188 WORMS. TESTACEA. 59. Helix. 



/;,*// 3 tenth-: of an inch wide, pellucid, yellowish-horny, equal 

 and concave on both sides : apfrture oval. 



505. H. contort a. Chesnut, liar, equal both side??, slight- 

 ly umbilicatc : aperture linear-lunate, acute at the 

 ends. 



Donovan t. 99. Da Costa t . .4. /. 1 1 . 



Shell 2 tenths of an inch wide, horn-colour or rufous, with ^ or 

 6 whorls concave each side : aperture refenibling the moon in its 

 first quarter. 



506. H. alba. Pale horn-colour, flatfish,, finely striate,. 

 umbilicate both. side* : aperture dilated luuuie. 



Montague Krit. shells p. 459. Suppl. t. 25. /. 7. 



Simlt a quarter of an inch long, pellucid, covered with a hrown 

 skin, above Battish beneath convex: zvltorls 4, cylindrical, minutely 

 striate longitudinally and acrofs. 



507. Il.fontana.. Horn-colour, flafy obtusely carinafe,. 

 umbilicate at the base, with 3 whorls coin ex on both 

 sides : aperture semiovate. 



Montague Brit. Shells, p. 462. tab. 6./. 6". 



Skell hardly 2 tenths of an inch wide, perfectly fmooth, refc rn- 

 bling the Nautilus lacustris, but is less convex on the upper-sidt , 

 and is without the partitions within : aperture half oval, pointed at 

 top, dilated towards its connection with. the shell. 



508. H. pnlwlosa. White, smooth, flat, umbilicatc, a 

 little convex above: aperture nearly orbicular,. with 

 a thick reflected margin. 



Linn. Tranfact. viii./>, 193. tab. \.f. 5.. 



2. With the whorls striate or membranaceously annulate. 

 iightfoot Philos. Trans. 76. t.^.f. 1-4. Turbo. 



Sheila, tenth of an inch wide, with 4 whorls, fubpellucid, with a 

 clear white opake margin to the aperture. 



509. H. Ericetorum. Fiat, whitish with a brown splra 1 

 band or bands, and very large perforation. 



J3r. Zool. t. 85. /. 12?. Donov. t. 151. /. 2. Da Costa t. $.f. 8. 



Shell 3 quarters of an inch broad, one quarter high, white or yel- 

 lowish white, with fometimes feveral bands on the large whorl : 

 aperture fuborbicular, with a thin margin hardly reflected. 



510. H. cingenda. Yellowish-white with brown spiral 

 bands, with a convex obtuse spire, slightly umbili- 

 cate : aperture suborbicular. 



Br. Zool. t. 8,5./, 133. Montague Suppl. t. 24. /. 4. 



Shell 3 quarters of an inch wide, half an inch high, fmooth, with 

 5 whorls, the larger-ones a little flattened at top ; the upper-part 

 with broad bands, and numerous darker interrupted ones ; beneath 

 with a single ciiiate band ; mhorls a little raised, finely reticulate, 

 dark chocolate-brown at top: aperture with a thin margin. 



511. XLvirgata. White with a purplish brown band, 

 convex: aperture suborbicular, with a fine white 

 raised line round the margin within. 



ST. Zool. t. 85. /. 133, A t . Donovan i. 65. Da Corta t. \.f. 7. 



SM! hSf an inch wide, with a single fpiral band from the bafe 

 to the tip, and ?feveral circular lines of the fame colour round the 

 bafc, within pale purplish-brown with a white raifed thread-lik* 

 line round the margin; fometimes rufous or pale with a white 

 band : perforation narrow, deep. 



512. II. caperaia. White with purplish-brovwi bands, 



