196 WORMS. TEjSTACEA. 61. 62. 



Donovan t. 16./. 1. Da Costa p. 51. f.4./. 4. 5. 



Shell near half an inch long, convex, with the fpire a little pro- 

 minent, covered with a brown skin, the first whorl very large, 

 fometimcs faintly wrinkled i lip thin, fringed by the skin j pillar 

 thick, white. 



571'. N. littoralis. Globular, thick, smooth with a flat 

 spire : lips toothless. 

 Br. Zool, t. 87./. 143. Donov. t. 20./. a. Da Costa t. 3./. 7. 



Shell 3 quarters of an inch high, nearly as much broad, thick, 

 strong, various shades of yellow red or brown, often variegated in 

 numerous varieties, fometimes banded, with 4 or 5 whorls, the 

 first very large : aperture fuborbicular, or inclining to oval, with 

 the margin thickened within. 



572. N. pellucida. Pellucid, smooth, with 3 whorls. 



Adams Linn. Trans, iii. />. 67. Minute. 



2. Subpellucid, fmooth, with 2 whorls. 

 Adams Linn. Trans, iii. p. 67. N. alba. 



The two last may probably be only the young shells of 

 N. glaucina. 



61. HALIOTIS. Sea ear. 



573. H. tuberculata. Dull rufous-brown, suboval, trans* 

 versely rugged and tubercled on the back. 



Br. Zool. t. 88./. 144. Donov. t. 5. Da Dosta t. 2. /. 1. 2. 



Shell 3 or 4 inches long, 2 or 3 wide, fometimes mottled, striate 

 longitudinally, wrinkled tranfverfely, with a few raifed tubercles, 

 perlaceous within, open near the whole length, with a thin irre- 

 gular outer margin : lip white, inflected : spire a little raifed : per* 

 /orations about 20-28, of which 5 or 6 are open. 



62. PATELLA. Limpet. 



A. Furnished with an internal lip. 



574. P. cldnensis. Subconic* smooth, entire* whitish, 

 internal lip lateral. 



Donovan tab. 129. P. pallida. 



Shell above half an inch wide, not fo much high, fuhconic, whitish 

 or pale brown, entire at the margin, with the crown central end* 

 ing in a fmall whorl, concentrically wrinkled and rough with 

 fmall concave fcales j within glossy, white, with a broad fjat thin 

 fub-fpiral lip near the margin. 



B. With the margin angular y or irregularly toothed, 



515. P. vulgata. With about 14 obsolete angles, and 

 dilated acute margin. 



Br. Zool. t. 89./. 145. J 46. Donov. t. 14. Da Costa t. \.f. 1. 2. 8. 



Shell 2 inches or more wide, conic or a little depressed, dirty 

 green or brown, fometimes varied with ferruginous or brown 

 marks, finely striate longitudinally, within glossy, yellowish 

 horn-colour, whitish at the bottom : crown rather obtufe, nearer 

 the finalier end : margin fometimes indented, fometimes entire, 



C. With a pointed recurved crown. 

 578. P. Mitrula. Entire, subconic, white, with concen- 

 tric imbricate wrinkles. 



Montague Brit. Shells p. 486. 1. 13./. 9. P. antiqu^a.. 



Shell about half an inch wide, thick, opakc : aperture oval: 

 crown recurved, nearer one end. 



