part 1] OF THE SIIALES-WITH-' BEEF.' 71 



Moreover, A. miserabilis is an early form typically occurring in 

 the ' Schneller ' Limestones of Quenstedt's Lias a (subzone of 

 Arietites multicostatas in E. Haug 1 — Neues Jahrb. vol. ii, 

 1887, p. 101), and below the Pentacrinite-Bed, which is probably 

 the alcinoe horizon of this paper. In Yorkshire, Ammonites 

 miserabilis occurs in the same blocks with Arnioceras acuti- 

 carinatum (Simpson), and the latter is a characteristic fossil of 

 the scipionianum beds near Broadford in Skye. On the other 

 hand, A. flavum, A. nigrum, A. semicosfatum, A. anageneticum 

 S. Buckman, A. douvillei ? (Bayle), A. difforme (Blake non 

 Emmrich), and other comparable species of this ' Epamioceras ' 

 type may be later even than the hartmanni subzone : for, to 

 judge by specimens in the British Museum (C 2912 & 62370), 

 they are associated with an early form of Xiplieroceras [cf. 

 J5T. capricornoides Quenstedt 2 ] suggestive of the bircM zone. 

 Unfortunately, the Dorset examples of this group, occurring in 

 what appears to be a nodular limestone, with the shells well 

 preserved in yellowish or greenish calcite, have not yet been found 

 in situ. It is, therefore, considered inadvisable to identify any of 

 the crushed smooth forms of beds 71 & 72 with the true Arnio- 

 ceras semicostatum and A. flavum occurring in limestone. 



Little need be said about the Arnioceras of the alcinoe horizon 

 and the underlying Agassiceras beds. No satisfactory specimen 

 of the Gloucestershire Arnioceras bodleyi (J. Buckman) was 

 found, and, from a comparison of Dumortier's 3 pi. xxx, figs. 1 & 2 

 {A. geometriciis from the ' oxynotum ' zone) with pi. vii, fig. 6 

 {A. geometriciis from the bucklandi zone), it will be seen that 

 similar types of Arnioceras, in the Rhone Basin also, are widely 

 separated stratigraphically. Nearly all the specimens are badly 

 crushed ; moreover, Arnioceras anomaliferum Fucini, to which 

 some of the specimens are compared, itself includes a doubtfid 

 series of forms, and A. cf. speciosum Fucini, also provisionally 

 included in the list, may or may not be identical with Buckman's 

 A. fortunatum, which Fucini considers to be a synonym of his 

 Italian species. 4 



In the lowest bed, Table Ledge (53), a rather distinctive new 

 but generally crushed form, is fairly common. It resembles the 

 species wrongly included by Quenstedt (' Ammoniten des Schwab- 

 ischen Jura ' pi. xl, fig. 5) in Helil's Ammonites kridion ; but 

 the ribs are even less distinct, especially on the outer portion of 

 the sides. Hyatt 5 included Quenstedt's figure in his Arnioceras 

 kridioides, but wrongly, as F. Warmer 6 pointed out. 



1 Haug fixed the type, but confused with it A. nigrum Blake. 



2 'Ammoniten des Schwabischen Jura' 1883, pi. xvii, fig. 11. 



3 ' Etudes Paleontologiques . . . Bassin du Rhone ' vol. ii, 1867. 



4 ' Appunti di Ammonitologia ' Boll. Ace. Gioenia di Sci. Nat. Catania, Fasc. 

 47 (1919) 1920, p. 8. 



5 ' Genesis of the Arietidse ' 1889, p. 171. 



6 ' Beitriige zur Kenntnis der Tieferen Zonen des Unteren Lias in den 

 Nordostlichen Alpen ' pt. vii, Beitr. Pal. (Est.-Ung. vol. ix (1894) p. 5, 

 footnote 3. 



