336 EEV. B. BOOG WATSON ON THE 



Mouth oval, direct, pointed above, prolonged into a long, oblique, 

 narrow, open, twisted canal, which is a good deal reverted in front. 

 Outer lip narrow, blunt, very finely crenulated on the edge ; it is 

 very regularly arched, and not at all patulous till it approaches 

 the canal, where it is increasingly patulous to the point ; in this 

 part of its course its curve is concave. Inner lip — there is a 

 diffuse white callus above ; its whole curve is concave to the edge 

 of the canal, where it is obliquely truncate, sharp, and twisted ; 

 its edge in front is extremely narrow and sharp ; there are two 

 slight, oblique, white teeth close to the pillar-edge. Operculum 

 oval, with a pointed, almost claw-like apex ; it is thinnish, horny, 

 sharp-edged, strongly marked with lines of growth on its outer 

 face, and having on its inner face a broad, flat, glossy swelling 

 along its outer margin, H. 4 in. B. 1"44. Penultimate whorl, 

 height 0-7. Mouth, height 2-2, breadth 0'78. 



This is an exceptional form, having the apex of a Fusus (a 

 feature shared by Fas. coronata, Lam.), and having a long, thin, 

 bent canal and no longitudinal ribs or tubercles, — features which, 

 though present in some species (as, for instance. Fas. tulipa, L., 

 and F. jj'^pil'losa, Sow.), are uncommon, especially united. It 

 is also peculiar from the slimness of its form and the thinness of 

 its shell. It is not a Ttirlinella, for its pillar-teeth are only 

 two, are slight and very oblique ; the operculum, too, is small 

 and thin. No Volute has so high a spire, so small a mouth, so 

 long and narrow a canal, nor an operculum of the form which 

 this presents (see Journ. de Conch. 1877, p. 97). 



Fasciolaeia maderensis, n. sp. 



St. VII. p. Feb. 10, 1873. Lat. 28" 35' N., long. 16° 5' W. 

 Off Teneriffe. 78 fms. Coral. 



Shell. — Biconical, fusiform ; as the shell lies on its mouth, the 

 periphery in the centre of the back is exactly in the middle of the 

 shell's length ; solid, angulated, rough and opaque ; ribbed and 

 spirally ridged, with an umbilical chink. Mouth angularly pear- 

 shaped, with a long, narrow, slightly oblique canal ; toothed on 

 the pillar and within the outer lip. Epidermis strong and horny. 

 Operculum dark brown and claw-shaped. Sculpture. Longitu- 

 dinals — there are 8 to 10 broad, low, rounded, irregular ribs ; 

 they diminish in number vip the spire ; they scarcely appear above 

 the suture or on the base ; the lines of growth are numerous, 

 unequal, sharpish, but rather coarse. Spirals — there are spiral 



