COLLINGE : ON DA.MAYAXTIA, COLLINGEA, AND ISSELEXTIA. 11 



2. CoLLiNGEA SmxHi, Cll^e. & Godw.-Aust. (= Damayantia Smtthi, 

 Cllge. & Godw.-Aust.). 



"When in 1900 I re-examined this species, I found that the specimen 

 which Lieut. -Col. Godwin-Austen had figured {3, pi. xi, figs. 1-5) 

 was not the one I had dissected. My dissection was of a species of 

 Isselentia (which I have since named glohosa), while the specimen 

 described and figured by Lieut. -Col. Godwin-Austen turns out on 

 re-examination to be a member of the genus CoUingea, Simr. With 

 Mr. Edgar A. Smith's kind permission, I made a careful examination 

 of the generative organs, and found the peculiar handle-like protrusion 

 of the penis, thus leaving no doubt whatever as to the generic position 

 of this mollusc. Personally, I must admit that had I at the time seen 

 Issel's figures of Damayantia (3), I should most certainly never have 

 dreamt of placing this slug in this latter genus, and I think my 

 co-author would have acted more wisely had he, even at this late date, 

 admitted so palpable an error. But apart from the internal structure, 

 the merest tyro in malacology would not hesitate to at once distinguish 

 any species of Damayantia from the mollusc under discussion, in 

 which tlie shell is exposed, and all the external features point to 

 a relationship with the genus Parmarion of Fischer. 



3. Isselentia, Cllge. 



Hespecting the remaining two specimens in the bottle containing 

 Colltngea Smithi^ they are members of the genus Isselentia^ and of 

 course, the figure given bj' me in the Transactions of the Koyal Society 

 of Edinburgh {1, pi. iii, tig. 50) agrees pretty closely with that I had 

 previously given in the I'roceedings of the Zoological Society (^, pi. xi, 

 fig. 9) of the same specimen, then regarding it as a Damayantia. The 

 "wonderful similarity" noted by Lieut.-Col. Godwin- Austen is thus 

 easily explained. 



As to the views that the wavy crinkled edge of the keel of the 

 dorsum (not the foot) and that the plications of the mantle-lobes are 

 due to the action of alcohol, or a post mortem state due to contraction, 

 "which in all probability would not be seen in the living animal, or 

 in one killed in water and then put into spirit," one can scarcely 

 believe that the author is serious. I have examined upwards of two 

 dozen specimens of /. plicata, Cllge., all of which I believe were 

 killed in water. They were in a beautiful state of preservation, and in 

 eveiy case exactly like the original figures [1, pi. i, tigs. 13-15). As 

 to the validity of the genus, 1 have already described and tigured it in 

 some detail, and if Lieut.-Col. Godwin- Austen is unable to distinguish 

 it from Damayantia^ Issel, on the one hand, and Collingea, Simr., on the 

 other, I fear no further figures or description can be of any use to him. 



There are two other points which I must deal with, but being of 

 a personal nature I am loth to touch upon them except in the very 

 briefest manner. 



When 1 had dissected the specimens described in the P.Z.S. {2), 

 I made drawings of them, and together with the specimens forwarded 

 them to my co-author ; they were ultimately returned to me, and 



