50 LAND AND FRESHWATER 
genus, for nothing like them is to be found in either Arion or 
Limax. The teeth of this species do not certainly agree with the 
radula described and figured by Heynemann; there is a similarity only 
so far as the straight form of the central teeth ; but he distinctly says 
all the laterals are straight and with no basal cusp, and he thus 
figures the 54th of giganteus (Taf. 1. fig. 1 f); and the 40th tooth of 
A, schlagintweiti has this small basal tooth, but he adds that on the 
extreme laterals it disappears. There were 106 rows in a very 
complete radula I got out, arranged thus :— 
05.1 . 55. 
The jaw and radula are found to be like that of Geomalacus, to 
which genus Anadenus has, in this respect, some affinity (vide 
Plate XII. figs. 4, 4a, 46). 
Generative organs (Plate VI. fig. 7). The ovotestis (0.t) is bilobed, 
and situated quite within the folds of the liver-lobes, and is of a 
pale green tint ; the hermaphrodite-duct is rather long, a good deal 
convoluted near its lower end, but is straight for a short distance 
before it joins the albumen-gland ; this organ is very large, and lies 
on the left anterior side of the animal. The oviduct is of the usual 
form. The vas deferens (v.d) is given off just above the duct of the 
spermatheca; it is very long, and is coiled on itself at one point 
about the middle of its length; this coil lies well forward on the left 
anterior side behind the left tentacle, and doubles back on itself, 
and passing up the side of the male organ enters it at the hard 
rounded posterior end, close to where the retractor muscle is given 
off. The attachment of this muscle is at the posterior margin of 
the mantle-cavity ; it is so much contracted in the spirit-specimen as 
to bring the posterior end of the penis close up to it and the attach- 
ments of the eye-tentacles, &e. The spermatheca (Sp) is about the 
same length as the penis, pear-shaped. 
All the six specimens sent to me from Simla (where they were 
collected during the rains in June and July, at the period when they 
are in full activity and development) show the generative orifice 
much expanded, with the male organ partly protruding (Plate VI. 
figs. 1 & 4). This discloses the existence of several small, sharp, 
curved spines fixed upon the surface of this reversed portion. On 
further opening the generative orifice (Plate VII. fig. 6), these 
curved spines were discovered to be only the most advanced of a 
much greater number arranged in two parallel rows (d@) and ex- 
tending upwards, gradually lengthening, and forming part of a very 
complicated and beautiful arrangement of far longer and stronger 
calcareous (c)spines. The frontal side of this curious apparatus was 
found covered by a large and longitudinally perforated plate (a), 
which had evidently been built up by the union together at their 
upper and lower extremities of originally parallel spines. On the 
posterior side of this basal portion of the male organ one very 
large, long, spear-shaped spine (c) was situated; this measured 8 mm. 
in length. The whole of this complicated structure must therefore 
be regarded as representing the simple dart-sac with a single dart, 
