162 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



rounded, higher than broad (slightly angiilated in the young), not 

 descending, closely ribbed, about 8 ribs per millimetre, sloping slightly 

 backward on the upper surface, a little undulating at the peiiphery, 

 straight on the base, interstices between the ribs ornamented with 

 fine hair-lines, reticulated with fine striae. Spire convex, embryonic 

 shell smooth and shining ; sutures impressed. Aperture oblique, 

 rotundly lunate, columella descending, gradually arcuated, slightly 

 thickened, and rather broadly dilated above, white ; peristome simple, 

 straight, margins slightly approaching. Umbilicus deep, about 1 mm. 

 in diameter, usually whitish within the crater ; base rounded. Diam. 

 maj. 6"8, min. 5'5 mm. ; height 4'5mm. 



Type in my collection. 



liah. — Wanganui, Cape Egmont, North Island (R. M.). 



This shell has been confounded with Phacussa hypopolia, Pfr., a species 

 which varies considerably. Mr . W. Moss has had examples compared with 

 the type of P. hypopolia in the British Museum, and found they were not 

 that species, from which it may be distinguished by the more rounded 

 base, more dilated columella, and very diiferent coloration. Recently 

 I received from Mr. H. 8uter examples of P. hypopolia fi-om Pelorus 

 Valley, South Island, a local variety, which in contour and coloration 

 very closely resemble F. perplexa : the latter differs in the umbilicus 

 being a little wider, the base somewhat more rounded, the body-whorl 

 being proportionately a little greater in height to its breadth than in 

 this variety, the aperture a little less oblique, and the shell half a 

 whorl less. No well-marked characters separate the two forms. 



4. Flammulina (Allodiscus) Mossi, n.sp. 



Shell small, subdiscoidal, narrowly umbilicated, yellowish horny, 

 didl, thin and semi-transparent, spotted and somewhat reticulated with 

 rufous markings, usually a number of larger splashes near the sutures, 

 extending to the peripheiy on the body-whorl, base with a few lighter- 



Flammulina Mossi, n.sp. 



coloured spots and streaks. Whorls 5-5^, rather convex, regularly 

 increasing, the last not descending, rounded, closely ribbed, about 10 ribs 

 per millimetre, sloping slightly backward on the upper surface, straight 

 on the base ; interstices between the ribs with fine growth-lines, 

 reticulated with fine striae. Spire convex, embryonic shell smooth and 

 shining, sutures well impressed. Apertiu'e very oblique, lunate ; 

 columella shortly descending, arcuate, 'a little thickened and reflected 

 above ; peristome thin, straight, margins slightly approaching. 



