PLATE XXVI. 



Fig. 



1. Turrilites Scheuchzerianus ; adult, with the mouth produced; from the Grey Chalk 



of Ventnor, Isle of Wight ; in my possession, p. 64. 



2. Turrilites Scheuchzerianus; a young shell, on which part of the produced mouth 



is preserved ; from the Grey Chalk of Ventnor, Isle of Wight ; in my possession, 

 p. 64. 



3. Turrilites Scheuchzerianus ? a very young shell, with the produced mouth com- 



pletely formed ; from the Grey Chalk of Ventnor, Isle of Wight ; in my posses- 

 sion, p. 64. 



4. 'ha, b, 6, la, b, and 8. Turrilites Morrisii ; five specimens of different ages; from 



the Chloritic Marl of Ventnor, Isle of Wight; in my possession, p. 65. 

 55, shows the base of the whorl of 5a. 

 7b, is the outline of the septum of la. 



9. Turrilites Bergeri ; a fragment, showing part of the outline of a septum ; from the 



Chloritic Marl of Ventnor, Isle of Wight ; in my possession, p. 65. 



10. Turrilites Bergeri; a fragment, from the Grey Chalk, near Lewes; in the British 



Museum, from the collection of Dr. Mantell, p. 65. 



11. Turrilites Bergeri; fragment of a young shell; from the Chalk with siliceous 



grains, Chardstock, Somersetshire ; in the collection of J. Morris, Esq., p. 65. 



12. a, b. Turrilites, species undetermined ; the last whorl of an adult shell, with the mouth 



produced ; from the Grey Chalk of Lewes ; in the British Museum, from the 

 collection of Dr. Mantell. 



13<z, b. Turrilites Bechei; from the Chalk with siliceous grains, near Lyme Regis; 

 part of the outline of a septum is seen on the second whorl ; presented to the 

 British Museum by the late Sir H. T. de la Beche, p. Q6. 



14. Turrilites Gravesianus ; outline of part of a septum. 



1 5. Turrilites tuberculatus ; outline of part of a septum. 



10. Turrilites tuberculatus ; outline of part of a septum; from the Chloritic Marl of 

 Bonchurch, Isle of Wight ; in the collection of S. Saxby, jun., Esq., p. 61. 



