268 MANUAL OF THE MOLIIJSCA. 



Family X. — Haliotld^, 



Shell spiral, ear-shaped or trocliiforiri ; aj^erture large, 

 nacreous ; outer lip notclied or perforated. No operculum. 



Animal witli 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 sijDhon, 

 occupying the slit or perforation in the shell ; operculum lobe 

 rudimentary ; lingual dentition similar to trochus. 



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

 group such of the trochiform shells as have a notched or per- 

 forated aperture. 



Haliotis, L. Ear-shell. 



Etymology, hallos, marine, and ous {otos), an ear. 



Type, H. tuberculata, PI. 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. Mus- 

 cular impression horse-shoe shaped, the left branch greatly 

 dilated in front. In H. tricostalis (padoUus, Montfort) the shell 

 is furrowed parallel with the line of perforations. 



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

 cu'rated; 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 inlaying and other 

 ornamental j)urposes. 



Distribution, 75 species. Britain, Canaries, Cape, India 

 China, Australia, New Zealand, Pacific, California. 



Fossil, 4 species. Miocene — . Malta, &c. 



S lib-genus ? Deridobranchus, Ehrenberg, D. argus, Eed Sea. 



Shell large and thick, like haliotis, but entii'ely covered by the 

 thick, hard, plaited mantle of the animal. 



Stomatia (Helblin), Lamarck. 



Etymology, stoma, the aperture. 

 Type, S. phymotis, PL X., Fig. 22. 



Shell like haliotis, but without perforations, their place being 

 <7ccupied by a simple fuiTow ; surface rugose, spirally ridged; 



