CYMBIUM. 
Puate XXIII. 
Species 14. (Mus. Cuming.) 
Tn this front view of the specimen of Qymbium Neptuni 
figured in the preceding Plate, it may be observed that the 
spire and apex are wholly concealed by the over-coiling of 
the last whorl. This is not always the case. Sometimes 
the spire is a little exserted, and the last whorl, not reach- 
ing over it, forms a more or less excavated channel round 
the apex. This would naturally be the case in a speci- 
men of more oblong form coiling upon a more lengthened 
axis. The species in this state is Mr. Broderip’s Cymba 
Tritonis. Dy. Gray, as I have already stated, unites Mr, 
Broderip’s ©. patula with C. Neptuni, considering it to 
be the young; but it will be seen on reference to our 
figure of Cymbium patulum, Plate XXV. Fig. 16 a, 0, that 
the shell is more contracted towards the apex, and there 
is One plait less on the columella, neither of which charac- 
ters are peculiar to Cymbia of immature growth. 
March, 1861. 
