MACROCEPHALITES MACROCEPHALUS. 



43 



Distribution. — This species occurs at Scarborough (13), Peterborough (5), 



Bedford (11), Castor (3), Thrapstou (4), Stilton (2), Rushden (2), Fairford (3), 



Appleby (3), Northants (2). It is, therefore, rather confined to the north, and 

 the specimens from the most southerly point, Fairford, are somewhat peculiar. 



Macrocephalites macrocephalus, Schloth 

 fig. 1 ; text-fig. 3. 



jp. Plate III, figs. 4, 5, 6; Plate IV, 



1757. Figure by Baier, Oryct. Noric. Suppl., pi. xii, fig. 8. 



1813. Ammonites macrocephalus, Schlotheim, Taschenbuch, p. 7U. 



1818. Nautilus tumidus, Reineoke, Maris Protogoei Naut. et Argon., p. 7-1, pi. 7, fig. 17. 



1820. Ammonites macrocephalus, Schlotheim. Petrefactenkunde, p. 70. 



1835. — terebratus, Phillips, Geol. Yorks., 2nd edition, p. 110. 



1846. — tumidus, d'Orbigny, Pal. Franc. Terr. Jurass., p. 469, pi. 171. 



Type. — Schlotheim having given no description of the species as distinct from 

 the genus, and Baier, to whom he refers as above, having also left the shell 



Fig. 3. — Copy of Baier's original figure of the Ammonite now named Macrocephalites 



epkalus. 



nameless and without description, we are thrown back on the figure he gives as 

 representing the shell called by Schlotheim Am. macrocephalus, which is here 

 reproduced (text-fig. 3). It is clearly the same form as was called by Reinecke 

 Nautilus tumidus, and duly described under that specific name by D'Orbigny. 

 This, therefore, must be taken as the type of Macrocephalites macrocephalus. 

 Schlotheim' s later remarks in the ' Petrefactenkunde ' relate only to the generic 

 characters and an enumeration of the varieties observed. 



