246 REV. E. B. WATSON ON THE 



ruddy-brown band on the lower two spiral threads. Spire fine 

 and regular with very straight outlines — the extreme tip though 

 small ends somewhat abruptly and flatly. Whorls 10, flat on 

 the side, of very regular increase. Suture neither broad nor 

 deep, but well marked — from the distinct though small con- 

 traction of the lower part of the superior whorl. Mouth small, 

 oval, angulated above, and having a small shallow gutter at the 

 point of the pillar. Outer lip flatly and regularly arched ; the 

 tubercles of the exterior sculpture very slightly and indeed rarely 

 affect the inner surface. Inner lip thin but distinct, turned 

 back and appressed on the pillar, where it is perpendicular with 

 a slight twist resulting in a small tuberosity in front at the 

 upper edge of the gutter. — L. 0*24. B. O08. 



This is a much slimmer form than B. reticulatiim, da Costa, 

 with also a blunter apex : slimmer, too, than Bittium incile, Wats., 

 and with much straighter contours and narrower base, and with 

 smaller tubercles on the more numerous spirals. The species has 

 a far-off but yet distinct suggestion of a Cerithiella. Very rarely 

 a feeble varix appears on the last whorl. 



This species I found abundantly on the south coast of Madeira 

 and at Porto Santo, but it does not seem to have presented itself 

 to other collectors. 



14. Bittitjm incile, n. sp. (Figs. 14 & 14 a.) 

 Shell a tall narrow cone, but somewhat coarse both in 

 sculpture and in its proportions ; its contour-lines are very 

 slightly curved, and from the periphery the base contracts slowly ; 

 its whorls are glossy, strongly defined, and almost turreted. 

 Sculpture : the bluntly rounded apical whorl is microscopically 

 and very faintly spiralled and longitudinally marked ; the three 

 following whorls have 2 and the succeeding four whorls 3 strong 

 spiral ridges ; on the base below the periphery there are 3 of 

 these ridges, the last forming the bulge of the column ; none are 

 varicose, they are all strong but not very projecting, the appear- 

 ance of prominence which on the spire they present being largely 

 due to their being set with coarse rounded tubercles some 16 on 

 each ridge, arranged in very regular longitudinal lines across the 

 whorls ; the longitudinal grooves which part them are broader 

 but hardly so deep as those which separate the spiral ridges ; the 

 whole surface of the shell is microscopically but roughly fretted 

 with sharpish longitudinal and ruder spiral lines ; on the base 



