1867.] MR. G. F. ANGAS ON NEW AUSTRALIAN SHELLS. 1 1 I 



the ridges on the last whorl alternately larger and smaller, crossed 

 by very fine longitudinal lines ; spire elevated ; whorls eight, slightly 

 rounded ; aperture rather more than half the length of the shell, 

 narrow ; columella three-plaited, the upper plait the largest ; outer 

 hp thin. Length 7 lines, diam. 2^ lines. 



Dredged in Middle Harbour, Port Jackson (Coll. Angus). 



Several specimens of this pretty little Mitra were also obtained at 

 Moreton Bay by the late Frederick Strange, to whose memory I have 

 dedicated it. 



5. CoLUMBELLA (Mitrella) albomaculata, n. s. (PI. XIII. 

 fig. 5.) 



Shell elongately fusiform, rather solid, whitish, tinged with violet ; 

 lower portion of the whorls faintly reticulated with chestnut, with 

 broad brown flames, thickly spotted with white below the sutures ; 

 whorls eight, flattened, basal whorl spirally ridged anteriorly ; aper- 

 ture rather narrow, two-fifths the entire length of the shell ; colu- 

 mella arcuated, callous, transversely finely ridged in front ; outer lip 

 sinuated posteriorly, edge thin, thickened exteriorly, and dentated 

 within. Length o| lines, breadth 2 lines. 



Under stones at low water. Port Jackson {Coll. Angas). 



6. iEsopus filosus, n. s. (PI. XIII. fig. 6.) 



Shell elongately fusiform, pale fulvous or brown, with sjiots of 

 darker brown and white below the sutures ; spire acuminately tur- 

 reted, apex a little obtuse ; whorls eight, slightly convex, trans- 

 versely finely sulcated throughout, last whorl nearly one-third the 

 length of the shell ; aperture moderate, ovate ; columella arched ; 

 outer lip slightly thickened externally and denticulated within. 

 Length b\ lines, breadth 2 lines. 



Dredged in Port Jackson in 5 fathoms {Coll. Angas). 



7. Acus (Abretia) bicolor, n. s. (PI. XIII. fig. 7.) 



Shell subulate, whitish, the lower half of the last whorl chocolate- 

 brown ; whorls nine, nearly straight, more or less nodulous below 

 the sutures, thin, longitudinally ribbed, or very finely striated, the 

 ribs on the last whorl ceasing at the periphery ; columella arcuate ; 

 aperture small, ovately lunar ; outer lip thin, rounded. Length 

 8 lines, breadth 2 lines. 



Dredged in Middle Harbour, Port Jackson {Coll. Angas). 



8. Acus (Abretia) assimilis, n. s, (PL XIII. fig. 8.) 



Shell elongately fusiform, rather solid, light fulvous, stained at the 

 lower part of the whorls with purplish chocolate ; whorls nine ; a 

 little rounded, longitudinally ribbed ; ribs rather broad, arcuate, 

 ceasing at the periphery of the last Avhorl, the interstices here and 

 there irregularly longitudinally striated ; columella arcuate, slightly 

 twisted at the base ; aperture small, contracted towards the front ; 

 outer li[) thin, simple. Length 5^ lines, breadth 1| line. ' 



Dredged in Port Jackson {Coll. Angas). 



