MANGELIA. 467 



raised sulci, usually from seven to fourteen, the larger num- 

 ber in the more closely ribbed forms. The posterior sinus 

 of the right lip, the white margin of which is bevelled to 

 a sharp edge, and is a little jagged by the external sculp- 

 ture, is narrow and short, yet distinct from its abruptness. 

 The columella is well rounded, and not much curved or 

 sinuated. 



Figure 5 of Plate OXIII. represents the F. asperrimus 

 of Brown, which we regard as an albino variety of this 

 variable species. It is devoid of colour, exhibits a larger 

 and more prickly style of cancellation, there being but 

 fourteen or fifteen longitudinal ribs on the principal turns, 

 and has its whorls rather more flat-topped than usual. In 

 sculpture it approaches the reticulata * of Philippi, but is 

 much more produced, slender, and rostrated than are his 

 typical examples of that shell. We have received this form 

 from Cornwall (Cocks), and Cork Harbour (Humphreys). 



The animal, a fine example of which we have had an 

 opportunity of examining when dredging off the Isle of 

 Man, is white with flaky specks, the siphonal tube only 

 being slightly tinged with purple. Its tentacula are rather 

 long and subulate, their thickened eye-bearing portions 

 occupying two-thirds of their length. The foot is ample, 

 truncated and auriculated in front, triangular and rather 

 pointed behind. There is no trace of an operculum. 



This species is distributed generally on the western and 

 southern sides of the British Isles, but sparingly and more 



* We are disposed to believe that the PI. Cordieri of Payraudeau (Moll. 

 Corse, p. 144, pi. 7, f. 11; Kiener, Coq. Vivant. pi. 24, f. 1. — F. ricdis, 

 ScAccHi, Fauna del Napoli, p. 12, f. 17. — PL purpurea, Phil. Moll. Sicil. vol.ii. 

 p. 165), and possibly, also, the P. reticulata of Renieri (Philippi, Moll. Sicil. 

 vol. i. p. 196; vol. ii. p. 165. — Reeve, Conch. Icon. vol. i. Pleur. pi. 15, f. 122) 

 are only coarsely sculptured varieties of this beautiful shell. We have not as 

 yet, however, observed these forms on our own coasts. 



