1882.] 'lightning' AND 'porcupine' KXPEDITIONS. 671 



1. Tectura virginea, Miiller. 



Patella virginea, Miill. Piodr. Zool. Dan. p. 237. 



T. virginea, B. C. iii. p. 248 ; v. p. 200, pi. Iviii. f. 4. 



'Lightning' Exp., St. 4. 



• Porcupine' Exp. 1869 : Lough Foyle. 1870 : Atl. "Vigo B., 26 

 (vTiT. 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 \. {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 Middeudorff, ex vis. typ. 

 With respect to the question as to the relative precedence in date of 

 the generic name Tectura (or Tecture) and Acmcea, I would remark 

 that part v. of the ' Zoologischer Atlas ' of Eschscholtz (now before 

 me), which contains a diagnosis ai Acmcea, 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 

 Thuden in Sweden is two thirds of an inch long. 



l^ 2. Tectura fulva, Miiller. 



Patella fulva, Mull. Prodr. Z. D. p. 237. 



T. fulva, B. C. iii. p. 250 ; v. p. 200, pi. Ivii. f. 5. 



' Lightning ' Exp. : St. 2, 5. 



' Porcupine ' Exp. 1869 : 1, 6, 9, 68, Little Minch. 



Distribution. Finmark to Cape Clear, near Heligoland (Wein- 

 kauff). Bay of Biscay ('Travailleur' Exp. 1881)!, off Tripoli 

 (' Shearwater ' Exp.) ! ;" 10-487^ 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: 

 sculjiture a few slight and indistinct striae which radiate towards 

 the margin ; these are crossed by much stronger, close-set, and 

 lamellar or ridge-like strise 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 : beaJc somewhat incurved and overhanging the front margin : 



' Full of wrinkles. 



Proc. Zool. Soc 1882, No. XLV. 45 



