llic land and freshwater INTollusca have for some time past 
been assiduously worked l)y the Messrs. Bridgman, and ilr. Reeve, 
und tlie fact tliat the former gentlemen are about to publish in our 
1 r.insactions the result of their work, induces me to supple- 
ment it by giving the names of ninety-one marine forms I have 
collected, for the information of any who may feel an interest in 
the subject. I do not offer the list as anything but a provisional 
one, but I shall bo ghul if it is the means of calling attention to a 
somewhat neglected branch of incpiiry, and I shall feel exceed- 
ingly obliged if any, into whose hands it may come, who may be 
wdling to co-operate with mo in making it more complete, will 
kindly furnish me with any information bearing upon the .subject. 
I gladly acknowledge the courte.sy of i^lr. Gwyn Jeffreys, who 
has very kindly communicated to me the result of some dredging 
operations conducted, during last summer, by Capt. Galver” of 
II.jNI.S. “Porcupine,” in Lynn Well, the deepest part of the Wash. 
The species found by him which I have not myself met with, are 
marked in the list with a “ J.” 
I have also to thank Mr. J. ]>. Bridgman for allowing me to 
inspect his specimens, as also Mr. Reeve, of the Norwich Museum, 
two shells given on :\fr. ]>ridgman’s authority are distingui.shed 
by having “ B ” against their names. 
INfr. JNEunford, in the work before alluded to, mentions, in addi- 
tion to the species given in my list, Dental i urn enfatis', Chiton 
marijinatus, Trochu-i mar/m, and Aporrhais pcs-pelicani. 
There are also several other shells in our i\Iuseum, labelled 
“ Norfolk Coast,” but in Mr. Reeve’s opinion, there is considerable 
doubt as to their authenticity. 
It may, perhaps, be interesting to point out, that while sixteen out 
of the ninety-one species given below hav'e a range exclusively to 
the north of our shores, those which range southwards only are 
almost entirely absent. During the earlier part of the crag period, 
we had living in what is now the Eastern Counties of England^ 
a Mediterranean-like tauna, and again subsequentlv to the 
arctic conditions accompanying the formation of the "contorted 
drift of the Cromer cliffs we had, as shewn by the sand and 
gravel beds of the middle glacial period, a iMolluscan fauna 
whose aspect is preponderatingly southern, but as far as ray 
list goes, the testacea now living here are, with one apparent 
