﻿PLATE XXXVIII. 



Fig. 



1- Trif/oiiia Ci/>iiba,Coni. (Mould). Portland Sand, Dorset. (Page 192.) 



Coll. Col. J. C. Mansel-Pleydell. 



2. „ I'xallala, Lye. Middle Neocomian formation, Norfolk. (Page 



184.) Coll. British Museum. 



3- „ Alina, Cont. Portland Limestone, Shotover Hill. (Page 



193.) See also PI. IX, fig. 2 ; there mentioned as 

 a variety of T. incurva. Coll. Museum, Oxon. 



4- „ comptn. Lye. Slate of Collyweston. Specimen unusually 



large, having the posteal terminal tubercle of eacii 

 costa much developed. See also PL XV, figs. 5, 

 6, 7. (Page 70.) Coll. S. Sharp, Esq. 



6- ,-, scapha, Ag. Middle Neocomian formation, Norfolk. (Page 



183.) Woodwardian Museum, Cambridge. 



7- „ Williamsoni, Lye. Kelloway Rock, Scarborough. See also 



PI. XVI, fig, 8. (Page 53.) My collection. 

 8, 9. „ Wiichelli, Lye. Fullers' Earth, Stroud. (Page 197.) Coll. 



E. Witchell, Esq. 

 10, II, \-2, \-2a. „ pidchella, Ag. Upper Lias, Lincoln. (Page 185.) My col- 

 lection. 



