248 Mr. J. Gwyn Jeffreys on Dredging 
All these I will now notice as regards the Mollusca. Other 
branches of the marine Invertebrata will be treated of by 
Mr. Norman, Mr. Waller, and Dr. M‘Intosh ; and Dr. Giinther 
has kindly promised to report on a few small fishes caught in 
the dredge. 
1. New Species.—The species I am about to enumerate are 
new to the British fauna, but not to science. 
Terebratella Spitzbergensis, Davidson. 
A fresh and perfect, although dead, specimen occurred in 
80-90 fathoms off Unst. The only locality hitherto recorded 
for this shell in a living state is Spitzbergen. It was found by 
Hisinger and myself in a fossil state at Uddevalla, and last year — 
by Messrs. Crosskey and Robertson in another raised sea-bed 
near Christiania. There is, of course, a possibility that the 
Shetland specimen also may be fossil; but it has all the appearance 
of being recent ; and Terebratula cranium and T. caput-serpentis 
(both of which are likewise arctic species) live in the same place 
where this specimen of Terebratella Spitzbergensis was dredged. 
Rhynchonella psittacea, Gmelin. 
A specimen (unfortunately broken in dredging) was found 
with Terebratella Spitzbergensis, Terebratula cranium, and T. 
caput-serpentis. This was filled with soft mud, in which was a 
fresh, but dead, young specimen of R. psittacea. I had ona 
former occasion dredged a full-grown specimen and a young one 
(both quite perfect, although not living) off Unst. In ‘British 
Conchology,’ vol. ii. pp. 22 & 23, is an account of all the speci- 
mens said to have been taken by Capt. Laskey and others in the 
British seas; and I am still convinced that most of these re- 
ported discoveries were mistakes, and that some of the speci- 
mens are fossil. The present case is free from doubt, except 
on the latter ground. Single valves of Pecten Islandicus, Tellina 
calcaria, and Mya truncata, var. Uddevallensis, are not uncommon 
on the northern and eastern coasts of Shetland, and were procured 
with 7. Spitzbergensis and R. psittacea; but the former had 
an unmistakeably fossilized or chalky aspect, and never were 
perfect or had the valves united. It seems to be an established 
rule that all marine invertebrate animals increase in bulk north- 
wards; and thus the comparative size of living and dead speci- 
mens of arctic species found in the Shetland seas may serve as 
an additional test to distinguish which of the latter were re- 
cent and which fossil. The two Brachiopods in question must, 
I think, stand or fall together as British. Mr. Davidson (the 
great authority on this abnormal class of the Mollusca) says 
9 
