1882.] ‘LIGHTNING’ AND ‘ PORCUPINE” EXPEDITIONS. 671 
1. Tectura virGinea, Miller. 
Patella virginea, Mull. Prodr. Zool. Dan. p. 237. 
T. virginea, B. C. iii. p. 248; v. p. 200, pl. lviii. f. 4. 
‘ Lightning’ Exp., St. 4. ; , 
‘ Porcupine’ Exp. 1869: Lough Foyle, 1870: Atl. Vigo B., 26 
(var. conica), 31-34 (same var.); Med. 50, Adventure Bank, off 
Rinaldo’s Chair. 
Distribution. North Atlantic from Iceland and Norway to 
Madeira, Canaries, C. Verd I. (de Rochebrune), St. Helena (Melliss) |, 
Azores, Mediterranean to the Archipelago, and Adriatic ; 0-150 fms. 
Fossil. Miocene: Marne Vaticano (Ponzi). Pliocene: Red and 
Antwerp Crags, Italy, Rhodes. Post-tertiary : Scandinavia, Great 
Britain and Ireland, Italy ; 0-460 ft. 
For synonyms see ‘ British Conchology ;’ but this species is not 
the Patella pileolus nor P. asmi of Middendorff, ex vis. typ. 
With respect to the question as to the relative precedence in date of 
the generic name Tectura (or Tecture) and Acmea, I would remark 
that part v. of the ‘ Zoologischer Atlas’ of Eschscholtz (now before 
me), which contains a diagnosis of Acmea, was published in 1833 ; 
Tecture was published in 1830. The Dorpat edition of the ‘ Atlas,’ 
published in 1828, does not name any type or species. 
An adult specimen dredged by Admiral Acton in the Bay of Naples 
from 60 fathoms has a completely spiral and persistent apex or 
nucleus. Some Mediterranean and Adriatic specimens have the 
same shape and coloured markings as those from the North Atlantic ; 
and the position of the apex is very variable. I therefore cannot 
regard the Lottia unicolor of Forbes as a distinct species. Post- 
tertiary specimens are occasionally very large; one collected by 
Thudén in Sweden is two thirds of an inch long. 
& 2. Tecrura Futva, Miller. 
Patella fulva, Mill. Prodr. Z. D. p. 237. 
T. fulva, B. C. iii. p. 250; v. p. 200, pl. lvii. f. 5. 
‘ Lightning’ Exp.: St. 2, 5. 
‘Porcupine’ Exp. 1869: 1, 6, 9, 68, Little Minch. 
Distribution. Finmark to Cape Clear, near Heligoland (Wein- 
kauf’), Bay of Biscay (‘Travailleur? Exp. 1881)!, off Tripoli 
(‘ Shearwater’ Exp.)!; 10-4873 fms. 
Fossil. Pliocene: Red Crag, and Sicily. Post-tertiary : Norway ; 
100-440 ft. 
3. Tectura ruGosA’, Jeffreys. (Plate L. fig. 2.) 
SHELL oblong-oval, convex, rather thin, opaque and lustreless: 
sculpture a few slight and indistinct strie which radiate towards 
the margin; these are crossed by much stronger, close-set, and 
lamellar or ridge-like strie in the line of growth, which give a 
wrinkly appearance ; the points of decussation are nodulous; the 
nucleus and upper part of the shell are quite smooth: colour 
whitish : beak somewhat incurved and overhanging the front margin : 
’ Full of wrinkles. 
Proc. Zoox. Soc.—1882, No. XLV. 45 
