MOLLUSCA.-HBDLEY. 



113 



by sharp but shallow spiral grooves, these are evenly dis- 

 tributed, they amount to sixteen on the last whorl and to six 

 on the penultimate and antepenultimate in the example drawn. 

 In other instances the ribbing is closer. Aperture: The outer 

 lip is thickened to form a slight external varix but is not 

 dentate within. Columella with two strong plications, above 

 which a callus thick-spread on the body whorl projects a 

 broad, blunt tubercle into the aperture. Length 2'5, breadth 

 I '65 mm. 



R. australis, Hinds, also from South Australia, is larger 

 but proportionately narrower. R. delecta, Murdoch and 

 Suter, from New Zealand, is larger, proportionately broader 

 and more densely striated. 



Wab.- -Numerous specimens were dredged in 100 fathoms 

 forty miles south of Cape Wiles. 



RiNGICULA SEMISCULPTA, Sp. nov. 



(Plate XX., figs. 39, 40.) 



Shell rather large and thin for the genus, ovate-globose, 

 glossy, subtranslucent. Whorls rounded, five, including a 

 tilted subimmersed apex. Suture impressed, bordered by an 

 opaque line. Sculpture : Everywhere are fine microscopic 

 growth lines, and on the shoulder a few microscopic revolving 

 scratches, on the base half a dozen widely-spaced spiral 

 grooves. Outer lip thickened in a low varix, not dentate, 

 sinuate posteriorly, insertion rising a little above the line of 

 the suture. Inner lip spread on the body whorl in a thick 

 callus, but without any tubercle. Columella with two pro- 

 minent, deeply-entering folds, the anterior larger and pro- 

 jecting beyond the canal. Length 5, breadth 3*5 mm. 



Judging from literature, it is related to R. nitida, Verrill, 

 from which the spiral sculpture would distinguish it. 



Hab. — A few specimens from 100 fathoms forty miles south 

 of Cape Wiles, South Australia. I have also taken it in 80 

 fathoms off Narrabeen, New South Wales, and in 300 fathoms 

 off Sydney. 



C— SCAPHOPODA. 



Dentalium thetidis, Hedley. 



Dentalium thetidis, Hedley, Mem. Austr. Mus., iv., 1903, 

 p. 327, f. 61. 



This species is new to the province, not having yet been 

 recorded beyond the original habitat of New South Wales. 

 A few specimens occurred in 100 fathoms forty miles south 

 of Cape Wiles, South Australia. Whereas the type has but 



