1881.] 'lightning' AND ' PORCUPINE ' EXPEDITIONS. 935 



Family XIX. Anatinid.e. 

 l/ 1. Thracia pr^tenuis, PuUeiiey. 



Mrja -prcetenids, Pult. Cat. Dors. p. 28, pi. iv. f. 7. 



T. pratenuis, B. C. iii. p. 34; v. p. 190, pi. xlviii. f. 3. 



•Porcupine' Exp. 1869: St. 10 (young), Galwiiy B., 17 (young). 



Distribution. Iceland and Loffoden Is. to Algiers and Sicily ; 

 0-50 fms. 



Fossil. Pliocene: Coralline Crag, Italy, Rhodes. Post-tertiiiry : 

 Norway, England.. Calabria; 0-130 ft. 



*^ 2. Thracia papyracea, Poli. 



Tellina papyracea, Poli, Test. Sic. i. p. 43, t. xv. f. 14, 18. 



Thracia papijvacea, B. C. iii. p. 36, pi. ii. f . 2 ; v. p. 191, pi. xlviii. 

 f. 4, 4a. 



'Porcupine' Exp. 1869: St. 10, 25, 33, 36 (fragment), 68. 

 1870: Atl. 10, Vigo B., 26-28a; Med. Cartagena B., 55 (frag- 

 ment). 



Distribution. Iceland and Loffoden Is. to the ^gean, Adriatic, 

 Morocco, Madeira, Canaries, ?G. Mexico ('Blake' Exp.) ; 0-640? 

 fms. 



Fossil. Miocene: Vienna Basin. Pliocene: Coralline Crag, Italy. 

 Post-tertiary: Norway, Sweden, Great Britain and Ireland, Cala- 

 bria; 0-130 ft. 



3. Thracia pubescens, Pulteney. 



Mya pubescens, Pult. Cat. Dors. p. 27, pi. iv. f. 6. 



T. pubescens, B. C. iii. p. 38; v. p. 191, pi. xlviii. f. 5. 



' Porcupine' Exp. 1870 : Atl. St. Setubal B., C. Sagres (fragmen- 

 tary), 36 (valve) ; Med. Capo de Gata (fragment). 



Distribution. S. England to G. Egina, Adriatic, Morocco, Cana- 

 ries ; 1-130 fms. 



Fossil. Pliocene : Coralline Crag, Italy. Post-tertiary : York- 

 shire, Scotland, and Ireland, Calabria. 



4. Thracia convexa, W. Wood. 



Mija convexa, W. Wood, Gen. Conch, i. p. 92, pi. 18. f. 1. 



T. convexa, B. C. iii. p. 39 ; v. p. 191, pi. xlviii. f. 6. 



♦Porcupine' Exp. 1869: St. Loch Torridon. 1870 : Atl. 10, 16, 

 C. Sagres, 27-28a ; Med. off Basel Amoush. All the specimens 

 are fragmentary. 



Distribution. Bergen to Sicily and the Adriatic, Sitka (Dall, as 

 T. curia of Conrad) ; 4-628 fms. 



Fossil. Miocene : Vienna Basin and Switzerland. Pliocene : Co- 

 ralline Crag, Italy. Post-tertiary : Norway, Scotland and Ireland, 

 Calabria ; 0-500 ft. 



Besides the synonyms given in ' British Conchology,' I may men- 

 tion T. trigona of Aradas and T. hiatelloides of Brusina. 



