122 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Feb. 19, 



Distribution. Bay of Biscay (' Travailleur ' Exp.), Mediterranean 

 (same, ' Shearwater ' and Italian Exps., Marion, and Nares) ; 120- 

 1062 fms. What I regard as a variety was procured in the 

 'Challenger' Exp., off Pal ma in the Canaries, at a depth of 1125 

 fms. ; it is rather larger, and the sculpture is stronger. I gladly 

 take again this further opportunity of publicly acknowledging my 

 obligation to the Rev. Robert Boog Watson, who has so patiently 

 and carefully worked out the greater portion of the 'Challenger' 

 Mollusca, for his courtesy in allowing me to compare them with the 

 Mollusca which are the subject of the present and preceding papers. 



Fossil. Pliocene : Messina {Seguenza). 



V 28. RissoA MONTACUTi {montagui), Payraudeau. 



R. monfagiii, Payr. Moll. Cors. p. Ill, t. v. f. 13, 14. 



' Porcupine' Exp. 1870 : Med. St. Algeciras B. 



Distribution. Rochelle (Dr. d'Orbigny), Cadiz {J. G. J.), Gibraltar 

 to the eastern coasts of tlie Mediterranean, Adriatic, Madeira (Wat- 

 son) ; 0-40 fms. 



Fossil. Miocene : Vienna and Bordeaux Basins, and Maine- 

 et-Loire. Pliocene : Italy. Post-tertiary : Leghorn, Ischia, Rhodes. 



Apparently Alvania lineata and other species of Risso ; but his 

 descriptions and figures are equally enigmatical and indeterminable. 

 There are also nine or ten more synonyms for this species and 

 its varieties including R. aspera of Philippi and R. algeriana of 

 Monterosato. 



I have ventured to slightly change the spelling of the specific 

 name, for the reason whicli I gave in B. C. (iv. p. 229) as to Natica 

 montacuti. It surely is desirable to adhere to the established rule 

 that all names of species should be given in Latin, preferably to a 

 merely Latinized form. I therefore, in Part V. of the present series 

 of papers (p. 673), substituted eccentros for excentrica. The former 

 is a classical word, and is found in all good lexicons and dictionaries ; 

 the other is neither classical nor found anywhere. I make this 

 remark with all respect for the opinions of M. Crosse and Herr 

 Weinkauff, who have criticized my alteration. 



1^ 29. RissoA wYviLLE-THOMSONi, Jeffreys. 



"R. weyville-thomsoni " (Jeffr.), Friele in Nyt Mag. f. Naturvid. 

 11S77 (separate copy), p. 3. It will be figured in the forthcoming 

 publications of the Mollusca from the ' Voringen ' Expedition A, 

 as well as in the Quarterly Journal of the Geological Society. 



'Lightning' Exp. St. 1. 



' Porcupine' Exp. 1869 : St. 77 (560 fms.). 



Dislrihition. ' Voringen ' Exp. ; cold area ; 488-510 fms. 



Fossil. Post- tertiary : Bridhngton (Lamplugh)\ 



This and the next species are umbilicated ; and if this character 

 were suflScient to warrant another section of the genus, the name 

 Pnnciulum might be appropriate. Another species, also a Brid- 

 lington tbssil, which I have named R. subperforata, has the same 

 peculiarity. 



