38 DR. GWYN JEFFRKYS ON THE MOLLUSCA OF THE [Jan. 20, 



Indian Ocean and the coast of Madagascar) are certainly not applic- 

 able to this common Mediterranean species. Weinkauff regards the 

 typical form (his millepunctata) and N. hebrcea as different species. 

 Karsteii's name punctata, which was adopted by Risso without 

 acknowledgment, or through coincidence, is ten years subsequent 

 to Gmelin's. 



Family XXI. Neritid^e. 



Neritina viridis, Linne. 



Nerita viridis, L. S. N. p. 1254; Chemnitz, Conch. -Cab. ix. 

 t. 124. f. 1089. 



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



Distribution. Mediterranean from the south of France to the 

 coast of Syria, Adriatic, Madeira, Canaries, West Indies, and 

 Martinique ; 3-120 fms. It is an inhabitant of shallow water. 



Fossil. Post-tertiary : Palermo (Philippi). 



Varies in the intensity of colour as well as in the markings. 



Family XXII. Solariid,^. 

 1. Solarium vseudoperspectivum, Brocchi. 



Trochus pseudoperspeclivus, Brc. Foss. Subap. ii. p. 359, t. v. 

 f. 18. 



Solarium discus, Philippi, Moll. Sic. ii. p. 225, t. xxviii. f. 12 ; 

 Conch.-Cab. (ed. Kiister), Solarium, p. 29, t. 4. f. 9. 



•Porcupine' Exp. 18/0 : Med. St. 50, 51, Benzert Road, Rasel 

 Amoush, Adventure Bank. 



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

 the Mediterranean, Alexandria {Lamarck, as S. perspectivum), 

 Barbary {Ponsonby), Canary I. (McAndrew) ; 40-108 fms. 



Fossil. Miocene : Vienna Basin, Perpignan, and Calabria. Plio- 

 cene : (?) Biot near Antibes, Italy, Sicily, and Algeria. Post- 

 tertiary : Selsea, Morea. 



Owing to the variability of the shell, especially in the fossil state, 

 the synonyms are rather numerous. I regard S. simplex of Bronn, 

 5*. lyellii of Michelotti, S. discus of Philippi, ;Sf. sulcatum of O. G. 

 Costa (not of Lamarck), 5. pulchellum of Tiberi (not of Michelotti), 

 S. perspecti/orme also of Tiberi, S. mediterraneum of Monterosato, 

 probably S. nuperrimum of Brugnone, and perhaps S. contextum of 

 Seguenza, as varieties of the present species. The number of 

 concentric ridges or striae, as well as the height of the spire, and 

 consequent contraction of the umbilicus, differ in specimens from 

 distant localities. 



The lowest part or deepest interior of the umbilicus, which 

 represents the obverse of the spire, is flattened, and has the whorls 

 reversed or sinistral. Monterosato has described the animal in the 

 ' Journal de Conchyliologie ' for 18/4. 



