THE MOLLUSCA—HEDLEY. 433 
only a form of C. morus, Lamk.” Tryon, ever ready to reduce 
synonymy, agreed in this view. Whatever may be deemed the value 
of C. breve, it cannot be adjudged an absolute synonym of C. morus. 
The type of C. breve came from Tongatabu. The shell does 
not seem to have been again observed, 
CERITHIUM SPICULUM, Sp. nov. 
(Fig. 21). 
Shell narrow, subulate, with a sharply-pointed 
spire and a rounded base. Colour dull white, dis- 
tantly, faintly, irregularly, and minutely spotted 
with chestnut. Whorls eleven, slowly increasing, 
somewhat turreted, flattened. Sculpture—on the 
uppermost whorls the spiral ridges are tuber- 
culated by longitudinal plications which rapidly 
diminish as the growth proceeds. On the last 
whorl their influence is barely perceptible in faint, 
shallow, longitudinal undulations. A stout varix 
occurs a third of a whorl behind the aperture ; 
from four to ten, raised, spiral cords encircle each 
whorl, in the interstices of which are fine spiral 
threads. Aperture perpendicular, oval; outer lip 
straight and sharp; canal very -short, turned 
abruptly outwards. Length 11, breadth 4 mm, 
Two specimens were obtained in the outer beach of Nukulailai. 
This form appears allied to C. lactewm, Kiener,* from which it 
differs by smaller size, narrower outline, and absence of granula- 
tions. 
CERITHIUM STRICTUM, sp. nov. 
(Fig. 22). 
Shell narrow, elongate, tapering in a slender spire 
and blunt anteriorly. Colour white, irregularly 
longitudinally splashed with chestnut. Whorls seven, 
the upper angled, the last straight. Sculpture— 
round the angle of the upper whorls runs a line of 
tubercles, of which eleven occur on the penultimate. 
Very slight longitudinal undulations, hardly to be 
called ribs, extend from these tubercles across the 
whorl ; both vanish before attaining the last whorl. 
This latter is girt with about twenty, sharp, revolv- 
ing ridges, of which the central is largest and 
corresponds to the tuberculated angle of the earlier 
whorls ; the rest vary in size and spacing, the basal 
ridges being least and closest; the upper seven ascend »W~ 
the spire. A large varix is behind the aperture, and a Fig. 22. 
* Kiener—Coquilles Vivantes, Canaliferes i., (n.d.), p. 58, pl. vii., figs. 
3, 3a. 
Dp 
