18/9.] ' LIGHTNING ' AND ' PORCUPINE ' EXPEDITIONS. 567 



terosato, in which some degree of curvature is observable. After I 

 had written the above I received from Dr. Hidalgo (to whom my 

 best thanks are due for this and other favours) a fine specimen of 

 Jus M. martorelh, which is considerably incurved in front, with a 

 corresponding arcuation at the back; and it exactly resembles 

 -Brugnone s fossil specimen. 



5. Mytilus modiolus, Linne. 



Mytilus modiolus, L. S. N. p. 1 158 : B. C. ii. p. Ill : v. p. 17] 

 pi. xxvii. f. 2. e 



fos'sd° rCUpine EXP ' 187 ° : Atl " SetUbal B ' A fra S ment > P erh aps 

 Distribution. Iceland to the west coast of France, White Sea, 

 Labrador to New York, Behring Strait to California and Japan, not 

 Greenland nor Spitsbergen ; 0-100 fms. Von Schrenck gives as 

 synonyms Modiola philippinarum of Hanley and Modiola australis 

 of txray, the former from the Philippine Isles, and the latter from 

 Australia. If these identifications are correct, they would imply a 

 more extensive distribution. 



Fossil. Pliocene and Post-tertiary. Scandinavia, Great Britain 

 and Ireland, Belgium, Italy, Labrador to Nantucket I. ; 0--170 ft. 



w 6. Mytilus barbatus, Linne. 



Mytilus barbatus, L. S. N. p. 1156 : B. C. ii. p. 114 • v p 171 

 pi. xxvii. f. 3. ' " r * ' 



'Porcupine' Exp. 1870: Atl. St. Vigo B.; Med. Benzert Road 

 (valves). 



Distribution. S. & W. England, Wales, and Ireland, southwards 

 to Malta and Alexandria, N. Japan and Gulf of Yedo; 0-95 fms. 

 Fossil. Pliocene. Red Crag, and Italy. 



7. Mytilus phaseolinus, Philippi. 



is Modiola phaseolina, Phil. Moll. Sic. p. 51, t. xv. f. 14. 



Mytilus phaseolinus, B. C. ii. p. 118; v. p. 171,' pi. XX vii. f. 5 

 'Porcupine' Exp. 1869: St. 1, 2. 1870 : Atl. Vigo B.,25, off 



C. Sagres, 26, 30, Tangier B. ; Med. Cartagena B., 50, 51, Rasel 



Amoush, off Rinaldo's Chair. 



Distribution. Iceland and Finmark to the ^Egean and Adriatic • 

 0-3000 fms. ' 



Fossil. Pliocene and Post-tertiary. Norway, Coralline Cra°- Bel- 

 gium, Italy, and Rhodes ; 0-100 ft. °' 



Among other synonyms are probably Mytilus barbatus of Midler 

 and Fabricms, but not of Linne, and certainly Modiola pusio of 

 Morch, but not of Philippi. 



I dredged a minute valve of Mytilus bidens, Linne, in the ' Por- 

 cupine' Expedition of 1870, at Station 17 a. A Foramiuifer (Rhab- 

 dammina abyssorum, M. Sars) was attached to it. M. bidens is a 

 West-Indian species, and has been acclimatized at Barcelona. 



