1881.] 'lightning and 'porcupine' expeditions. 923 



♦ Porcupine' Exp. 1870 : Atl. St. Vigo B., Setubal B., C. Sagres, 

 26, 30, 3() ; Med. Algesiras B., 50, Benzert Road, Adventure Bank, 

 off Rinaklo's Chair. 



BistrihUion. W. Ireland and S. England to the Archipelago, 

 Madeira, Canaries, and Azores; 12-162 fms. 



Fossil. Miocene : Vienna Basin, Hungary, S.W. France, Calabria, 

 Madeira. Upper Tertiaries: S. France, Italy, Rhodes. Post-tertiary: 

 Calabria. 



Ei'ycina pusilla of Philippi. 



u 2. Amphidesma cornexim, Poli. 



Mactra cornea, Poli, Test. utr. Sic. i. p. 73, t. 19. f. 8-11. 



A. corneum, B. C. ii. p. 414 ; v. p. 188. 



'Porcupine' Exp, 1870 : Atl. St. 26 (valve). 



Distribution. Carnac in Brittany (J. 0. J.) to Syria, Adriatic, 

 Black Sea ; 0-2 fms. 



Fossil. Miocene : Vienna and Touraine Basins, Hungary. Upper 

 Tertiaries : S. France, Italy. Post-tertiary : Calabria. 



Donax plebeia. Pennant, Amphidesma donacilla, Lamarck, Dona- 

 cilla lamarcki, Philippi. 



1/ ] . Mactra solida, Linne, 



M. solida, L. S. N. p. 1126: B. C. ii. p. 415, pi. viii. f. 2; 

 V. p. 188, pi. xliii. f. 2, 2a. 



' Lightning ' Exp. St. 5 (typical) ; 4, 5, 7, Faroe Isles (var. 

 elliptica). 



'Porcupine' Exp. 1869: 13, 15, Lough Foyle, 68, The Minch. 

 1870: Atl. Vigo B., Setubal B., C. Sagres (var. intermedia) ; Med. 

 Capo de Gata (valve, var. elliptica). 



Distribution. Iceland and Finmark to N.W. Spain, Adriatic (on 

 several authorities), Mediterranean?; 0-205 fms. The typical 

 form is littoral, the variety elliptica from deeper water. 



Fossil. Upper Tertiaries and Post-tertiary : Iceland, Norway, 

 British Isles, Belgium?, Germany?, Biot, Italy ; 0-130 ft. 



M. vulgaris, Chemnitz, M. truncata, Montagu, M. castanea and 

 M. crassatellu, Lamarck, M. elliptica. Brown, and other synonyms 

 for recent and fossil varieties. Not M. solida of Payraudeau, which 

 is M. stultorum, var. corallina. 



2. Mactra subtruncata, DaCosta. 



Trigonella subtruncata, DaCosta, Brit. Couch, p. 198. 



M. subtruncata, B. C. ii. p. 419 ; v. p. 188, pi. xliii. f. 3. 



'Porcupine' Exp. 1869: St. 9, 19 (valve). 1870: Atl. 10, 

 Vigo B., 13, C. Sagres, 30, 36, Tangier B. ; Med. Algesiras B., 50, 

 G. Bona, Adventure Bank. 



Distribution. Finmark to the Morea and Black Sea, Adriatic, 

 Mogador, Madeira ?, Canaries ? ; 0-CO fms. 



Fossil. Miocene : Vienna and Bordeaux Basins, Switzerland, 

 Germany, Transylvania, Calabria. Pliocene: Coralline and Red 



