80 DR. L. F. SPATH ON THE AMMONITES [vol. lxxix, 



stated that his S. angustisulcata occurred in the same block with 

 Arietites semilcevis (Hauer), which (according to Oppel) is an 

 Arietid of the tuberculatus zone, and, indeed, is grouped with 

 species of Amioceras by Geyer. Oxynoticeras oxynotus, however, 

 also occurs in the same block with Arietites semilcsvis, and both 

 are associated (as, for instance, at Station IV, position No. 5) 

 with Deroceras bispinatum (Geyer) and Sclilotheimia geyeri 

 Hyatt ( = $. lacunata Geyer non J. Buckman), also of the 

 oxynotus zone. The Sclilotheimia of the mixed Hierlatz deposit, 

 then, cannot be accurately dated. Similarly in the Ligurian 

 Apennines (Spezia), where numerous species of Sclilotheimia occur 

 in the lower beds with limonitic ammonites (megastoma to 

 rotiforme zones), only S. boucaultiana and ' Sclilotheimia sp. 

 indet., cf. geyeri Hyatt ' have been found in the upper shales 

 with abundant Amioceras. 1 When refiguring ' A. sulcatus ' in 

 the Palseontologia Universalis, Mr. S. S. Buckman pointed out 

 that '■sulcatus '-like forms had been mistaken for true Schlotlieimia 

 of the angulata-group, and he suggested that 



' the record for sulcatus and allies should be Lower Lias, Sinemurian, 

 zone of Amioceras semicostatum, neighbourhood of Cheltenham, in same bed 

 with A. bodleyi.' (1904, p. 39a & pi. xxxix.) 



Various Gloucestershire species of Sulciferites in the Tomes 

 Collection (Natural History Museum) are marked ' with A. birchV 

 (including the specimen on which the genus is based) or ' with 

 A. brooki ' ; but, as already mentioned, these Gloucestershire 

 ' brooki ' fragments do not agree with the true Charmouth brooki. 



Amioceras comparable to J. Buckman's A. bodleyi occur at 

 Charmouth in the alcinoe bed (70c), and Amioceras cf. nodulosum 

 (J. Buckman), the horizon of which was considered by Mr. S. S, 

 Buckman 2 to be ' presumably the same as that of A. bodleyi, 

 namely the semicostatum-zone,' 1 occurs in beds 70 h and 72 e & f, 

 wherefore the Sulciferites here referred to ' Ammonites sulcatus ' 

 \_S. sulcifer\ despite their crushed condition, may be assigned to 

 the Gloucestershire species. 



The genus Sulciferites, at Charmouth, seems to be restricted to 

 a portion of bed 73 (that is, the 6 feet of shales below ' Little 

 Ledge'). S. sulcifer is the latest species, ranging from bed 73m 

 to 73 p ; S. cf . angustisulcatus (Geyer) Tillmann sp. 3 is the 

 earliest, namely in beds 73 f to 73 h. S. cf. dumortieri (Fucini) 4 

 {z=. A. lacunatus Dumortier 5 non J. Buckman) occupies an inter- 

 mediate position (73 j— 73 m), as it is also intermediate between 



1 A. Fucini, ' Sopra gli Scisti Lionati del Lias Inferiore dei Dintorni di 

 Spezia' Atti Soc. Tosc. Sci. Nat. Pisa, Mem. vol. xxh (1906) p. 130. 



2 Paige ontologia Universalis, 1905, p. 77a & pi. lxxvii. 



3 ' Die Fauna des Unteren & Mittleren Lias in Nord & Mittel-Peru ' 

 Neues Jahrb. Beilage-Band xli (1917) p. 670 & pi. xxi, fig. 2. 



4 ' Cefalopodi Liassici del Monte di Cetona ' pt. iii, Pal. Ital. vol. ix (1903) 

 pi. xxiv (xxxv), fig. 9. 



5 ' Etudes Paleontologiques sur les Depots Jurassiques du Bassin du 

 Rhone ' vol. ii (1867) p. 120 & pi. xxi, figs. 18-20. 



