200 
NAUTILOIBEA. 
M. Dumortier figures (loc. cit. pi. viii. f. 4) a fragment from 
Crusol, which he incorrectly refers to astacoides : the sculpture and 
the larger size of the umbilicus show that it belongs to X. 
striatus. 
Horizon. Lower Lias ; Upper Lias. 
Localities. Lyme Regis, Dorsetshire ; Whitby, Yorkshire. 
Well represented in the Collection. Two of the specimens (Yo. 
C. 1380 and C. 1381) were presented by J. E. Lee, Esq., F.S.A., 
E.G.S. 
Nautilus semistriatus, d'Orbigny. 
1842. Nautilus semistriatus, d’Orbigny, Paleontologie Fran 9 ai.sc (Ter- 
rains Jurassiques), vol. i. p. 140, pi. xxvi. 
1845. Nautilus semistriatus, Murchison, Geology of the Neighbour- 
hood of Cheltenham, new ed. p. 91. 
1849. Nautilus semistriatus, Quenstedt, Die Cephalopoden, p. oO. 
1849. Nautilus semistriatus, d’Orbigny, Prodrome de Paleontologie 
Stratigraphique, vol. i. p. 245. 
1850. Nautilus semistriatus, Coquand and Dayle, Bull. Soc. Geol. de 
France, ser. ii. vol. vii. p. 235. 
1852. Nautilus semistriatus, Giebel, Fauna der Vorwelt, Band iii. 
Abth. i. p. 164. 
1853. Natdilus semistriatus, Studer, Geologie der Schweiz, Band ii. 
p. 36. 
1854. Nautilus semistriatus, Morris, Catalogue of British Fossils, 2nd 
ed. p. 307. 
1858. Nautilus semistriatus, Oppel, Die Juraformation Englands, 
Frankreichs und des siidwestlichen Deutschlands, p. 241. 
1858. Nautilus semistriatus, Ooster, Catalogue des Cdplialopodes Fos- 
siles des Alpes Suisses, pt. iii. p. 7. 
1868. Nautilus semistriatus, Peynes, Essai de Geologie et de Paleonto- 
logie Aveyronnaises, p. 69. 
1869. Nautilus semistriatus, Dumortier, Etudes Paleontologiques sui- 
tes Depots Jurassiques du Bassin du Rhone, pt. iii. p. 55. 
1871. Nautilus semistriatus, Phillips, Geology of Oxford and the Valley 
of the Thames, p. 131. 
1882. Nautilus semistriatus, htheridge, Quart. Journ. Geol. Soc. (Pro- 
ceedings — Anniversary Address), vol. xxxviii. p. 171. 
1884. Nautilus semistriatus, L. Mallada, Bol. Com. del Mapa Geol. de 
Espaha, vol. xi. Sinopsis de Fosiles de Espaha, p. 19. (Figured 
ibid. vol. V. 1878, pi. iii. f. 9.) 
1888. Nautilus semistriatus, Beeby Thompson, The Middle Lias of 
Northamptonshire, p. 54. 
S]p. Char. Shell much compressed, the periphery narrowly trim- 
