252 Mr. J. Gwyn Jeffreys on Dredging 
the plumb-line.’ My specimens are from the collections of 
Dr. Turton and Mr. George Humphreys; the latter dealt almost 
exclusively in exotic shells. Rang placed D. gadus in his genus 
Creseis, among the Pteropoda; but Philippi rightly objected to 
such a classification, because the shells of all Pteropods are closed 
at the smaller end. 
The sixth and last addition to our molluscan fauna is 
Utriculus globosus, Lovén 
(Amphisphyra globosa, Ind. Moll. Scand. p. 11). Two living 
specimens were dredged in St. Magnus Bay, with Leda pernula 
and Siphonodentalium Lofotense. Its original distribution ex- 
tended from Finmark to Bohuslan in the south of Sweden ; and 
through the kindness of the discoverer and Professor Lilljeborg 
I have been enabled to compare the Shetland specimens with 
those from the Scandinavian coasts. I mention this, because 
(before I was thus favoured, and when I had only Lovén’s de- 
scription to consult) I mistook this species for another, which I 
have lately described as U. ventrosus, from Skye. 
2. Geographical distribution—The accompanying list* of all 
the Mollusca hitherto observed in Shetland and the adjacent 
seas will serve to show the relations which exist between these 
and the Mollusca of the north and south of Europe. The 
number of Shetland species is 363, of which 315 inhabit the 
north and 245 the south of Europe. The total number of the 
British Mollusca, so far as I have yet worked out the subject, 
is 712. It may be remarked what a scanty proportion the 
land and freshwater Mollusca of Shetland bear to those of 
Great Britain, viz. 23 only out of 122. The marine species, 
however, are 338 out of 590—although the Zetlandic Nudi- 
branchs and Cuttles have not been well examined, and, of the 
former, 28 only out of 110 have been as yet observed. 
_ Some species are now for the first time recorded as Zetlandic, 
e.g. Terebratella Spitzbergensis, Montacuta tumidula, Siphono- 
dentalium Lofotense, Cadulus subfusiformis, Rissoa proxima, Odo- 
stomia clavula, and Utriculus globosus. Other species, either 
rare or local, which I had previously dredged on the eastern and 
northern coasts, were found this year on the western coast also. 
Such are Pecten Teste, Lima Sarsii, L. elliptica, Leda pernula, 
Axinus ferruginosus, Isocardia cor, Tellina balaustina (one living 
specimen being fully an inch in breadth), Panopea plicata, 
Rissoa Jeffreysi, Aclis supranitida, A. Walleri, Odostomia minima, 
O. eximia, Eulima intermedia, Natica sordida, Aporrhais Macan- 
dree, Cerithiopsis costulata, Buccinum Humphreysianum, Colum- 
* This list will be published in the Reports of the British Association. 
