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Arkell.1956.Jurassic..

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PLATE 33<br />

TOARCIAN<br />

1. Pleydellia aalensis (Zieten), holotype after Zieten (1830, pi. xxviii, fig. 3). Lias<br />

of Aalen, Wiirttemberg. X 1 -o.<br />

2. Lytoceras (Pachylytoceras) jurense (Zieten), after Quenstedt (1885, pi. 47, fig. 2),<br />

copied from a drawing by Zieten. Probably from Uhrweiler, Alsace. X o-go.<br />

3. Hildoceras bifrons (Bruguiere), topotype after Arkell (1933, pi. xxxii, fig. 3).<br />

Whitby, Yorks. (Neotype was figured by Buckman, 1918, Type Am. ii,<br />

pi. cxiv.) Type species of the genus Hildoceras Hyatt, 1867. X i-o.<br />

4. Dactylioceras commune (Sowerby), lectotype now designated, Whitby, Yorks.<br />

The aperture is carved as a snake's head. (British Mus.). X i-o.<br />

5. Harpoceras falcifer (Sowerby), holotype, Ilminster, Somerset. (British Mus.)<br />

Type species of the genus Harpoceras Waagen, 1869. (Opinion 303.)<br />

Xi-o.<br />

6. Dactylioceras tenuicostatum (Young & Bird), chorotype after Arkell (1933,<br />

pi. xxxii, fig. 6). Whitby, Yorks. Xo-8.<br />

764<br />

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