﻿ADDENDUM. 



185 



Odostoma dentiplicata, fit. Wood. Addendum Plate, fig. 18. 

 Locality. Cor. Crag, Sutton. 



A single specimen of this genus has lately been found by myself which, in all 

 respects, except in its denticulated outer lip, corresponds with Od.plicata, 'Supplement,' 

 Tab. IV, fig. 22. Dr. Speyer has figured a shell under the name of Odontostoma plicatum 

 (' Tert. Conch. Cassel,' Tab. XXV, fig- 3), which is probably the same as my species. 

 It shows similar denticulations. 



There are two or three other Crag shells in this genus, and in the genus Bissoa that 

 seem to differ from recent species only in this character. See my remarks on Bissoa 

 semicostata, p. 72 of this 'Supplement.' 



Menestho Britannica, A. Bell. Addendum Plate, fig. 21. 



Menestho Britannica, A. Bell. "English Crags," Proc. Geol. Assoc., 1872, p. 18. 



Locality. Cor. Crag, Sutton. 



The above figure represents the original shell forwarded to me by Mr. Robert Bell 

 upon which the name of M. Britannica was introduced by his brother into his list of 

 English Crag shells. The specimen agrees (especially in the sudden tapering off of the 

 three upper whorls) with the description of M. albula, given in the 2nd edit, of Gould's 

 ' Invertebrata of Massachusetts,' p. 333, except in the absence of fine striae with which the 

 American shell is said to be covered. Our present fossil is so well preserved that if it had 

 been striated traces of the striae would most probably be still capable of detection, and as 

 I can detect none I have retained it under the name Britannica given to it by Mr. A. 

 Bell. 



Menestho Jeffreysii, A. Bell. 



Menestho Jeffreysii, A. Bell. English Crags, p. 24, Proc. Geol. Assoc., 1872. 



Two specimens from the Red Crag of Walton Naze have been sent to me by Mr. 

 Robert Bell with the above name attached, and in his letter is the following remark : 

 " This little shell was first identified by Mr. Jeffreys as a distinct species, and afterwards 

 compared again by himself and my brother, and recognised as identical with some Arctic 

 specimens he possesses. The name was given with his (Mr. Jeffreys') concurrence and 

 permission." 



The name Menestho Jeffreysii from the Red Crag is also given by Mr. Jeffreys at page 

 494 of Mr. Prestwich's Red Crag paper with the remark that the shell was previously 

 known to him as an undescribed Greenlandic species. I have compared these two Walton 



