100 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Mar. 6, 



having a broad and flattened base, which he considered the present 

 species. 



JTossil. Pliocene : Leghorn {Ajopelius). Post-tertiary : Cumbrae 

 (Robertson), Selsea (A. Bell). 



Trochus crassus of Pulteney, whose T. lineatus is the young ; a 

 variety is Monodonta articulata, Lamarck, M. draparnaudi, Payrau- 

 deau, M. punctulata, de Blaiuville (not of Lamarck), M. sitis, Recluz 

 (young), and Turbo corcyrensis, Stossich (young). Not Troclms 

 lineatus of Lamarck, which is a Senegalese species. 



The young are umbilicate, as in the last and other species of this 

 genus. 



13. Trochus turbinatus, Born. 



T. turbinatus. Born. Mus. Caes. Vind. Test. 1778, p. 340; id. 

 1780, t. 12. f. 5, 6. 



' Porcupine' Exp. 18/0: Med. St. Algesiras B. 



Distribution. Charente-Inferieure (Beltremieux), throughout 

 the Mediterranean and Adriatic, Canaries (Lister and d'Orbigny) ; 

 0-2 fms. 



Fossil. Pliocene : Italy. Post-tertiary : S. France. 



This species, which is so peculiar to the Mediterranean and 

 Adriatic, is also T, tessulatus of Born, T. tessellatus of Gmelin, 

 Monodonta fragaroides of Lamarck, M. olivieri of Payraudeau, 

 and T. fragarioides of Philippi, a variety being his T. mutabilis. 



Perhaps T. lineatus may be the same species. The publications 

 jf Da Costa and Born were contemporaneous. Both species, if 

 distinct, are variable; and there appear to be intermediate gradations. 



D. GiBBULA, Risso. 



i^ 14. Trochus magus, Linne. 



T. magus, L. S. N. p. 1228: B, C. iii. p. 305 ; v. p. 203, pl.lxii. 

 f 1. 



'Porcupine' Exp. 1870: Med. Capo di Gaeta, Benzert Road, 

 Adventure Bank. 



Distribution. S.W. Sweden and Shetland to Mogador, Mediterra- 

 nean, Adriatic, Canaries ; 0-40 fms. 



Fossil. Pliocene : Italy, Rhodes, Cos, C. Verde I. Post-tertiary : 

 Norway, British Isles, and Tuscany ; 0-1360 ft. 



(^ 15. Trochus richardi, (rickardii) Payraudeau. 



T. richardii, Payr. Moll. Corse (1826), p. 138, t. vii. f. 1, 2. 



'Porcupine' Exp. 1870 : Atl. St. Gibraltar B. 

 Distribution. Coast of Portugal and Gibraltar (McAndrew), 

 Mediterranean and Adriatic, Canaries (d' Orbigng) ; 0-13| fms. 



Fossil. Pliocene: Italy. Post-tertiary: S.France and Leghorn. 



Turbo variegatus (1813) and Phorcus margaritaceus (1826), Risso ; 

 Trochus cinerarius, Costa, not Linne. 



