188 WORMS. TESTACEA. 59. Helix. 



Shelly tenths of an inch wide, pellucid, yellowish-horny, equal 

 and concave on both sides : aperture oval. 



505. H. contorla. Chcsnut, flat, equal both sides, slight- 

 ly umbilicate : aperture linear-lunate, acute at the 

 ends. 



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



Shells tenths of an inch wide, horn-colour or rufous, with 5 or 

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

 first quarter. 



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

 umbilicate both sides : aperture dilated lunate. 



Montague Brit, shells p. 459. Suppl. t. 25. /. 7. 



Shell a quarter of an inch long, pellucid, covered with a brown 

 skin, above flattish beneath convex: whorls 4, cylindrical, minutely 

 striate longitudinally and acrofs. 



507. H.fontana. Horn-colour, flat, obtusely carinatc, 

 umbilicate at the base, with 3 whorls convex on, both 

 sides : aperture semiovate. 



Montague Brit. S-hells. p. 462. tab. 6./. 6. 



Shell hardly 2 tenths of an inch wide, perfectly fmooth, refem- 

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

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

 top, dilated towards its connection with the shell. 



508. H. paludosa. White, smooth, flat, umbilicate, a 

 little convex above : aperture nearly orbicular^ with 

 a thick reflected margin. 



linn. Tranfact. viii.^, 193. tab. 4./. 5.. 



2. With the whorls striate or membranaceously annulate. 

 Lightfoot Philos. Trans. 76. t. 3./. 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. Flat, whitish with a, brown spiral 

 band or bands,, and very large perforation. 



Br. Zool. t. 85./.. 122., Donov. t. 151./. 2. . Da Costa f. 4./. 8. 



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

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

 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. 



Sr. Zool. t. 85./, 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 ciliate band ; whorls a little raised, finely reticulate, 

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



511. H.virgata. White with a purplish brown band, 

 convex: „ aperture suborbicular, with a fine white 

 raised line round the margin within. 



Br. ZoolJ*8§*f. »33,.A. \Donpyaji t f 6$.. Da Costa t. 4./. 7. 



Shell half.ajiJnfh^wide^wJt^ single,, fpijral band from the bafe 

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

 ba/e, within pale purplish-brown, w.it<h. a white rajfctl 1 thread-like 

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

 band : per/oration narrow, deep. 



512. II. caperata. White with purplish-brown bands, 



