ADDENDUM. 185 
‘Opostoma prntipticata, S. 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 £zssoa that 
seem to differ from recent species only in this character. See my remarks on Ressow 
semicostata, p. 72 of this ‘Supplement.’ 
Menrstuo Brivannica, 4. Bell. Addendum Plate, fig. 21. 
Menestuo Brivannica, 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 J/. 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 JZ. a/bula, 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 strize would most probably be still capable of detection, and as 
I can detect none I have retained it under the name Brzéannica given to it by Mr. A. 
Bell. 
Menestuo Jerrreysit, 4. Bell. 
Menestuo Jurrreysit, 4. Bell. English Crags, p. 24, Proc. Geol. Assoc., 1872. 
‘T'wo 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 Jeffreysit from the Red Crag is also given by Mr. Jeffreys at page 
AQA of Mr. Prestwich’s Red Crag paper with the remark that the shell was previously 
known to him as an undescribed Greenlandic species. 1 have compared these two Walton 
