Involute.] 



MOLLUSCA. 



23 



Genus 28 Haliotis Linnaeus. 



Shell ear-shaped, ovate, oblong, or nearly round, and depres- 

 sed ; with a very short, flattened, somewhat lateral spire; aper- 

 ture extremely large, nearly embracing the whole shell, mostly 

 entire, and of an ovate, or oblong form in the adult state ; disk 

 having a series of circular, or ovate, perforations running paral- 

 lel to the columellar or left margin, which commences with a 

 notch ; columellar lip usually flattened, or hollow, in front ; 

 sometimes with a strongly developed central impression; inside 

 always pearlaceous, exhibiting brilliant iridescent reflections. 



1. H. tuberculata, pi. XII, f. 2 and 18— First Ed., pi. 3G, 

 f. 2 and 18; Haliotis tuberculata, Pennant, Brit. Zool., IV, p. 

 141, pi. 88, f. 144; Donovan, Brit. Sh., I, pi. 5 ; Montagu, p. 

 473; Fleming, Brit. An., p. 362 ; Turton, Brit. Fauna., p. 196; 

 Brown, Wernerian Memoirs, II, p. 532; Lamarck, VI, pt. 2nd, 

 p. 215. 



Shell ovate oblong, flat, with coarse, slightly waved, longitu- 

 dinal stria?, and strong transverse wrinkles, and extremely close, 

 irregular stria; ; near the inner margin is a produced ridge, 

 extending from the base to the first turn of the spire, and beset 

 with irregularly formed tubercles, decreasing 1 in size as they 

 approach the apex ; behind this the margin is rounded, and 

 turns inward ; above this is another ridge, in which there is a 

 series of large tubercles, which also decrease towards the apex ; 

 six or eight of the lower ones being perforated with ovate holes; 

 the upper tubercles imperforate, and flattened at top ; aperture 

 very wide and entirely open, concave, transversely crossed by 

 shallow, broad furrows, and highly pearlaceous, exhibiting beau- 

 tiful iridescent reflections ; outer margin thin ; columellar lip 

 broadly reflected, forming a flattened rim round the left side of 

 the disk, nacred like the rest of the interior, and ending about 

 an inch from the base. Length varying from three to four 

 inches. 



Dead shells have been found on the coasts of Sussex, Dor- 

 setshire, and Devonshire. It is found abundantly adhering to 

 rocks, near low water mark, in Guernsey. Mr. Templeton, of 

 Belfast, procured one specimen by the dredge at Springfield, 

 countv of Down, Ireland, and he assured me that several speci- 

 mens had been picked up on these shores. 



Genus 29 Sigaretus.— Lamarck. 



Shell suborbicular, subauriform, depressed ; spire submargi- 

 nal, much flattened, and sometimes compressed, consisting of 

 not more than two or three volutions ; aperture entire, much 

 dilated, oblong-ovate, its edges disunited at the upper extremity, 

 in consequence of the outer lip embracing the base of the last 

 volution ; inner lip short, spirally twisted, in general slightly 

 reflected at its upper part, sometimes to such an extent as to 

 produce a small umbilicus ; within the aperture are two mus- 

 cular impressions, the one in the upper, and the other in its 

 lower extremity. 



1 . S. Haliotoideus, pi. II, f. 1 , 2— First Ed., pi. 44, f. 1 , 2 ; 

 Sigaretus haliotoideus, Lamarck, pt. 2nd, p. 208 ; S. per- 

 spicuus, Forbes, Mai. Mon., p. 29; Sulla haliotoidea, Montagu, 

 p. 211, pi. 7, f.6, and Vignette 2, f.6; Brown, Ency. Brit.; VI, 

 p. 434 ; Turton, Brit. Fau., p. 168. 



Shell suboval, extremely thin, pellucid, white, glossy, and 



smooth; very slightly wrinkled longitudinally by the lines of 

 growth ; spire very small and obtuse, consisting of two obliquely 

 twisted volutions ; aperture oval, very large, but not quite ex- 

 tending to the apex ; body very large, and exposing the whole 

 interior; outer lip thin; inner lip concave, and slightly inflected. 

 Length three-quarters of an inch ; breadth half an inch. 



Found in Salcomb Bay and Torcross, Devonshire ; Studland 

 beach and Weymouth, Dorsetshire; Downshire coast, Ireland; 

 and in the Frith of Forth, Scotland. It appears to inhabit deep 

 water. 



2. S.flexelis, pi. II, f. 3, 4— First Ed., pi. 44, f. 3, 4 ; Bulla 

 Jlexilis, Montagu, Sup., p. 168; Laskey, Wernerian Memoirs, I, 

 p. 396, pi. 8, f. 6. 



Shell suboval, pellucid ; reddish horn coloured ; extremely 

 thin, transparent, with pretty strong longitudinal wrinkles ; spire 

 very small, consisting of one obliquely twisted volution ; aper- 

 ture oval, extending nearly to the apex ; outer lip thin ; inner 

 lip slightly inflected. Length not quite half an inch ; breadth 

 an eighth and a half. 



This may be distinguished from the S. Haliotoides by its 

 reddish horn colour, in the spire having but one volution, the 

 inflection of the inner lip being only about half the breadth, by 

 the base of the aperture being more acute, and in the wrinkles 

 being much stronger. It is quite flexible when newly extracted 

 from the animal. 



Found at Dunbar, by Captain Laskey. 



Genus 29. — Galericulum. — Brown. 



Shell semiovate ; body extremely large, destitute of a colu- 

 mella; spire very small; aperture very large; outer lip and pillar 

 lip continuous, the latter broad and reflected on the body ; ge- 

 nerally covered with an epidermis. 



1. G. Icevigatum, pi. XIX, f. 35 and 38^— First Ed., pi. 38, 

 f. 35 and 38; Helix leevigata, Donovan, Brit. Sh., Ill, pi. 105; 

 Montagu, p. 382 ; Turton, Brit. Fau., p. 195; Velutina Icsvi- 

 gata, Fleming, Brit. An., p. 326 ; Forbes, Mai. Mon., p. 29. 



Shell thin, fragile, suborbicular, flesh coloured ; with three 

 volutions ; the body extremely large, and the spire very small, 

 and slightly produced, placed laterally, and terminating in a 

 compressed apex ; the shell wrinkled transversely, and striated 

 longitudinally, or spirally ; covered with a thick, rough, brown 

 epidermis, which is generally elevated into regular, equidistant, 

 membranaceous, spiral ridges; aperture suborbicular, extremely 

 large, inside smooth, glossy, and ,of a purplish-brown colour ; 

 sometimes almost white; outer lip very thin; inner lip some- 

 what oblique, and reflected on the body ; behind which there 

 is a slight groove. Ordinary size three-quarters of an inch in 

 length, and five-eighths in breadth ; but found of very superior 

 dimensions at Portmarnock, and other places on the east coast 

 of Ireland, measuring nearly an inch and an eighth in length, 

 and three-quarters in breadth. 



Found at Southampton ; at Torcross and Salcomb, Devon- 

 shire ; Studland, Dorsetshire ; Falmouth, Cornwall ; Teign- 

 mouth, Wales ; and the Frith of Forth, Scotland. 



2. G. ovatum, pi. XIX, f. 27, 28 First Ed., pi. 38, f. 27, 



28. 



Shell oblong-oval, much inflated; body very large; spire con- 

 sisting of a single, small, knob-like volution ; aperture oval, 



