1883.] 'lightning' AND 'porcupine ' EXPEDITIONS. 97 



6. Trochus obscurus, Couthouy, 



Turbo obscurus, Couth, in Bost. Journ. N. H. ii. p. 100, pi. 3. 

 f. 12. 



'Lightning' Exp. St. 2. Fragment. 



'Porcupine' Exp. 1869: St. 51. Three living specimens. 



Distribution. Spitzbergen, Novaia Zemblia, and Jan Mayen I. to 

 Upper Norway, Aleutian I. and Sitka, G. St. Lawrence, Nova Scotia, 

 and N. England ; 0-430 fnis. 



Fossil. Post-tertiary: Novaia Zemblia (ZecAe). 



I consider Margarita albvla of Gould and M. bella of Verkriizen 

 varieties of the present species. 



7. Trochus grcenlandicus, Chemnitz. 



T. grcenlandicus, Chemn. Conch. Cab. v. p. 108, t. 171. f. 1671 : 

 B. C. iii. p. 298 ; v. p. 202, pi. Ixi. f. 5. 



'Lightning' Exp, St. 7. Fragments. 



'Porcupine' Exp.: N. Channel. 



Distribution. Spitzbergen, Jan JVIayen 1., Novaia Zemblia, 

 Siberian coast, Iceland, Faroes, Norway, Shetland and Orkneys, 

 Scotland, E. and W. Greenland, and Canada southwards to C. Cod ; 

 0-1. lO fms. 



Fossil. Post-tertiary : Scandinavia, E. and W. Scotland, Ireland ; 

 0-4 GO ft. 



Trochus cinerarius of Fabricius but not of Linne, Tr. Fabricii of 

 Philippi, Turbo incarnatus of Couthouy, Turbo carneus of R. T. 

 Lowe, Margarita undulata of G. B. Sowerby, and Tr. inflatus of 

 Brown. Possibly Turbo fuscus of O. F. jNIiiller and Marrjarita 

 striata of Leach. The sculpture in this, as well as in the last species, 

 is very variable. 



^ 8. Trochus cinctus, Philippi. 



T. cinctus. Ph. En. Moll. Sic. (1836) i. p. 185, t. x. f. 20, 20a. 



T. amabilis, B. C. iii. p. 300; v. pi. Ixi. f. 6. 



' Lightning ' Exp. St. 2, 



'Porcupine' Exp. 1869: 3, 14, 15, 2'6a, 36, 51, 61, 89. 1870 : 

 Atl. 1, 2, 3, 3a, 9, 13, 14. 24, 25, off C. Sagres, 26-30. And 

 variety affinis. 



Distribution. Shetland, W. Norway, var. affinis (Friele and G. O. 

 Sars), Bay of Biscay ('Travailleur' Exp. 1881-82), Azores ('Jose- 

 phhie' Exp.); 85-673 fms. 



Fossil. Pliocene : Coralline Crag, Monte Mario, Calabria, and 

 Sicily. 



Solariella (afterwards Margarital) maculata of S. V. Wood, and 

 Solarium calandrelli of Couti. I do not consider Turbo monili/erus 

 of Nyst (not of J. Sowerby), afterwards his Solarium turbinoides, 

 from the "sables iioirs" of Antwei'p, the same as the present species. 

 The shape and sculpture are very different As recent it^ is my 

 Trochus amabilis ; the variety affinis is MachcBroplax hidalgoi of 

 Fischer. T. affinis of D'Eichwald is a very different species. 



