PLATE XXV. 



Fig. 



1. Turrilites tuberculatus j from the Grey Chalk of Ringmer, Sussex; in the British 



Museum, from the collection of Dr. Mantell, p. 61. 



2. Turrilites tuberculatus, showing the produced mouth; from the Grey Chalk, near 



Lewes ; in the British Museum, from the collection of Dr. Mantell, p. 61. 



3. Turrilites tuberculatus ; a fragment, showing the position of the lobes of a septum 



on the outer side of a whorl ; from the Grey Chalk of Ventnor, Isle of Wight, in 

 my possession, p. 61. 



4. Turrilites tuberculatus ; a young specimen, from the Grey Chalk of Ventnor, Isle 



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



5. Turrilites Mantelli ; from the Grey Chalk, near Lewes ; part of the outline of a 



septum is shown on the upper whorl ; in the British Museum, from the collection 

 of Dr. Mantell, p. 63. 



6a, b. Turrilites Mantelli ; from the Grey Chalk, near Lewes ; an adult individual, 

 showing the produced mouth ; in the British Museum, from the collection of Dr. 

 Mantell, p. 63. 



la, b. Turrilites Gravesianus ; from the Grey Chalk, near Lewes ; the position of the 

 lobes of a septum is shown on the lower whorl of fig. la ; in the British Museum, 

 from the collection of Dr. Mantell, p. 62. 



