PILIDIUM. 441 



P. FULvuM, Miiller. 



Plate LXII. f5g. G, 7, and (Animal) Plate A. A. fig. 3. 



Patellafulva, Muller, Prod. p. 237 ; Zool. Dan. pi. 24, f. 1, 2, 3.— Gmelin, 

 Syst. Nat. p. 3712.— Bosc, H. N. Coquilles, vol. iii. p. 209.— 

 DiLLW. Recent Shells, vol. ii. p. 1053. — Wood, Index Testae, 

 pi. 38, f. 83. 

 „ Forhesii, Smith, Mem. Werner. Soc. vol. viii. p. 107, pi. 2, f. 3. — 

 Brown, Illust. Conch. G. B. pi. 57, f. 3, 4. 

 AcmcBafulva, Hanley, Brit. Mar. Conch, p. xxxii. 

 Teclura fulvu, Searles Wood, Crag Mollusca, pt. i. p. 161, pi. 1 8, f. 7, a, b. 



This beautiful little shell is, both within and without, of 

 a pure reddish orange colour, but varies in intensity of hue, 

 as well as in occasionally being only rayed with orange 

 upon a paler and more fulvous ground, although in general 

 its tint is uniform. It is thin, depressed conical, and 

 rather inequilateral. The vertex is by no means elevated, 

 and is curved greatly forward, so that the descent from 

 it anteriorly is rather abrupt, whilst the slope posterior- 

 wards is gently arcuated : there is no particular lateral 

 compression. The base is more or less elliptical, but rather 

 broader behind, and rather more obtuse in front. The 

 outer surface is adorned with minute radiating, elevated 

 lines, which are numerous, but not closely disposed, and 

 are rendered granular by the crowded decussation of still 

 finer and almost microscopical lamellar lines. The basal 

 margin is acute, and entire, or very nearly so. 



One of our largest specimens only measures a quarter of 

 an inch in length, and but slightly exceeds two lines in 

 breadth. 



The animal is white. Its head is not very large in pro- 

 portion to the body, and terminates anteriorly and below 

 in a short puckered muzzle. The tentacula are rather short 

 for the tribe, and obtuse ; they have swollen bases, but 



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