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 glohosus, Loven 



{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 Finraark 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 Loven'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 Testa, Lima Sarsii, L. elliptica, Leda pernula, 

 Axinus ferruginosus, Isocardia cor, Tellina balaustina (one living 

 specimen being fully an inch in breadth), Panopea plicata, 

 Rissoa Jeffrey si, Aclis supranitida, A. Walleri, Odostomia minima, 

 O. eximia, Eulima intermedia, Natica sordida, Aporrhais Macan- 

 drecE, Cerithiopsis costulata, Buccinum Humphrey sianum, Colum- 



* This list will be published iu the Reports of the British Association. 



