196 SUPPLEMENT TO THE CRAG MOLLUSCA. 
to have been warm. Further, we have the following sixteen Cor. Crag genera not yet 
known to be living in the seas of Britain, of the North Atlantic, or of the arctic regions, viz. 
Panopea,' Pholadomya, Chama, Hinnites, Hrycinella, Scintilla, Nucinella, Lingula (?), 
Stigaretus, Pyramidella (?), Fossarus (?), Cancellaria (rejecting Admete), Cassidaria, Terebra, 
Pyrula, and Voluta, to which might be added asection of Plewrotoma, and but for the late 
dredgings in abyssmal waters, the genus Verticordia also. The presence of these genera 
in the Coralline Crag seem to me to impart a more southern aspect to its fauna than any 
analysis of the species themselves would do. 
There are a few forms both in the Coralline and in the Red Crag, the living 
analogues of which survive in seas so remote as to throw no light on the affinities 
of the faunas of those Crags. Of these in the Cor. Crag the little rato, which 
I had identified with the West Indian species Maugeriz, may be instanced. 
Mr. Jeffreys, however (in a letter), informed me that he thought the specimens in 
my collection (in the Brit. Mus.) might be stunted forms of /evis. I believe, however, 
that “. Maugeria is identical with the shell from the Cor. Crag figured by me under that 
name. I have compared many specimens of each without being able to detect a difference 
that might be called specific, or any more difference than may be observed among the 
specimens themselves, and I cannot consent to degrade my little Crag shell into the 
position of a variety, as it and the true /evis are found together at the same spot without 
intermediate forms. 
The characteristic shell of the newer part of the Red Crag, of the Fluvio-marine Crag, 
of the Chillesford bed, and of the Lower, Middle, and Upper Glacial deposits, Mucula 
Cobboldiz, is another of these instances ; the living analogues of this shell, of which there 
are two or three, being denizens of the North Pacific ; and although I have pointed out 
in the body of this ‘Supplement’ the characters which seem to me to distinguish Vucula 
Cobboldie specifically from all these allied species, yet it is very remarkable that its 
analogues should be several in number, and all of them confined, as far as yet is known, 
to so remote a sea. 
In 18388 Mr. Conrad published figures and descriptions of some Medial Tertiary 
fossils of the United States bearing a strong resemblance to Crag forms; and in a paper 
upon these, published in the ‘ Proceedings of the Geol. Soc.’ for the year 1843, Sir 
Chas. Lyell gives the names of several species that he considered to be identical with 
Crag, or, at least, with Huropean fossils. 
In the ‘ Geological Magazine ’ for April, 1865, vol. 1, is a communication by Dr. P. 
Carpenter upon the connection between the Crag and the recent Mollusca of the North 
Pacific, wherem he appears to consider the Crag fauna and the North Pacific fauna to 
have emanated from the north, the one diverging eastward and the other westward. He 
says at p. 1538, “ Not taking into account similar forms, no fewer than twenty-four species 
1 Panopea Norvegica does not properly belong to the genus Panopea, but perhaps to Panomya ; see 
p. 161 of this Supplement. 
