured example 
bears no locality label and may therefore have been either from Redcar, 
or from Robin Hood’s Bay. As Blake would probably mention first the 
locality of the figured example, this may be assumed to be ‘ Redcar,’ 
the matrix agreeing with the matrix of the original of PI. VI., fig. 4 
(Arietites semicostatus and TEgoceras pauli), also from the ‘ zone of A. 
Bucklandi ’ at Redcar. 
Arietites (?) macdonelli Portlock sp. (p. 290). 
Blake figured (PI. V., figs. 8a, 8b) two examples, which he referred 
to this species, and both are in the Blake collection. 
With respect to the original of Fig. 8a, the form of the anterior end 
of the original [B.M. No. C. 17874] is copied in the plate, but the rest 
of the figure is much restored. Not only are portions of the test wanting, 
but the periphery of the first third of the outer whorl is much weathered. 
Further the figure is reduced, the greatest diameter of the fossil being 
73 - 5 mm. That it is the figured example there can be no doubt ; it is 
labelled in Blake’s handwriting : ‘ armatus, Warter, Ammonites Mac- 
donelli,’ and ‘ PI. A., fig. 8a.’ 
The original of Fig. 8b [B.M. No. C. 17875] is partially embedded 
in matrix and is represented of about the natural size. It is labelled 
in Blake’s handwriting : ‘ PI. A., fig. 8b,’ and (? in the same hand- 
writing) : ‘ armatus, Nr. Warter.’ 
Arietites collenoti d’Orbigny sp. (p. 290). 
The Blake collection includes a specimen [B.M. No. C. 18114], 37 
mm. in diamater, labelled in Blake’s handwriting: ‘Am. tenellus 
L.L., R.H.B.’ Since Blake places the species tenellus as a synomym of 
Arietites collenoti, this specimen, though not specially mentioned, may 
be regarded as one of the specimens recognised by Blake as Arietites 
collenoti (d’Orbigny). 
There is another ammonite in the Blake collection [B.M. No. C. 
18116], 35‘2 mm. in diameter, labelled in Blake’s handwriting : ‘ oxy- 
notus, Robin H. Bay. Ammonites collenoti,’ that is most probably 
another of the specimens recorded by Blake. 
Arietites impendens G. Young and J. Bird sp. (p. 290). 
The Blake collection includes [B.M. No. C. 17936], the original of 
Blake’s PI. VI., fig. 7. The fossil is marked in Blake’s handwriting : 
‘ PI. B, fig. 7,’ and agrees well with the figure which represents the 
fossil of about two -thirds of the natural size, the greatest diameter of 
the specimen being 63 mm. The fossil bears no locality label, but since 
the only horizon and locality given by Blake for this species is : ‘ Zone 
of A . oxynotus, Robin Hood’s Bay,’ this must be the horizon and locality 
of the figured example. 
. 
WMf Amaltheus oxynotus Quenstedt sp. (p. 291) .] 
There is depicted in Blake’s PI. VI., fig. 10, a small Ammonite 
which does not appear to be referred to in the text of the work. In the 
Blake collection there was a small tray containing eight specimens 
[B.M. No. C. 18043-50], ranging in diameter from 27-6 to 9’6 mm. in 
diameter. One of these [B.M. No. C. 18044]^ 13' 5 mm. in diameter, 
seems, so far as can be judged from Blake’s very poor figure, to have been 
the original of that figure. The specimen is not labelled, but its mode 
Naturalist 
