13 



DESCRIPTIONS OF TWO NEW SPECIES OF MELANIA FROM THE 

 NEW HEBRIDES. 



By E. R. Sykes, B.A., F.L.S. 



Read Uth November, 1903. 



The two species now described were sent recently by Mr. H. S. 

 Mort, with a note stating that he and other workers had been unable 

 to identify them, and inviting me to describe them if they proved to 

 be new. Having been unable to trace them, either in the British 

 Museum collection, in Dr. Bi'ot's excellent monograph, or in other 

 works, I now venture to offer diagnoses. The habitat is Espiritu 

 Santo, New Hebrides. 



Mfxania Morti, n.sp. Fig. 1. 



Shell elongate, subulate ; colour varying from a xery dark olive- 

 green to almost black, the earlier whorls being eroded and yellowish- 

 white. Sculpture : well-marked longitudinal ribs, varying considerably 

 in their relative distance apart, but usually about twentj' in number 

 on the last whorl, at the base of which several minute spiral lines 

 may be seen ; the earlier whorls appear to be smooth. Whorls 

 probably about ten in number, flattened, with a well-marked suture, 

 the longitudinal ribs usually fading out as they approach the suture. 

 Mouth pyriforra, olivaceous to black inside, thickened and lightly 

 reflexed at the columella, with a thin white callus joining the 

 margins. Alt. (spec, decoll.) 38 mm., diam. max. 6'5 mm. 



An interesting form, which I have much pleasure in naming after 

 Mr. Mort. Its most noteworthy features are the well-marked longi- 

 tudinal ribs, which stand out prominently on the later whorls. 



