BY C. HEDLEY. 445- 



small heterostrophe apex. Sculpture: fifteen stiong, elevated 

 sigmoid ribs cross the whorls perpendicularly and fade away on 

 the base; they are rather narrower than their deep interstices,, 

 and are interrupted, from whorl to whorl, by the sutural trench. 

 These radials over-ride two spiral threads, the upper of which 

 alone persists on the spire-whorls as a supersutural keel. Colu- 

 mellar plication prominent. Length 3-3; breadth TO mm. 



The double peripheral thread and jointed aspect of the spire 

 give this species an individuality. Several specimens were taken, 

 in 5-10 fathoms. 



Odostomia chorea, n.sp. 

 (Plate xli., fig.66.) 



Shell small, solid, subcylindrical, imperforate. Colour wliite 

 with a narrow gold band in the centre of each whorl, and another 

 on the body-whorl just below the level of the lip-insertion. 

 Whorls five and one-half, and an immersed heterostrophe proto- 

 conch. Sculpture : narrow, sharp perpendicular radial riblets,. 

 separated by rather broader interstices, extending from summit 

 to base; on the last whorl these amount to sixteen; no trace of 

 spiral sculpture. Aperture pyriform, rather oblique, rounded 

 anteriorly, outer lip simple, a solid calltis on the body-whorl, 

 plication slight, deep seated, columellar margin reflected. LeiK^th 

 2: breadth O'To mm. 



Several specimens, from 5-10 fathoms, off the Hope Islands; 

 also from 17-20 fathoms, off Mast Head Island, and beach at 

 Caloundra. The latter, which sometimes have an extra gold line 

 on the base, are mentioned as perhaps a variety of 0. opaca.*' 

 The latter is known only from Sydney. 



Odostomia compta Brazier. 

 Odostomia compta Brazier, These Proceedings, i. 1877, p. 25 9 : 

 id., Hedley, Rec. Austr. Mus , iv. 1901, p.l25, PI. xvi., f.16-19 : 

 0. eutropia Melvill, Ann. Mag. Xat. Hist. (7), iv. 1899, p. 9 4, 

 Pl.i., f.U. 



* Heciley, These 1 roceedings, xxx. p. 525; xxxii. p.4&'2. 



