10 PKOCEEDINfiS OF ■JIIK MAI.ACOI.OGICAL SOCIETY. 



examined numerous specimens of Girasia, Austenia, Parmarion, 

 Microparmarion, Damayantia, and allied genera from India, Ceylon, 

 Borneo, Lombok, Annam, Tonkin, China, the Philippines, etc. 



In this second examination I soon discovered that a serious error 

 had been made, for of the three specimens in the bottle labelled 

 Damayantia Smithi, I found that the one which Lieut.-Col. Godwin- 

 Austen had figured was different from the one I had dissected. It 

 was at once evident that the former was not referable to Issel's genus 

 Damayantia, for in this second Bornean collection I had numerous 

 beautiful examples of D. dilecta, Issel, the type of the genus, and 

 of a new species, D. caritiata, Cllge. Further, on examining the 

 anatomy of the specimen figured by Lieut.-Col. Godwin- Austen, 

 I found the handle-like protrusion of the penis, and therefore I 

 transferred this species to the genus CoUingea, Simr. The remaining 

 two specimens proved to belong to a new genus I was investigating 

 {Isselentia), and these I described under the name of 1. glohosa. 



This error I pointed out in the paper in which the second Bornean 

 collection was described {1). 



In August, 1902, Lieut.-Col. Godwin- Austen wrote me at consider- 

 able length, informing me that he was intending to publish his views 

 upon these molluscs, which correspondence continued until the end of 

 September. This correspondence is of interest, in that it throws 

 much light upon the views he then held upon the affinities, etc., of 

 the Indo-Malayan slugs and slug-like molluscs, but which have since 

 undergone still further change. 



Turning now to the criticism, it will perhaps be best if I treat of 

 the species and genera in the same order as Lieut -Col. Godwin- Austen. 



1. Damayantia caeinata, Cllge. 



Lieut.-Col. Godwin-Austen has seen a specimen of this mollusc, and 

 admits that it is " the first Bornean slug-like mollusc .... in 

 which the external form and proportion of the parts to one another 

 correspond closely with Issel's figure of Damayantia dilecta,''^ but he is 

 wrong in stating that I observed a "jagged or toothed appearance of 

 the keeled foot." The foot is not keeled, and what i described 

 was a jagged or toothed appearance on the keel of the dorsum. 

 As this is constant in all the specimens, and the most careful 

 examination fails to show that it is other than normal, I do not share 

 Lieut.-Col. Godwin - Austen's view that it is due to " epidennal 

 destruction." The shell is rightly described as being internal, yet 

 so recently as September 10th, 1902, Lieut.-Col. Godwin ■ Austen 

 emphatically denied this, stating that it only appeared so owing to 

 the expansion [!] of the shell-lobes. This is extremely interesting, as 

 showing his conception of the genus at that date. 



It is a matter of little moment whether or not this species is distinct 

 from D. dilecta, Issel. I have examined about thirty specimens of 

 this last-mentioned species from Borneo, and I am of opinion that 

 D. carinata is specifically distinct from it; on the other hand, 

 Lieut.-Col. Godwin- Austen, who has never seen a member of this 

 genus until he examined this specimen of D, carinata, thinks it is not. 



