64 



* B. INCRASSATUM. B. Minimum. Turt. Lin. B. Mi- 

 nutum. Pen. Brit. Zo., vol. 4, pi. 79, inner angle beneath 

 the left hand. B. Macula. Mont. Test. Brit., vol. 2, 

 p. 241, pi. 8, fig. 4. Nasa I. Flem. Brit. A., p. 340. 

 Common. 



Naturalists seem to have overlooked, or considered perhaps 

 as a younger state, of this shell, one that seems to have good 

 claims to be regarded as a distinct species. Its general form 

 is like that of B. I. but the whorls and ribs have a more 

 inflated appearance. This is more especially the case with 

 the outer lip, which, viewed from above, shews more dilated ; 

 but observed below, that which in the one is more solid and 

 tuberculated, is in the other hollowed out, inflected and thin : 

 leaving the aperture more than twice as large, in shells of 

 equal magnitude. The outer edge is also more circular, 

 advances further up the whorl, and closes more over it. 

 There is no plait over the columella, the pillar of which is 

 less solid, and without the perpendicular line seen on B. F. 

 The substance also is more thin. It is scarcely common, but 

 occurs in similar situations with the other, along our coast. 

 B. BREVE? A small shell which answers best to the ob- 

 scure species referred to by Montagu, vol. 1, p. 2o0, and 

 by Fleming, p. 344, as described by Walker under this 

 name, is among the small collection I was favoured with 

 by Mr. Curnow of Newlyn ; who obtained it near the 

 Land"s-end. The length of the specimen is about a line; 

 the greatest breadth something less. The whorls five, 

 rounded, separated by a well marked division ; summit 

 rather blunt; upper whorls smooth, perhaps from having 

 been rubbed : the two lower whorls prominently ribbed : 

 the ribs wide, high, regular, rounded : those on the lower 

 whorl ending on a circular rib, which begins at the union 

 of the outer lip with the body, and passes round obliquely 

 downward. This lower whorl is proportionately large; 

 aperture moderate, outer lip simple, canal short, and 

 formed as in the genus Nasa of Fleming. Colour white. 



TEREBRA. 



GENERIC CHARACTER: The shell lengthened, tur- 

 reted, very pointed above, aperture longitudinal, many 

 times shorter than the spire, and notched at the hinder 

 part of the base. Bottom of the Columella twisted or 

 oblique. 



T. PERVERSA. Turbo Punctatus. Turt. Lin. Murex 

 Adversus. Mont. Test. Brit., vol. 1, p. 271. T. P. 

 Flem. Brit. An., p. 347. Montagu found it sparingly. 



COLUMELLARIA. 



No canal at the base of the aperture; but a more or less 

 distinct subdorsal notch, and plaits on the columella. 



