PLATE XXVI. 



Fig. 



1. TuRRiLiTKs ScHEUCHZERiANUS; adult, with the luouth 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 Veutnor, 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 AVight ; in my posses- 

 sion, p. 64. 



4. oa, 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. 

 5^, shows the base of the whorl of ha. 

 lb, 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«, 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. QQ. 



14 Turrilites Gravesianus; outline of part of a septum. 



15. 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 W^ight ; in the collection of S. Saxby, jun., Esq., p. 61. 



