BY THE REV. J. E. TENISON-WOODS. 1073 



p. 377, pi. 47, i3gs, 11-12; Gray, Cat. Phan. p. 93 = 31 anosioma, 

 Pfr. Mon, Pneunion. Suppl. I. p. 85. 

 Labuan, Borneo. 



M. LEPEEi, Morelet = Cyclostoma leferi, Morelet, Jour. Conch. 

 IX. 1861, p. 176 =^Megalomastoma hferi, von Mart. Ostas. Zool. 

 II. p. 154; Pfr. Mon. Pneumon. Suppl. III. p, 138. 



Borneo. 



M. DORIAE, Issel, Moll. Born. 1874, pi. 67, pi. 6, figs. 18-19 • 

 Pfr. Mon. Pneumon. Suppl. III. p. 138. 

 Sarawak, Borneo. 



M. (CoPTOCHiLUs) SECTiLABRTTjr, Gould ; von MiJll. Jour, As. 

 Soc. Beng. LV. 1886, p. 314. 

 Perak ; Larut ; Penang. 



32. Hybocystis, Benson, 1859, Annals and Mag. Nat. Hist. 

 3rd ser. IV. p. 90. 



This remarkable and exceedingly interesting genus, which forms 

 one of the peculiar features of the terrestrial moUuscan fauna of 

 the Malay Peninsula, deserves the fullest details in this list. 

 Fortunately its history as a species has been well marked ovit by 

 M. P. Fischer in the "Journal de Conchy liologie"(XXV. 3rd series, 

 1885, p.- 180), an epitome of whose researches will now be given. 



The genus was proposed by Benson in 1859 for a Burmese 

 shell which had been hitherto described as a species of Megaloma- 

 stoma, and in its young stages as a species of Oiopoma. Some 

 years before Dr. Gould, the American naturalist, had described 

 the same shell, for which he had proposed the generic name of 

 PoUicaria ; but as the genus was insufficiently defined, and 

 included species of different genera, Benson's genus has been 

 preferred as complying with every condition of necessary exact- 

 ness. 



The shell is ovoid and pupiform, but deviating from its axis 

 in the last whoi'ls in the manner of certain species of Streptaxis. 

 The ante-penultimate whorl is much developed and flattened in 



