102 DR. GWYN JEFFREYS ON THE MOLLXJSCA OF THE [Mar. 6, 



T. leucophceus of Philippi appears to be a variety. It is strangely 

 omitted in his terrible list of between 400 and 500 so-called species 

 of Trochus given in Kiister's edition of the ' Conchylien-Cabinet ' 

 subsequently to the publication of Philippi's work on the MoUusca 

 of the two Sicilies. 



i 20. Trochus adansoni, {adansonii) Payraudeau. 

 T. adansonii, Payr. Moll. Corse, p. 127, t. vi. f. 7, 8. 



' Porcupine ' Exp. 1870: Med. St. Algesiras B. A small and 

 non-umbilicate variety. 



Distribution. Throughout the Mediterranean, Adriatic, and Black 

 Sea ; 1-2771 fms. 



Fossil. Pliocene : Coralline Crag, Italy, Archipelago, and S. Russia. 



I am inclined to unite with this common species, as synonyms or 

 varieties, T. turbinoides of Deshayes, T. saulcyi of d'Orbigny, T. 

 adriaticus and T. biasoletti of Philippi, T. olivaceus and T. cine- 

 rascens of Anton, T. colybii of Mittre, T. paUidus, lyciactis, and 

 spratti of Forbes, T. albidus of Weinkauff as of Gmelin, T. 

 drepanensis of Brugnone (young), and other species. Brusina refers 

 it to T. angulatus of D'Eichwald (Zool. spec. Rossiae et Polonise, 

 1829) ; but that is a very questionable identification, and the specific 

 name had been previously used by Quoy and Gaimard for another 

 species of Trochus. 



u 21. Trochus tumidus, Montagu. 



T. tumidus, Mont. Test. Brit. p. 280, t. 10. f. 4 : B. C. iii. 

 p. 307 ; V. p. 203, pi. Ixii. f. 2. 



' Lightning ' Exp. St. 7. 



'Porcupine' Exp. 1869 : St. L. Foyle. 1879: Atl. 12, Gibral- 

 tar B. 



Distribution. Iceland, Faroes, and Finmark to Egypt and the 

 Adriatic ; 0-145 fms. 



Fossil. Pliocene : Red Crag. Post-tertiary : Scandinavia, Scotland, 

 Ireland, and Selsea ; 0-460 ft. 



Var. minor. T. rachetti, Payraudeau, and T. gibbosulus, Danilo 

 and Sandri. This is the usual form in the Mediterranean, although 

 I have the typical form from Corsica. I now believe that it cannot 

 be (as Dillwyn supposed) T. nassariensis of Chemnitz or T. pathola- 

 tus of Gmelin, which was said to have derived the first specific 

 name from the Nassau Islands in the Indian Ocean. The fry was 

 figured by Walker as T. fuscus, and described by Macgillivray as 

 Skenea serpuloides. 



\y 22. Trochus umbilicatus, Montagu. 



T. umbilicatus, Mont. Test. Brit. p. 286 : B. C. iii. p. 312 ; 

 V. p. 203, pi. Ixii. f. 4, 4 a. 



' Porcupine ' Exp. 1869 : St. Donegal B. 1870 : Atl. Vigo B. 

 Distribution. Stornoway to Gibraltar, Mogador, G. Lyons, Al- 

 giers, G. Naples, and other parts of the Mediterranean as well as 



