HALIOTIS. 485 



long, entire-edged, a series of perforations forming an arc 

 parallel with and near to its left margin, and continuous 

 with the spiral crest of the convolutions. 



Animal shaped like the shell, its head terminating in a 

 short muzzle and bearing two subulate tentacles and two 

 stout eye-peduncles at their external bases ; a fimbriated 

 lobe between the tentacula apparently continuous with the 

 fimbriated and cirrhated lateral lobes of the body ; lateral 

 cirrhi numerous. Foot very large, oblong, rounded at the 

 extremities, bearing on its upper extremity a rudimentary 

 operculigerous lobe, but no operculum. Branchial plumes 

 two. Dental system of a median tooth flanked by two 

 laterals, four primary accessorial, and numerous second- 

 aries. 



This genus is littoral in its habits. It is characteristic 

 of the present epoch, and as a fossil is only known in the 

 later tertiaries. It occurs in the miocene beds of Malta, 

 but no species is found fossil in British formations. 



H. tuberculata, Linnaeus. 



Plate LXIV. and (Animal) Plate C.C. fig. 3. 



Lister, Anim. Angl. pi. 3, f. 1G. — Regenf. pi. 10, f. 42. 

 ffaliotis tuberculata, Linn. Syst. Nat. ed. 12, p. 1250*. — Penn. Brit. Zool. ed. 4, 

 vol. iv.p. 141, pi. 88. — Pui.teney, Ilutchins, Hist. Dorset, 

 p. 50. — Donov. Brit. Shells, vol. i. pi. 5. — Mont. Test. 

 Brit. p. 474. — Maton and Rack. Trans. Linn. Soc. vol. 

 viii. p. 227. — Rackett, Dorset Catalog, p. 57, pi. 22, 

 f. 1, 2. — Fleming, Brit. Anim. p. 3G2. — Brit. Marine 

 Conch, p. 155.— Brown, Illust. Conch. G. B. p. 23, pi. 12, 

 f. 2, 18.— Donov. in Rees, Cyclop. Conch.pl. 0, (1808). 

 — Dillw. Recent Shells, vol. ii. p. 1009. — Wood, Index 

 Testae, pi. 36, f. 4. — Lam. Anim. s. Vert. (ed. Desh.) 

 vol. ix. p. 26. — Desh. Encyclop. Method. Vers, vol. ii. 

 |it. 2, p. 179.— D'Orbignv, Moll. Canar. p. 95, pi. 7, f. 1, 

 animal (probably). — Philippi, Moll. Sicil. vol. i. p. 165 ; 

 vol. ii. p. 142. — IIanl. Young Conch, p. 59. — Reeve, 

 Conch. Iconica, vol. iii. Ilaliot. pi. 11, f, 34. 



