146 MANUAL OF THE MOLLUSCA. 



oblique, nacreous ; lip thin, even-edged ; operc. circular, horny, multi-spiral. 

 On reefs and under stones at low-water. 



Distr., 20 sp. Cape, India, N. Australia, China, Japan, Philippines. 



Sub-genus? Gena, Gray. Spire minute, marginal ; no operc ulum. 16 

 sp. Red Sea, India, Seychelles, Swan River, Philippines (Adams). 



BRODERIPIA, Gray. 



Etym., named in honour of W. J. Broderip, Esq., the distinguished con- 

 (hologist. 



Type, B. rosea. PI. X., fig. 20. 



Shell minute, limpet-shaped, with a posterior sub-marginal apex ; aper- 

 ture oval, as large as the shell, brilliantly nacreous. 



Distr., 8 sp. Philippines ; Grimwood's Island, S. Seas (Cuming). 



FAMILY X. HALIOTID^E. 



Shell spiral, ear-shaped or trochiform ; aperture large, nacreous ; outer 

 lip notched or perforated. No operculum. 



Animal with a short muzzle and subulate tentacles ; eyes on pedicels at 

 the outer bases of the tentacles ; branchial plumes 2 : mantle-margin with a 

 posterior (anal) fold or siphon, occupying the slit or perforation in the shell ; 

 operc. lobe rudimentary ; lingual dentition similar to trochus. 



In addition to the true haliotids, we have retained in this group such of 

 the trochi-forin shells as have a notched or perforated aperture. 



HALIOTIS, L. Ear-shell. 



Etym., hallos, marine, and ous (otos) an ear. 



Type, H. tuberculata, PL X., fig. 21. 



Shell ear-shaped, with a small flat spire ; aperture very wide, iridescent ; 

 exterior striated, dull ; outer angle perforated by a series of holes, those of the 

 spire progressively closed. Muscular impresssion horse-shoe shaped, the left 

 branch greatly dilated in front. In H. tricostalis (padollus, Montf.) the 

 shell is furrowed parallel with the line of perforations. 



Animal with fimbriated head-lobes ; side-lobes fimbriated and cirrated ; 

 foot very large, rounded. Lingual teeth; median small; laterals single, 

 beam-like ; uncini about 70, with denticulated hooks, the first 4 very large. 



The haliotis abounds on the shores of the Channel Islands, where it is 

 called the ormer, and is cooked after being well beaten to make it tender. 

 (Hanley) ; it is also eaten in Japan. It is said to adhere very firmly to the 

 rocks, with its large foot, like the limpet. The shell is much used for inlay- 

 ing, and other ornamental purposes. 



Distr., 75 sp. Brit., Canaries, Cape, India, China, Australia, New Zealand, 

 Pacific, California. 



Fossil, 4 sp. Miocene . Malta, &c. 



Sub-genus? Deridobranchus, Ehrenberg, D. argus, Red Sea. Shell 



p such of 



