434 BKPoiix — 1867. 



regarded as a Diirypa. The margin of the posterior orifice lias two slight 

 indentations or notches, one on each side ; and Sars's statement that the margin 

 is entire was perhaps founded on imperfect specimens. C. suhfusifonnis rnay 

 be known from C. (/aclns not only by its much smaller size, but also by having 

 the greatest width' or diameter in the middle (instead of in the upper or ante- 

 rior part), and by the posterior or narrower part being abruptly curtailed. C. 

 gaclus is awl-shaped, and has a tapering extremity; C. suhfusifonnis is gibbous. 

 Whether C. aadus inhabits our seas is questionable. Montagu says*, " This is 

 a pelagic species, found in many parts of the British Channel, and is Imown to 

 mariners by the name of ' hake's tooth,' who frequently find it within sound- 

 ings, adhering to the log-line (as we are informed), but most likelj' to the 

 plumb-line." My specimens are from the collections of Dr. Turton and Mr. 

 George Humjihreys ; the latter dealt almost exclusively in exotic shells. Eaug 

 placed D. gadus in his genus Greseis, among the Ptcropoda ; but Philippi 

 rightly objected to such a classification, because the shells of all Pteropods are 

 closed at the smaller endf. 



The sixth and last addition to our molluscan fauna is 



Utriculus globosus, Lovcn 



{Ampliisphyra (jlohosa, Ind. Moll. Scand. p. 11). Two living specimens Avcre 

 dredged in St. Magnus Bay, with Ledapernula and Siphonodentaliiun Lofotense. 

 Its distribution, according to Professor Loven, extended from Finmark to 

 Bohusliiu in the south of Sweden; and through the kindness of the discoverer 

 and Professor Lilljcborg I have been enabled to compare the Shetland speci- 

 mens with those from the Scandinavian coasts. I mention this, because 

 (before I was thus favoured, and when I had only Lovcn's description to 

 consult) I mistook this species for another, which I have lately described 

 as U. ventrosus, from Skyc. 



2. Geocirapliicid disfrihution. — The accompanying listj of all the MoUusca 

 hitherto observed in Shetland and the adjacent seas will serve to show the 

 relations which exist between these and the MoUusca of the north and south 

 of Europe. The number of Shetland species is 3G3, of which 315 inhabit the 

 north and 245 the south of Europe. The total number of species of British 

 MoUusca, so far as I have yet worked out the subject, is 712. It may be 

 remarked what a scanty proportion the land and freshwater MoUusca of Shet- 

 land bear to those of Great Britain, viz. 23 species only out of 122. The marine 

 species, however, are 340 out of 590 — although the Zetlandic Nudibranchs 

 and Cuttles have not been weU 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. Terehra- 

 ieUa Spitzhcrgensis, Montaeiita tumidida, SipiJwnodentcdimn Lofotense, Cadidus 

 suhfusifornris, Rissoa proxima, Odostomia clavida, and Utriculus glohosus. Other 

 species, cither 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 

 Fecten Testce, Lima Sarsii, L. elliptica, Led(( prrnuJa, A.rinns ferruginosus, 

 Tsocardia cor, TeJlina halcmstina (one living specimen being fully an inch in 

 breadth), Panopea plicatn, Rissoa Jeffregsi, Aclis supmnitida, A. Waller!, 

 Odostomia minima, 0. (ximia, Eulima intermedia, Natica sordida, AporrJw'is 



* Test. Brit. i. p. 4flG. 



t I have now ascertained that BiplionododaUitm Lcfotcnsc, S. qiiinquangidurc, Cadii/iis 

 opHlum, C. f.v.hfitsifurmis, and Dischides hifissvs inhabit tlie Gulf of Naples. l.st January 



I This list will be published in the concluding Eeport next yeai". 



