Cephalopoda in Tate and Blake’s ‘ Yorkshire Lias.’ 275 
A. Bucklandi, Redcar (1 ex. with Arietites semicostatus) The peri- 
phery of the specimen is represented in Blake’s fig. 4B. 
AEgoceras pellati Dumortier sp. (p. 273). 
The fragment attributed to this species and figured in PI. VI., fig. 5, 
is in the Blake collection [B.M. No. C. 17880]. The specimen is repre- 
sented of about the natural size. It is labelled in Blake’s handwriting : 
‘ Bucklandi, Redcar, Am. Pellati, PI. B., fig. 5,’ the words ‘ cf. 
vellicatus,’ having been crossed out and the word ‘ Pellati ’ substituted. 
The ‘ Geological position ’ given by Blake is : ‘ Zone of A. Bucklandi, 
Redcar (2 ex.).’ 
AEgoceras (?) finitimum, n. sp. (p. 273). 
Blake states : ‘ I have only seen two examples of this in the Leckenby 
collection under the name finitimum, Bean MS., which I have adopted. 
The Blake collection does not contain an example of the species. 
AEgoceras^ (?) viticola Dumortier sp. (p. 274). 
Blake’s remark is ; ‘A single example in the Leckenby collection.’ 
Blake’s collection does not include an example. 
AEgoceras nigrum Blake (p. 274). 
The Blake collection [B.M. No. C. 17889] contains the holotype 
of this species. It is labelled in Blake’s handwriting : ‘ PI. B., fig. 6,’ 
the figure being of about the natural size. The specimen bears no 
locality label, but the ‘ Geological position ’ of the species given by 
Blake is only : ‘ Zone of A. bucklandi, Robin Hood’s Bay. With AEg. 
birchii (4 exs.).’ This, therefore, must be the horizon and locality of 
the type. His collection includes another example [B.M. No. C. 17890], 
19-5 mm. in diameter, labelled in Blake’s handwriting ; ‘ Am. niger 
R.H.B.’ 
AEgoceras birchii J. Sowerby sp. (p. 274). 
Blake records this species from Redcar and Robin Hood’s Bay, in 
Yorkshire, but his collection does not include a Yorkshire example of 
the species. 
AEgoceras scoresbyi Simpson sp. (p. 275). 
To this .species Blake refers one example in the Whitby Museum. 
His own collection does not include an example. 
AEgoceras planicosta J. Sowerby sp. (p. 275). 
Of the Yorkshire examples of this species in the Blake collection 
only two are localised. One [Brit. Mus. No. C. 19187], a small specimen, 
16-2 mm. in diameter, is labelled in Blake’s handwriting : ‘ Am. planic. 
Peak.’ Blake does not mention this locality for the species unless the 
term ‘ Robin Hood’s Bay ’ includes its southern boundary, ‘ Peak.’ 
The other example [Brit. Mus. No. C. 19186], an ammonite 32 mm. in 
diameter, is labelled in Blake’s handwriting : ‘ oxynotus. R. H. Bay. 
A. ziphus.’ This is doubtless the form which Blake alludes to in his 
remarks, which are as follows ; ‘ In some the outer whorls develop great 
tubercles, while the inner whorls are of the typical form ... When 
thus developed we have the A . ziphus of Zieten . . . ’ 
AEgoceras gagateum G. Young and J. Bird sp. (p. 275). 
The Blake collection includes the original of his PI. VI., fig. 8 [B.M. 
No. C. 17883]. It is fairly well represented, of about the natural size, 
in Blake’s figure. It is labelled in Blake’s handwriting : ‘PI. B., 
fig. 8.’ The ‘ Geological position ’ of the species given by Blake is : 
‘ Zone of A. oxynotus, of which it is highly characteristic. Robin 
1922 Aug.-Sept. 
