ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 247 
Summary. 
Zleld| 
aiag| oid Remarks. 
3/5 /3 ge 
N\A |\nm A 
MaRineE. 
Brachiopoda ........0+.e0. 6} 6 4 8 
Wonchiterd, 2.2.0... ee 126|110) 107) 167 
Solenoconchia ............ 4) 4) 3) 5 
Gastropoda .....eeseeeees 223/188)140| 359| The last figure includes 111 
Nudibranchs. 
| 
Pteropoda ....:eseere-sses 3| 2) 8} 8|The number of marine species 
Cephalopoda ......... .....{ 6} 5) 8) 12] in Lovén’s ‘Index’ of Scandi- 
——|—_|— navian mollusca is 345, in- 
368/315 260| 554| cluding 40 Nudibranchs. 
LAND AND FRESHWATER. 
Wonchiferas. 0.650226 tee oss 2) 2) 2) 16 
Gastropoda .....+.++.+4+- 22| 22) 20} 109 
392|339|282| 678 
Obs. The Shetland Nudibranchs and Cephalopods have not been sufficiently 
investigated. Lovén’s ‘Index’ and a further list of Swedish Nudibranchs 
which he lately sent me contain 60 species of that order, out of which 25 
only have been identified as Zetlandic. He also gives 9 species of Cephalo- 
pods, of which 5 only are Zetlandic. The southern distribution of our Nu- 
dibranchs is very little known. For the preparation of the present list of 
Nudibranchs I am in a great measure indebted to the late Mr. Alder and to 
Mr. Norman. Forty-eight species of mollusca (marked +) have been discovered 
in the Shetland seas since the publication of Forbes & Hanley’s ‘ History of 
British Mollusca and their Shells.’ 
Shetland Final Dredging Report.—Part Il. On the Crustacea, Tuni- 
cata, Polyzoa, Echinodermata, Actinozoa, Hydrozoa, and Porifera. 
By the Rev. Atrrep Merrie Norman, M.A. 
Tux especial object with which the Shetland dredging was recently under- 
taken, under the auspices of the British Association, was the examination of 
the fauna of the deep water which surrounds that most northern group of 
our islands. The abyss of the sea there approaches near to land at a depth 
rapidly descending to eighty or one hundred, and subsequently reaching 
many hundred fathoms. The sea-bottom at such a depth would never have 
been laid bare during those two great upheavals of the earth’s surface which 
appear to have been the last great geological oscillations over the area of the 
north-west of Europe. Ata time when all the channels and sea which now 
separate our islands from each other, and from the rest of Europe, were raised 
high and dry above the level of the ocean, and the whole formed part of one 
great continent, the sea, if the calculations as to the extent of that elevation are 
anything like the truth, must still have broken on the rocky shores of the 
