402 On Land-Mollusks from Java. 



tliere is a slioit retractor muscle, and in this species there is 

 also a short broad muscle arising from the wall of the vesti- 

 bule and inserted into the wall of the proximal portion of the 

 dart-sac. Beneath the muscular sheath is a thicker muscular 

 coat, which encloses the solid distal portion. The dart is 

 situated in the proximal portion, which lies above the penis 

 and vagina. It is a small tine calcareous rod, slightly spatu- 

 late at its head, approaching somewhat the shape of that iti 

 M. Strnhelit, Simr., and about 2 millim. long (PI. VIII. 

 fig. 19). 



Affinities. 



1'his species is undoubtedly closely allied to M. Austeni, 

 Simr. It agrees with it in the peculiar nature of the integu- 

 ment of the body and in the general structure of the generative 

 organs. A comparison of figures 7 and 8 with figures 16 and 

 3 7 will illustrate this relationship. 



M. Austeni, however, differs from M. Javanica in the 

 following particulars : — 



«. The external form and internal structure of the penis 

 (c/ figs. 9 and 18j. 



I. In M. Austeni the free oviduct shows a sac-like dilata- 

 tion opposite to and below the rcceptaculum seminis. 



c. The dart-sac is not so long as in M. javanica, and there 



are slight differences in the form of the darts, 



d. The prostatic portion of the common duct is in M. Austeni 



terminally free and globose. 



BiJdiograpJiy. 



(1) Pi,AiE, LuDAviG H. — " Studien iib(>r opisthopnonmone Liingen- 



schiiecken. — I. Die Anatoniie der Gattuugeu Daudebardia und 

 Tesfacellar Zool. .Tnhib. (Abtli. f. Morph.) 18! 1, Bd. iv. 

 pp. 605-630, Taf. xxxii.-xxxvii. 



(2) SEwrEH, C. — Reisen im Archipel der Philippinen, Bd. ii. H. 3. 



Landuiollusken. 

 (8) SiMBOTH, IIkinkich. — " Uebep einige Parmanon-P^sien." Zoolo- 



gische Ergebnisse einer Eeiso in Niederlaudisch Oist-Indien, 



1893, Bd. iii. pp. 100-111, tab. vii.-viii. 

 (4) SiMROTH, IIkinrich. — " Ueber die Gattuugen rannacocMea, 



Parmarion^ und Mieropannariott.'^ Zool. Jabrb. (^Abth. 1. 



!Sy.st.) 1898, Bd. xi. pp. 151 172, Taf. xv. 



EXPLANATION OF THE PLATES. 



Plate YTI. 



/V//.S. 1, 2. Parmarion jtupil/an's, Iliimb. (ieiieralive organs, .«h(j\viiig 



variations in^tlie fonii of the receptaciiluiu seminis, penis. Sic. 

 Fit/, o. ]iJicro/>ann(iriv)i Auftcni, Himr. X'iew fii mi the right .side, X 2. 

 ]■)(/. i. Ditto. View from the left side, X 2. 



