386 G. C. Crick — Jurassic Cephalopoda — 



BELEMNOIBEA. 



Belemnites (Agricola), Lister. 

 Belemnites, sp. 



The collection contains only two fragments referable to this genus. 

 The one is 42 mm. in length, much abraded, and partly obscured by 

 matrix. The fragment appears to have been originally nearly cylin- 

 drical, but its dorsal surface has been considerably abraded, v/hilst 

 its ventral surface and portions of the sides are obscured by matrix. 

 A little below the middle of the specimen, its dorso-ventral diameter 

 is 13-5 mm. and its transverse diameter 14-0 mm. One end is 

 obliquely abraded and shows the presence of a ventral groove, from 

 which a fissure passes inwards to the apical line, which is here 

 nearer the ventral than the dorsal surface. The extent of the 

 groove cannot be seen, as the ventral surface is obscured by matrix. 



The other fragment is 15*5 mm. long and is divided longitudinally 

 so as to present a median section ; at the larger end the dorso-ventral 

 diameter is 8'5 mm., its transverse about 8'0 mm., whilst at the 

 smaller end the dorso-ventral diameter is Q'5 mm. and the transverse 

 about 8'0 mm. 



These fragments are probably referable to the species which 

 Clarke ^ and Moore ^ identified from W. Australia as Belemnites 

 canaliculatus, Schlotheim.^ Moore's figured specimen is in the Bath 

 Museum. 



Locality. — Champion Bay, Western Australia. 



NAUTILOIBEA. 

 Nautilus, Breynius. 



Several Mesozoic Nautili have been recorded from Australia, viz. 

 Nautilus sinuatus'l, J. Sowerby,* Nautilus semistriatus, d'Orbigny,^ 

 and a probably new species ^ — all from Western Australia ; and 

 Nautilus Hendersoni, R. Etheridge, fil.,'' from Queensland. 



The present collection contains only one specimen of Nautilus ; 

 this appears to belong to a new species, and is here described as 

 N. perornatus. 



Nautilus perornatus, sp. nov. (PI. XII. Figs, la, b, c.) 



1870. Nautilus semistriatus, C. Moore, "Australian Mesozoic Geology and 

 Palaeontology," Quart. Journ. Geol. Soc. vol. xxvi. pp. 230-232. (Not 

 of d'Orbigny.) 



Sp. char. — Shell moderately inflated, rapidly enlarging; greatest thickness near 

 the umbilical margin ; sides somewhat flattened, sloping towards the periphery ; 



* Quart. Journ. Geol. Soc. vol. xxiii. (1867), p. 9. 



2 Ibid. vol. xxvi. (1870), pp. 227, 230, and 232, pi. xvi. fig. 7. 



3 Petrefactenkunde, 1820, p. 49. 



* J. Sowerby, Min. Con. vol. ii. p. 213, pi. cxciv. 1818 ; W. B. Clarke, Quart. 

 Journ. Geol. Soc. vol. xxiii. (1867), p. 8. 



5 A. d'Orbigny, Pal. Fran9. Terr. Jiu-. vol. i. 1842, p. 149, pi. xxvi. ; C. Moore, 

 Quart. Journ. Geol. Soc. vol. xxvi. (1870), pp. 230-232. 



6 W. B. Clarke, Quart. Journ. Geol. Soc. vol. xxiii. (1867), p. 9. 



■^ E. Etheridge, fit., in Jack and Etheridge, Geology and Palaeontology of Queens- 

 land and New Guinea, 1892, p. 502. 



