90 STUDIES ON AUSTRALIAN MOLLUSCA, 



farther apart. The lowest overhangs the umbilical fissure. 

 Interstitial threads develop in the two lowest furrows. All the 

 ridges and furrows are crossed by fine, sharp, obliquely ascending 

 threads, of which there are on the body whorl about thirty-three. 

 The major spiral, and minor transverse, lines enclose deep square 

 pits; at their intersection arise sharp little prickles. A corres- 

 ponding sculpture occurs on the upper whorls and fades gradually 

 away towards the apex. Aperture oblique, almost D-shaped, but 

 rounded off at the angles. Outer lip sharp, frilled by the sculpture. 

 Inner lip distant from the whorl, nearly straight, edge a trifle 

 curled, broadened at the anterior corner, where the circum-umbilical 

 ridge arches in to meet it. Here is the shallow impression of a 

 rudimentary siphonal notch. Umbilicus a long, deep, narrow 

 cavity whose inner wall is smooth. Length 4, breadth 2-5 mm. 



Hob. — Off Bet Island, Torres Straits; two specimens dredged 

 by Mr. J. Brazier in 1 1 fathoms. 



Type to be presented to the Australian Museum. 



The genus Couthnuyia (Ann. Mag. N.H. ser. 3, v., May, 1860, 

 p. 410) has not been previously seen in Australian waters. 



Menon, gen.nov. 



A genus of the EuHmidce. Shell perforate, solid, dull, com- 

 pressed from back to front, and distinguished especially by a 

 continuous series of varices on each side. 



Type M. anceps. 



Menon anceps, sp.nov. 



(Plate iii., figs. 5, 6 & 7.) 



Shell elongate-ovate, compressed from back to front, opaque, 

 more dull and thick than is usual in the Eulimidce. Colour dull 

 pale yellow. Apical whorls two and a half, first planulate (?a 

 plug), adult whorls four, each successive whorl becoming pro- 

 portionately longer, the last exceeding half the length of the 

 shell, each sloping to a faint shoulder angle, slightly curved on 

 the side and roundly incurved at the base. Sculpture: fine spiral 



