316 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 
colour; the waviness points merely to the foot being much longer in 
life. Similar contraction is shown and described as a specific character 
on the edge of the mantle. This can, l imagine, be only a post mortem 
state due to great contraction, and in all probability would not be seen 
in the living animal, or in one killed in water and then put into spirit. 
However, there is no necessity for the creation of another genus, viz. 
Tsselentia, for Bornean slugs. All the species I have as yet seen fall 
into two well-marked divisions.:— 
1. Damayantia, with its very peculiar radula (Pl. XI, Figs. 1g and 2c). 
2. Collingea, formerly Microparmarion, with a radula of the type 
of Parmarion, 
Asselentia is more probably a subgenus of Damayantia, if that genus 
is to be subdivided, and is distinguished by having the mantle- ‘lobes 
less developed, while those of D. dilecta and D. carinata have coalesced 
or grown together, as shown in Pl. XI, Figs. 1, la, 2, and 2a. 
Neither Mr. Collinge nor myself have had the advantage of seeing 
any of these Bornean slugs alive, and it is not a matter of any very 
ereat importance whether D. Smithi, D. plicata, and D. globosa are 
different species or not. 
REFERENCES. 
1, Issel (A.).—*‘* Molluschi Borneensi’’: Ann. Museo Civico Genova, 
vol. vi (1874), pp. 366-486, pls. iv—vil. 
. Collinge (W. E.) and Godwin- Austen (H. H.).—‘ On the structure 
and affinities of some new species of Molluses from Borneo” 
Proc. Zool. Soc., 1895, pp. 241-250, pls. xi—xiv. 
3. Godwin- Austen (H, H.).—‘‘ Land and Fresh-water Mollusca of 
India,” vol. 1, pt. 8 (1898), pp. 55-60, pls. Ixxili-lxxv. 
4. Collinge (W. #.).—‘‘ On the anatomy of a collection of Slugs from 
North-West Borneo”: Trans. Roy. Soc. Edinburgh, vol. xl 
(1902), pp. 295-312; 3 pls. 
Simroth (H. R.).—** Ueber die Gattungen Parmacochlea, Parmarion, 
und Iieroparmarion”?: Zool. Jahrb., Bd. xi, Syst. (1898), 
pp. 151-172, pl. xv. 
EXPLANATION OF PLATE XI. 
Damayantia carinata. 
Fic. 1. Animal, viewed from the right. side. x 2°3. 
la. Animal, viewed from the left side. x 2°38. 
5, 16. Animal, viewed from above, the mantle and shell removed to show visceral 
sac. x 4°65. 
5, le. Left side of head, showing mouth and the three peripodial grooves. x 8. 
», 1d. Part of the generative organs. x 4:5. 
5, le. Portion of a spermatophore. x 58. 
55 6Lfe daw. x 24. 
5, lg. Median, adjacent, and three outside teeth of the radula. x 1,100. 
Damayantia Smithi. 
Drawn from a specimen in Nat. Hist. Museum, labelled ‘‘ D. plicata, 95-9-18.,”’ 
Fic. 2... Animal, viewed from-the right side. x 2°65. 
,, 2a. Animal, viewed from the lett side. x 2°65. 
Sor ee Ds Dia em oc les 
5»  2e. Median and adjacent teeth of the radula. x 550. 
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