PACE: ANATOMY OF VOLUTA MUSICA, LINN., ETC. 25 
value of the radula in the Prosobranchiata has been considerably 
overrated ; and that the more important characters are probably 
those which are afforded by the alimentary canal with its appended 
glands, and by the nervous system. In the morphology of its 
alimentar y apparatus, V. musica is in complete accord with what is 
known in other forms referred to the Volutide; while, as regards 
its nervous system, the presence of a definite right pleuro- visceral 
connective is suggestive of a more primitive condition than is met 
with in any known form other than J/elo Neptuni (1, figs. 74 and 75). 
Lyrta peExicrosa, Montrz. 
The anatomy of this form was investigated by P. Fischer (4); but, 
although he would seem to have had ample material, his description is 
anything but complete. 
Leiblein’s Gland.—F¥ischer makes no mention of the existence of an 
cesophageal cecum in Lyria: can it be that it is absent or insignificant 
in this form; or, may it not rather be, that what is described as the 
stomach is in reality formed by the convoluted Leiblein’s gland bound 
up with the gut? 
Salivary Glands —Fischer describes the tubular salivary glands, 
which he states open one on each side! of the radula-sac, but he says 
nothing of the normal acinose ones, which are, presumably, also 
present. 
Radula.—Fischer’s figure of the radula is a somewhat unsatisfactory 
one, but the enlarged, straight base of the tooth, and the small and 
equal size of its cusps, are rather suggestive of an approximation 
towards the V. musica type. 
Neprongorsis Gitcuristt, Sby. 
My specimen, like that described by Martin F. Woodward (13), 
was afemale. It was preserved in spirit, had been removed from its 
shell,* and was minus the visceral sac when I received it. Otherwise, 
notwithstanding the fact that the animal had been macerated for 
a fortnight in order to facilitate removal from its shell, the tissues 
were in fairly good condition for dissection. 
External characters of Animal.—The head is produced into two 
enormous, expanded, tentacular lobes: these, although flattened, are 
stout and. solid, and haye their borders rounded ; they are separated in 
the middle line by a deep notch, which is continued over the dorsal 
surface of the head as a shallow median groove. It is noteworthy 
that the head is not quite symmetrical, the right tentacle, and more 
particularly the eye-stalk, being more dev eloped than the left. The 
general shape of the head is shown in Fig. 5, in which the position of 
the rhynchostome, or false mouth, is also indicated. 
1 It is probable that the tubular ‘salivary glands’ in all cases open in advance of 
the radula-sac, and not at its posterior extremity. 
2 The register number of the shell, which is in the British Museum, is ‘‘1901: 
10": 29° IM} 
