308 PEOCEEDINGS OP THE MALACOLOGICAL SOCIETY. 



The external ridge or crest behind the outer lip recalls the similar 

 process observable in P. tortilahia, Less., from which, however, and 

 its allies, this pretty species is at once distinguished by the delicate 

 texture of the shell, the flat discoidal growth, and the plan of 

 coloration. In the last-mentioned particular it perhaps most nearly 

 resembles P. zebra, which, however, lacks the characteristic ' crista.^ 



2. Omphalotropis Heecitles, n.sp. Fig. II. 



Testa pro genere magna, elongate -pp'amidalis, anguste perforata, 

 obscure oblique striatula, brunnea, nitidula, lineis aut zonis cinereis 

 spiraliter notata, apice acutulo, rufo-brunneo, carina obscura filiformi 

 in medio anfractus ultimi et altera validiore cii'ca umbilicum munita ; 

 anfr. 8-8J, plano-convexi ; sutura aniractuum superiorum carina 

 marginata ; apertura piriformis, peristomate leviter incrassato, 

 subreflexo, brunneo, marginibus callo junctis, margine columellari 

 infra subito auriculatim dilatato ; operculum corneum, tenue, sub- 

 spirale. Long. 14-6, diam. max. 7*8 mm. 



B:ab.—M.t. Mada, Buru, at 3,000 feet. 



Yar. a. Crocea. 



Mab.— With type. 



Yar. ^. Minor. Long. 12, diam. max. 7 mm. 



Mab. — Bara, Buru. 



Closely related to 0. Ceramensis, Pfr. {= 0. licarinata, Martens), 

 which is found in Buru, Coram, and Amboina ; but the present species 

 is larger, more attenuate, has more flattened whorls, whilst the earlier 

 ones do not increase so rapidly in breadth. We cannot trace on our 

 specimens of 0. Ceramenms, even under a strong lens, the "lineis 

 spiralibus subtilissimis confertissimis " described by authors. 



