FIBULA. 175 
Shell elongate, conical, spiral angle regular; whorls ten to twelve, flat to 
subconvex, narrow, smooth; a slightly raised belt in the upper part of each 
whorl gives a faint appearance of turriting ; suture close. 
Body-whorl rather short, subtumid, rounded, and smooth. In some specimens 
there is a slight indication of an umbilicus ; columella short and straight. Aperture 
subquadrate, with a thin rounded outer lip and a square base strongly notched at 
its junction with the columella. 
Relations and Distribution—The small size of all specimens hitherto found 
may be deceptive, since Gasteropoda in the Lincolnshire Limestone are usually 
small. The narrowness of the whorls seems to distinguish it from any other 
species hitherto referred to Fibula. Somewhat rare in the Lincolnshire Limestone 
at Weldon. 
105. Frevuna canna, Hudleston, 1884. Plate XI, figs. 2 a, 2 b. 
1884. Crrrrurum (?) caninum, Hudl. Geol. Mag., dec. iii, vol. i, p. 107, pl. iv, 
figs. 1 and 2. 
Description : 
Length of a large specimen : : . 51mm. 
Width : : . 21mm. 
Ratio of body-whorl ms entire shell . « po 2100; 
Spiral angle . : 32°. 
Shell subelongate, conical, with Ropes a amenare umbilicus; spiral 
angle regular. Whorls about ten, smooth, somewhat tumid towards the centre, 
and separated by a suture of moderate depth. Wavy longitudinal lines, appa- 
rently lines of growth, are seen in some specimens. 
Body-whorl rather more than one-third the total height of the shell, rounded, 
and smooth; aperture quadrate, with some traces of an anterior notch. Other 
indications wanting. 
Relations and Distribution.—When one has to deal with a doubtful species it is 
as well to place it in a doubtful genus. The nature of the matrix may have 
somewhat modified the available specimens. The number of whorls seems to be 
few for such large shells. ’. canina has some resemblance to Fibula (Chemnitzia) 
phasianoides, M. and L. (pl. ix, fig. 5), whilst it has less resemblance to the types 
of Piette. We are also reminded of Fibula Gastaldi, Gemm., (‘ Faune Giuresi,’ 
p. 281, pl. 22, fig. 55). Rare in the Yorkshire Dogger. 
