1881.] 'lightning' and 'porcupine* expeditions. 945 



Distribution. Hammerfest to the iEgean ; coast of Syria and Sea 

 of Marmora, Adriatic, Mogador, Canaries ; 0-130 fms. 



Fossil. IMiocene : Vienna Basin and the greater part of the Euro- 

 pean continent, Calabria, "America" {Lyell)1 Pliocene: Coral- 

 line and Red Crag, Belgium, S.W. and S. France, Lisbon, Italy, 

 Algeria, Greece, Kos, Crete, Rhodes, and Cyprus. Post-tertiary : 

 Norway, Sweden, British Isles, Calabria; 0-1360 ft. Not C. 

 gibha of Philippi, from N.W. Germany, nor G. striata of Lamarck, 

 which is an Eocene fossil from Grigiion. Mr. Searles Wood 

 adopted as a specific name striata of Walker and Boys ; but that 

 was a sentence, and not a name in accordance with the binomial 

 method. There are many other obsolete synonyms. 



^ 2. CoRBULA mediterranea, Costa. 



C. mediterranea, O. G. Costa, Descr. Test. Sic. 1828, p. 182 ; Cat. 

 Sist. 1829, p. xxvi, t. 1. f. 6 : B. C. iii. p. 58 ; v. p. 192, pi. c. f. 8. 



'Porcupine' Exp. 1870 : Atl. 26, Tangier B. ; Med. Algesiras B. 



Distribution. Cork and Guernsey (valves only), Mediterranean 

 and Adriatic; 20-120 fms. 



Fossil. Pliocene : Sicily. Post-tertiary : Isle of Bute, Calabria. 



Syn. Telliiia parthenopcea of D. Chiaje (Philippi), and C. phy^ 

 soides of Deshayes. C. ovata of Forbes, which is closely allied to the 

 present species, is the same species as C. amurensis of Schrenck, 

 and perhaps C. Icevis of Hinds. The late Dr. Miirch informed me 

 that Prof. Kroyer had found two specimens of the last-mentioned 

 species at Christiausund, and that specimens (kindly sent me by 

 Morch) were from the collection of Fabricius, who might have taken 

 them either in Greenland or Norway. Fabricius was a clergyman, 

 and had the charge of a parish in Norway after he had been a 

 missionary in Greenland. Forbes's specimen may have come from 

 one of the glacial deposits in the Isle of Man, wliich have been de- 

 scribed by the Rev. J. Clifton Ward in the ' Geological Magazine ' 

 for January 1880. 



Family XXI. Myid^. 

 c^ 1. Mya trtjncata, Linne. 



M. truncata, L. S. N. p. 1112: B. C. iii. p. 66, pi. iii. i. 1 ; v. 

 p. 192, pi. 1. f. 2. 



'Porcupine' Exp. 1869: St. Donegal B., 70 (var. KJ6?eva//en5jV, 

 a semifossil valve). 



Distribution. Circunipolar in the northern hemisphere, ranging 

 southwards in the N. Atlantic to S.W. France on the east and to 

 Cape Cod on the west, and in the N. Pacific to N. Japan on the 

 east and Vancouver I. on the west, Tuscany?, Adriatic?, Black Sea?; 

 0-1333 fms. Living down to 80 fms. ; at the greatest depths 

 valves only from the walrus or cod. 



Fossil. Pliocene : Englisli Crag. Post-tertiary : from Spitzber- 

 gen and Siberia to Sicily on the east, aud from N. lat. 82° 35' to 

 Canada on the west ; 0-1360 ft. 



Proc. Zool. Soc— 1881, No. LXI. 61 



