G. C. Crick — On Acanthoteuihis speeiosa. 



travei'sed by sevei-al obscure longitudinal grooves. This possibly 

 represents a portion of the mantle-cavity, for into its posterior part 

 opens the duct of the ink-bag (d). The latter is not filled with 

 ink; the posterior portion, i.e. the portion below the dotted line d, 

 is hollow and was evidently the " reservoir," while the anterior 

 portion, i.e. the part above the dotted line d, has a sponge-like 

 structure and is doubtless the remains of the " pigment-gland." 

 There are no indications of a phragmocone or of an internal shell 

 of any description. 



Belemnoteuthis antiqua, Pearce. 



a, arms ■with their booklets ; o, remains of the head, with eye ; m, mantle, 

 with indications of lateral fins; i, ink-hag, covered by the pallial 

 integ'ument ; ph, remains of the phragmocone and of the rudimentary 

 guard. 



Now the arms of Belemnoteuthis'^ irom. the Oxford Clay of Christian 

 Malford, Wilts, are furnished with hooks similar to those of Acantho- 

 teuthis ; and from an examination of one^ of Miinster's specimens, 

 in which small booklets were associated with a phragmocone, 



1 J. Channing Pearce, in Proc. Geol. Soc, vol. iii, 1841-2, p. 593. See also 

 Professor Owen, "A Description of certain Belemnites found, with a great portion 

 of their soft parts, in the Oxford Clay, at Christian Malford, in Wiltshire": Phil. 

 Trans. 1844, pp. 65-85. J. C. Pearce, " On the Fossil Cephalopoda constituting the 

 genus Belemnoteuthis, Pearce " : Loudon Geol. Journ. 1846, p. 75. W. Cunnington, 

 "On the Fossil Cephalopoda constituting the genus Belemnoteuthis, Pearce": 

 London Geol. Journ., May, 1847, p. 95. G. A. Mantell, "Observations on 

 some Belemnites and other Fossil Remains of Cephalopoda in the Oxford Clay 

 near Trowbridge, Wiltshire" : Phil. Trans. 1848, pp. 171-181. G. A. ManteU, 

 "Supplementary Observations, etc." : Phil. Trans. 1850, pp. 393-8. 



* Described in Neues Jahrbuch, 1836, p. 583. 



