KING—ON PALLIOBRANCHIATE SHELLS, 171 
2. Macandrevia cranvum—Terebratula, id.,* (Miiller). 
A specimen—the umbone of the large valve—of this rare species 
was brought up from 495 fathoms, in N. lat. 51° 3’, W. long. 14° 562’, 
It possesses the dental plates, emarginate foramen, and tubular struc- 
ture, diagnostic of the species. 
The specimen is not in a fresh condition, which suggests the possi- 
bility of its being the remains of an individual that lived in a late ter- 
tiary period. There is no reason, however, why it may not have 
belonged to a recent individual, as living specimens of the species have 
been obtained from deep water off Unst, one of the Shetland Isles. 
Order—Heticropracuia (J. E. Gray). 
3. Crania anomala (Miller). 
A few young specimens of this shell were found adhering to small 
pebbles brought up by the dredge from the ‘‘ Porcupine Bank”’ (so 
called by Hoskyn), at the depth of 120 fathoms, and about 120 miles 
west of Slyne Head. A fragment was also got on the Rockall Bank, 
about 300 miles west of Scotland. The species is common, in deep 
water, on the Atlantic coasts of Ireland and Scotland. 
It is noteworthy that a large number of small pebbles, from half an 
inch to three inches in size, came up in the dredge while exploring the 
«Porcupine Bank.’ Usually Serpulas Chitons and Cellepores were 
attached to all the surfaces of the pebbles, except the one on which 
it may be conceived they rested : a fact proving how little the pebbles 
can have been rolled about; and showing, as I pointed out in 1862, 
that a telegraph cable, laid at the comparatively shallow depth of 120 
fathoms, cannot be much affected by the heavy seas of the Atlantic. The 
success of the cable since laid down has confirmed my opinion. 
4. Discina Atlantica (nobis). 
This helictobrach, which does not appear to have been described, 
besides being one of the novelties of the ‘‘ Porcupine” expedition, is one 
of the most interesting additions to the conchology of ourseas. A single 
specimen of the upper valve, apparently belonging to a young individual, 
occurred to me on breaking open a piece of drab-coloured foraminiferal 
mud,} which came up in the sounding machine from the depth of 1240 
fathoms, in N. lat. 52° 8’, W. long. 15° 30’, or nearly due west of Dingle 
Bay. The place is evidently on the outer slope of the great submarine 
ridge, made known through the soundings of Commanders Dayman and 
Hoskyn, which runs in a meridional direction off the coasts of Cork and 
* The genus Macandrevia was diagnosed by myself in the ‘‘ Natural History Re- 
view,” vol. vi, p.520. Dublin, 1859. 
+ The mud contained pieces of rock, the largest half an inch long, apparently a ferru~ 
ginous sandstone. 
