1881.] 'lightning' AND 'PORCUPINk' EXPEDITIONS. 929 



Distribution, Fiiimark and Faroe Is. to Sicily, Adriatic, Black 

 Sea ; 0-23 fms. Pliilippi, in his letter to Scacchi, dated 2nd Nov. 

 1844, stated that this species, as well as S. siliqua, from the German 

 Ocean and North Atlantic, were prohably different from those of the 

 Mediterranean ; but he gave no reason for his opinion. 



Fossil. Miocene: Madeira. Upper Tertiaries : Iceland, Coralline 

 and Red Crags, Belgium, Italy. Post-tertiary : Norway, British 

 Isles, Calabria ; 0-80 fms. Not >S. eiisis of Philippi, from the 

 Tertiaries of N.W. Germany, which is the S. rollei of Homes. 



i\Ir. David Robertson tells me that, during a very 1 jw spring-tide 

 at Cumbrae, he found three living specimens fixed upright in the 

 sand, with about an inch and a half of the shells exposed, to which 

 portion in each of the specimens two or three common mussels were 

 attached, so as to completely prevent the Solens getting further down 

 or burrowing. They appeared to be healthy. 



V 3. SoLEN VAGINA, Limie. 



<S. vagina, L. S. N. p. 1113 : B. C. iii. p. 20 ; v. p. 190, pi. xlvii. 

 f.3. 



'Porcupine ' Exp. 18/0 : Atl. C. Sagres, 26 (fragments). 



Distribution. Norway to Egypt, Black Sea, Adriatic, Red Sea?, 

 Azores ; 0-10 fms. 



Fossil. Miocene : Vienna and Bordeau.\ Basins, Switzerland, 

 Poland, Calabria. Upper Tertiaries : S. France, Italy, Algeria. 

 Post-tertiary : Belfast, Sicily, Morea. 



S. marginatns, Pulteney. The habitat given by Linne is "M. 

 Europeeo, Indico." The Indian species has been named S. trmicata 

 by W. Wood. 



Family XVIII. pANDORiD^i 

 ; Pandora iNiEanvALvis, Linne. 



Tellitia incEqiiivalvis, L. S. N. p. 1118. 



Pandora inccquivalvis, B» C. iii. p. 24, pi. i. f. 4 ; v. p. 190, pi. 

 xlviii. f. 1, la. 



'Porcupine' Exp. 1869 : St. 1, 6, 10, 13, 14, 23«, 25, 45a, 45b, 

 Little Minch (all var. pinna). 1870 : Atl. 16, Vigo B., 13, Setubal 

 B., C. Sagres, Tangier B. ; INled. Algesiras B., Cartagena B., G. Bona, 

 G. Tunis, Adventure Bank (all \&rs. jnnna and intermedia). 



Distribution. Spitzbergen and Arctic Ocean, Siberian coasts, and 

 N.E. America (as P. glacialis) to the M^em\, Adriatic, Mogador, 

 Madeira, and Canaries (as P. incequivalvis and P. pinna or obtusa); 

 type, laminarian zone ; vars. glacialis and pinna or obtusa, coralline 

 zone to 130 fms. An intermediate form occurs on the western coast 

 of France and at Corunna. Although this species is not uncommon 

 off the coasts of Shetland, it has not been noticed by modern writers 

 in any part of the Scandinavian seas. Chemnitz said that, accord- 

 ing to Grouovius, it inhabits the coast of Norway. 



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

 Proc. Zool. Soc— 1881, No. LX. 60 



