5° 



NOTE ON THE ANATOMY OF AMPHIDROMUS 

 PALAGEUS, MOUSS. 



By WALTER E. COLLINGE. 

 (Plate iv.) 



During the past few years considerable attention has been given to 

 the anatomy and classification of the different species of Ampliidromus. 

 AViegmann -"^ has described in great detail the structure o{ A. adamsi, 

 Rve., A. iiorcellanus, Mouss., and A. contrarms, Miill., and later ^ 

 that of A. }wrcella?ius, Mouss., and A. siidst rails, Rve. Jacobi ■'' has 

 given a valuable account of two Malayan species — A. chlons, Rve., 

 and A. interniptu^, Miill., while Pilsbry* has recently written on the 

 sub-genus Beddomea, Nev., shewing its affinities to Amphidromus. 



Some short time ago I received from Mr. H. Rolle of Berlin, two 

 examples of A. j^alaceics, Mouss., from Java, of which I am now able 

 to give a short account of the internal structure. 



Fulton^ and Pilsbry'' both assign this species to the "Group of 

 A. java7iiciis," none of the species of which, have as yet been 

 anatomically described. 



A. j^cilccceus differs from all the above mentioned species in many 

 characters, but particularly in the form and structure of the generative 

 organs and free muscles. 



The Generative Organs. — (PI. iv, figs. 3 — 5). — The vestibule is 

 small, beyond it is the vagina, a long, wide tube, the internal walls of 

 which are thrown into a series of longitudinal plications, with short, 

 fine transverse folds connecting them (PI. iv, fig. 5). At the point 

 where the receptacular duct and free-oviduct enter the vagina, 

 it dilates to form a wide sac. The penis is a somewhat short, 

 bulbous sac, and distally gives place to a long, densely coiled 

 tube, the epiphallus, which penetrates the distal wall of the 

 penis and terminates in a bluntly ending, fleshy papilla (PI. iv, fig. 4, 



1. Zool. Ergebnisse einer Reise in Niederland. Ost. Indien, 1893, Bd. ii, pp. 191 — 210, 1. xiv — xv. 



2. Abhandl. d. Senckenb. naturf. Gesell., 1898, pp. 289 — 557, T. xxi — xxxi. 



3. Archiv fur Naturgesch. Berlin, 1895, pp. 293 — 318, T. xiv. 



4. Proc. Malac. Soc. Lond., igoi, vol. iv, pp. 158—162, pi. xvi. 



5. Ann. Mag. N. H., 1894 (ser. 6), vol. xvii, pp. 66 — 69, pis. v — vii. 



6. Iilan. Conch., ser. ii, 1900, vol. xiii, p. 134. 



