282 FAUNA HAWAITENSTS 
must be noted that the median teeth have a single outer cusp, while Aa/e//a has both 
outer and inner cusps; this latter characteristic is, however, not present in S7zfa/a. 
Katella has few teeth in the row, Sztada many ; 33 : I : 33, 153: I : 153, respectively. 
A more important link with the genus Sz¢aZa is displayed by the presence of right and 
left shell lobes, which Kadze//a does not possess; the close parallel lines of contraction 
across the right shell lobe shew that it has considerable extension in life. Stoliczka 
also mentions in Sz¢ala tzfuda the swollen uterus and the advanced state of development 
of the ova; pointing to similar embryonic stages in these molluscs. Yet another 
character is in common, namely, the absence of any amatorial organ. The male organ 
of the present species is also slightly different; I am unable, having only one specimen 
to dissect, to examine this in section. 
“The jaw is very thin and delicate, and so colourless that its detection and ex- 
traction are very difficult. It has a well defined central projection on the cutting edge. 
“ The generative organs (Plate XII. figs. 3, 3a) cannot be described so fully as one 
would wish, owing to the expanded state of the uterus. The hermaphrodite duct and 

albumen gland were perfect: and the male portion thence complete. The prostate—as 
it is called by Semper, shewn in his figure of Jecrocystis myops as a loose fringe-like set 
of convolutions—appears in this species as a closely packed and thickened mass of 
oblong form, flattened on one side, where the oviduct would be lying attached if perfect. 
The vas deferens is given off at the anterior end. The penis is a thickened muscular 
tube, broad and bulbous below, tapering upwards to where the very short thickened 
retractor muscle is given off: the vas deferens at this point has three sharp con- 
volutions ; seen with transmitted light a short, sharp, ‘kink’ occurs in the bulbous 
portion near the generative aperture. 
“The sculpture of the shell, magnified about thirty times, presents a very fine, 
regular, slightly wavy, longitudinally striated surface; this striation is strongest near 
the suture, becoming finer outwards. There are about 11 striae to ‘003 inch. The 
most advanced embryonic shell consists of 2} whorls, the sculpture is well shewn on it. 
‘The point now to be solved is whether we are to retain this species in M2crocysts. 
Mr Sykes regards’ J. ornatella as the type of the genus; this was also the opinion of 
H. Nevill. Further Mr Sykes goes on to say ‘ Now these small Zonitoids [7.e. those 
of the Hawaiian Islands] hardly fit into the same genus as this species and therefore 
some other generic title is required for them.’ The anatomy now described, shews, for 
many reasons, that the shell cannot be placed in J/acrochlamys as Mr Sykes, guided by 
the shell characters, proposed. In my opinion it is undoubtedly close to Kadiedla, 
still closer to Sz¢a/a, and yet there are sufficient differences in the generative organs to 
separate this Hawaiian form from both. If we take the shell alone into account, the 
sculpture presents one character, viz. fine, close longitudinal striation, not found in the 
Indian species of Sz¢a/a, in which the general surface is smooth, with spiral liration. 
' P. Malac. Soc. London, 11. 1896, p. 31. 
