270 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



been recognised as generically distinct therefrom and referable to the 

 genus Belemnoteuthis. All the Oxfordian forms known to the present 

 writer that exhibit booklets have booklets with pointed proximal 

 ends, and are referable to the latter genus ; they arc not therefore 

 considered in the pr(;sent paper. The genus Belemnoteuthis certainly 

 possessed toi uncinated arms, as is well shown by the example of 

 Belemnoteuthis antiqua in the British Museum collection [B.M. 

 No. 25,966],' that has been figured by Mantell- and others. This 

 specimen also exhibits remains of the fleshy portion of the arms. 



Of the remains of uncinated-armed Cephalopods from the Lias, the 

 British Museum collection contains seventeen examples, all from the 

 Lias in the neighbourhood of Lyme Regis and of Cliarmouth in Dorset. 

 Each specimen exhibits a number of uncinated arms ttssociatcd usually 

 with an ink-bag, sometimes also with nacreous matter, and in two 

 instances also with the guard or rostrum. In all these specimens the 

 booklets have thickened proximal ends, but in no case are there traces 

 of the fleshy part of the arms. The two examples in which the remains 

 of the animal are associated with the guard are the specimens figured 

 as Belemnites Bruguierianus (pi. i, figs. 1, \a) and B. elongatus (pi. i, 

 figs. 2, 2a) respectively by Professor Huxley,^ who described and gave 

 several drawings of the booklets of the arms (pi. i, figs. 1«, 2a, 5, 5a). 

 Since in both these examples, in which remains of the arms have been 

 preserved associated with the guard, the booklets had peculiar 

 thickened proximal ends, it is much more than probable that all the 

 other examples of arms bearing similar booklets that are associated 

 with an ink-bag and portions of nacreous matter belonged to Belemnites, 

 the guards having become detached, the nacreous matter that is 

 present having formed part of the nacreous pro-ostracum. 



It must, however, be mentioned that Professor James Buckman 

 described from the Lower Lias shales between Charinouth and Lyme 

 Regis a specimen which he referred to the genus Belemiioteuthis 

 {B. Montejiorei), but the present writer has already elsewhere given 

 his reasons for believing this fossil to be the remains of a Belemnite.* 



Again, Professor Dr. 0. JaekeP has described from the soft dark 

 clays of the Lower Lias of Lyme Regis a specimen which he refers 

 to the genus Acanthoteuthis. The description was not accompanied 

 by a figure, but thanks to the kindness of Dr. Jaekel and of the 

 late Professor Dr. K. A. v. Zittel, to whom Dr. Jaekel had sent the 



1 The numbers in square brackets refer to the register numbers in the British Museum j 

 collection. I 



- G. A. Mantell: "Petrifications and their teachings," 1851, p. 459, lign. 100. 

 G. A. Mantell: "Medals of Creation," 2nd ed., vol. ii (1854), p. 460, 

 lign. 145. J. Prestwich: "Geology," vol. ii (1888), p. 218, f. 116. Oxford , 

 Clay : Christian Malford, Wiltshire. j 



3 T. H. Huxley: Mem. Geol. Surv. United Kingdom, Figures and Descriptions of | 

 British Organic Remains, Mon. ii, "On the Structure of the Belemnitidae," 

 etc., 1864. 



< G. C. Crick : Proc. Malac. Soc, vol. v, pt. 1 (April, 1902), pp. 13-16, pi. i. 



* 0. Jaekel: Sitz.-Ber. Gesell. naturf. Freuude, Berlin, Jahrg. 1890, pp. 88-92. 



