58 LAND AND FEESHWATER 



fortsetzt. Der Liebesfeil ist am Ende in schrageii Schlitz geofFnet. 

 Der Penis ist gerade gestreckt, sein Lumen entspricht in der Form 

 seinem iiusseren Umfange. Receptaculum gestielt." 



Microparmarion. — " Die Mantelkaute verwicht sich. Die diinne 

 von gliinzender Epidermis iiberzogene Schalenplatte hat (z. T.) an 

 der unterseite noch einen Rest von Gewinde, Der Liebesfeil hat 

 eine solide Kalkspitze. Der Penis ist eiu diinner, in der geraden 

 Scheide mehrfach zusammengekriimmter Schlauch, so dass das 

 innere Lumen dera ausseren Umfange durchaus unahnlich ist. Re- 

 ceptaculum sitzend." 



I iUustrate the anatomy of Microparmarion with my original 

 drawings (those in the P. Z. 8. 1895 being copies of them) of two 

 species from Borneo, M. pollonerai and M. simrothi, Coll. & G.-A., 

 the latter being the nearest to M, stnihcUi, Simroth ; the differences 

 are quite specific. 



No slug-like form from India and Burmah, as yet examined by 

 me, possesses a calcareous spicida amoris or an amatorial organ 

 like those figured by Simroth in his paper, and by myself on 

 Plates LXXIV. tfe LXXV. The short sessile receptaculum seminis 

 is also peculiar to the Malayan area, for even when somewhat 

 lengthened as in Parmarion, it is usually a short sac as compared 

 with the elongate large form met with in Girasia and Austenia 

 (see plates xxv. & xxvi. P. Z. S. 1880 ; and Vol. I. Part 6, PI. LXII. 

 fig. 3 6 of this work) — genera which appear to be the direct descen- 

 dants of Maerochlmnys. The spermatheca has, of course, a direct 

 relationship to the form and length of the spermatophore. This 

 organ has yet to be found in the Javan and Bornean species, and it 

 will be interesting to see, when it is, what form it may present ; it 

 will doubtless be of further generic value. It may be of interest here 

 to quote from the paper by Mr. Collinge and myself what a better 

 knowledge of the internal anatomy indicated : — " . . . the most 

 interesting result of the examination of these slug-like molluscs is 

 their similitude internally to the similar parts of shell-bearing 

 species which inhabit the same island of Borneo. A reference to 

 the figures and description of the genera Everettia and Byakia 

 [vide paper by me in P. Z. S. 1891, ' On a Collection of Land- 

 Shells made in Borneo by Mr. Everett '] will show that the calca- 

 reous dart peculiar to Microparmaynon occurs in both of these 

 genera, while the odontophore of Damayantia smithi agrees with 

 that of Dyalia in a remarkable manner." My attention was first 

 directed to this point of local resemblance when describing the 

 Bornean subgenus " £Ver^/^M/," P. Z. 8. 1891. So far as my ob- 

 servation goes, it seems very probable that MacrocMamys does not 

 extend to Borneo, and I expect the limit of its range may go no 

 further east than Java *. In Borneo Everettia takes its place — a 

 shell with a very different lineage ; this is what I wrote at the 

 time under Everettia jucunda: — 



" This shell was placed by Von Martens in the genus Alacro- 

 chlamys, and looking at its shiny glossy shell, so very like many in 

 * I have Been a species extremely like 3/. rc'ptcndens from that island. 



