180 SUPPLEMENT TO THE CRAG MOLLUSCA. 
PievRoToMA pYemmA, Phil. 
This is given with a note of interrogation by Mr. A. Bell in his paper on the “ English 
Crags,” p. 28. I have not been able to see the specimen. 
Piuvrotoma Icenorum, S. Wood. Supplement to Crag Moll., p. 35. 
This is said by Mr. A. Bell in his list of the “English Crags” to be identical with 
Pl. Hosiusii, Konen, but on comparing my specimen with the German Oligocene shell 
there appears to be considerable difference. The Crag shell has much coarser striz, and 
a very obtuse apex, while the second volution is smooth. The knobs on the Crag shell 
are much larger, and there is a second row of nodules near the suture, a peculiarity which 
I do not observe on the German shell. Zcenorwm also has a broader sinus and a shorter 
canal at the base than has the German shell. 
PLEUROTOMA OBLONGA, Rex, is given in Mr. Bell’s list of Red Crag shells, but with a 
query. Mr. Canham has sent to me a specimen from the Red Crag at Waldringfield, 
and I have also had one from Mr. Bell, both of which resemble in shape the species with 
this name, but they are in an imperfect condition, with the ornamentation obliterated, so 
that it would be hazardous to refer them under these circumstances, and as the specimens 
are, I have no doubt, only derivative in the Red Crag, I have not thought it worth while 
to have them figured. 
APORRHAIS PESPELICANI, Linné, var. Serresianus. Supplement to Crag Moll., p. 49, and 
Addendum Plate, fig. 6. 
CHENOPUS SERRESIANUS? (Mick.) Phil. En. Moll. Sic., vol. ii, p. 185, t. 26, fig. 6. 
Locality. Cor. Crag, near Orford. 
The above represents one of the specimens previously spoken of at p. 49 of this 
‘Supplement. This appears to me to correspond with the figure and description of 
the Mediterranean shell as given by Philippi. Our Cor. Crag specimens are very 
variable, some having the ornamental nodules, as in this case, small and numerous, while 
others have little more than half the number, and there are forms intermediate between 
the two. Though my specimen has not the digitiform processes perfect, I can see no 
