1895.] NEW MOLLUSCS FEOM EOENEO. 249 



Indian forms bear to Macrochlamys and allied shell-bearing genera, 

 and any true attempt at classification must be based on these lines, 

 and would place a wide gulf between Girasia and Austenia on the 

 one side, and Parmarion and Microjpai'marion on the other. 

 Further, we think that future research will clearly show that many 

 of the slugs cannot rightly be placed in families by themselves, but 

 will find their true position before or after the genera they have 

 descended from or developed into. 



VI. BlBLIOGEAPHY. 



1. GoDWiN-AusTEK, H. H. — " On the Land-MoUuscan Genus 



Girasia of Gray." P. Z. S. 1880, pp. 289-299, pis. xxiv.- 

 xxvii. 



2. GoDwi>--AtrsTEN, H. H. — " On a Collection of Land-Shells 



made in Borneo by Mr. Everett, with Descriptions of sup- 

 posed new Species." P. Z. S. 1891, pp. 22-47, pis. ii.-vi. 



3. Humbert, A. — " Etudes sur quelques mollusques terrestres 



nouveaux ou pen connus.^' Memoires de la Soc. de Phys. de 

 Geneve, Bd. xvii. pp. 109-128. 



4. IssEL. — " Mollusca Borneensis." Annali d. Museo Civico 



Genova, vol. vi. 1874, pp. 366-478, tav. iv.-vii. 



5. Martens, von. — Preussische Expedition nach Ost-Asien : 



Landschneck., 1867. 



6. Semper, C. — Eeisen im Archipel der Philippinen, 1870. 



7. SiMROTH, Heinrich. — " Ueber einige Parmarion- Arten." Zoolo- 



gische Ergebnisse einer Eeise in Niederlandisch Ost-Indien, 

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



VII. DESCRIPTION OF THE FIGUEES. 



Plates XI.-XIV. 



Fig. 1. Bamayantia smithi, n. sp. View from right side. X 2-5. 



2. Bamayantia smithi, n. sp. View from left side. X 2'5. 



3. Bamayantia smithi, n. sp. View from above. X 2'b. 



4. Dorsal view of shell. X 2-5. 



5. Visceral mass, showing spiral fold, sp.f. x 2-5. 



6. Caudal mucous pore. X 8. 



7. Jaw. X 12. 



8. Portion of lingual ribbon. X 368. 



9. Generative organs, x 2*25. 



Lettei'ing. 



alh.gl. Albumen-gland. ov. Oviduct. 



am. Amatorial organ. p. Penis. 



d.s. Dart-sac. pr. Prostate. 



/. Flagellum. r.m. Retractor muscle. 



h.d. Hermaphrodite duct. r.s. Receptaculurn seminis. 



h.gl. Hermaphrodite gland. r.s.l. Eight shell-lobe. 



l.d.l. Left dorsal lobe. v. Vestibule. 



l.s.l. Left shell-lobe. v.d. Vas deferens. 



ov'. Free oviduct. vg. Vagina. 



Figs. 10 & 11. Upper portion of penis, from both sides. X 3. 

 Fig. 12. Dart-sac and dart in situ. X 8. 



13, Microparmarion pollonerai, n. sp. Dorsal view, x 2'4, 



