AUBICULID^!. 41 



total length, compressed laterally, rather swollen at base ; 

 aperture scarcely oblique, broadly semiovate; parietal plait 

 single, thin, rather transverse ; coluniellar plait stronger, denti- 

 form; peristome thin, straight; right margin sinuate, smooth 

 within. Length 6, breadth 4 mill. 



Auricula infrequens, C. B. Adams in Ann. Lye. N. York, v. 



p. 433. 542. 

 Melampus (Tralia) infrequens, H. and A. Adams in Proc. Z. S. 



1854, p. II. n. 18. 

 Pfr. Syn. Auric, n. 55 ; Mon. Auric, p. 55 fLeuconia ?). 

 Tralia infrequens, H. and A. Adams, Gen. rec. Moll. ii. p. 244. 

 Sab. Panama. 



61. Melampus Stutchbukyi. 



Shell subumbilicate, fusiformly ovate, rather solid, faintly 

 striated, encircled near the suture with bluntly elevated ridges, 

 opaque, blackish-brown, with three white bands ; spire convexly 

 conic, with the apex pointed, but sometimes slightly eroded ; 

 suture linear, lacerated on the lower whorls ; whorls seven, flat, 

 the last forming nearly three-fifths of the total length, marked 

 with obsolete spiral striae below its middle, slightly attenuated 

 at base ; aperture nearly perpendicular, semiovate ; parietal plait 

 single, compressed, white, entering, produced externally into a 

 rather acute keel surrounding an mfundibuliform umbilical 

 hole ; coluniellar plait compressed, scarcely ascending obliquely ; 

 peristome sharp ; right margin not toothed, sinuate above ; 

 columellar margin vaulted and reflexed, free, simulating an 

 umbilicus. Length 16, breadth 8 mill. 



Melampus (Ophicardelus) Stutchburyi, Pfr. in Proc. Zool. Soc. 

 1856. 



Hab. Port Curtis, Australia (Mr. Stutchbury). 



§ 10. Labrum not plaited ; body of the penultimate whorl icith 



two plaits. 



62. Melampus costatus. 



Shell imperforate, ovate, solid, sculptured with strong longi- 

 tudinal ribs, which are contracted near the suture into blunt 

 tubercles, slightly shining, reddish brown or yellow; spire 

 short, conoidal, rather pointed; whorls seven, flat, the last 

 forming two-thirds of the total length, slightly inflated above, 

 attenuated at base ; aperture perpendicular, oblong-semiovate, 

 modified by three almost equal plaits; parietal plaits two, 

 compressed, the coluniellar one high, dentiform ; peristome 



