184 
Genus 17. Gissutxa, Leach. 
Trochus, sp. Linn.—Steromphala, Leach.—Monodonta, sp. Lam. 
1. GrpBuLA maGus, Linn. 
Trochus magus, Linn. Syst. Nat. ed. 12. p. 1228.—Trochus tuber- 
eulatus, Da Costa. 
Hab. British Islands. 
2. GiBBULA FanuLum, Gmel. 
Trochus Fanulum, Gmel., Petiver, Gazoph. t. 156. f. 15. 
Hab. Malta. 
3. GrpsuLa pbectivis, Forskal. 
Turbo declivis, Forsk. Descr. Anim. p.126; Chemn. Conch. pl.171. 
f. 1663, 1664.—Trochus Asgyptiacus, Gmel. 
Hab. Suez. 
4. GIBBULA CINERARIA, Linn. 
Trochus cinerarius, Linn. Syst. Nat. ed. 12. p. 1229.—Trochus 
lineatus, Da Costa.—Trochus perforatus, Smith.—Trochus inflatus, 
Blainv.—Trochus versicolor, Andrg.—Trochus lineolatus, Potiez and 
Mich.—Trochus littoralis, Brown.—Trochus electissimus, Bean. 
_Hab. British Tslands. 
5. GiBBULA SCABRA, Linn. 
Trochus scaber, Linn. Syst. Nat. ed. 10. no. 510. p. 785; Chemn. 
Conch. t. 171. f. 1667. 
Hab. European Seas. 
6. GIBBULA QUADRATA, Gmel. 
Trochus quadratus, Gmel., Wood, Ind. Test. pl. 29. f.45; Chemn. 
Conch. pl. 171. f.1683.—Trochus Biasoletti, Philippi.—Trochus ma- 
gulus, Deshayes. 
Hab. Mediterranean. 
7. GIBBULA FuSCATA, Born. 
Trochus fuscatus, Born, Test. Mus. Ceesar. t. 12. f. 1, 2.—Trochus 
umbilicaris, Lamk. (not Linn.) 
Hab. 2 
8. GippuLA CINEREA, Montague. 
Trochus cinereus, Mout., Donov. Nat. Hist. Brit. Sh. v. t.155. f. 3. 
Hab. Britain. , 
9. GrpBuLA prvaRicaTA, Linn. 
Trochus divaricatus, Linn. Syst. Nat. ed. 12. p. 1229.—Trochus 
rarilineatus, Michaud.—? Turbo sanguineus, Gmel. 
Hab. Mediterranean. 
10. GisspuLa TumrDA, Montague. 
Trochus tumidus, Mont. Test. Brit. t. 10. f. 4. —Trochus Rackettii, 
