18/1.] MR. G. F. ANGAS ON NEW AUSTRALIAN SHELLS. 17 



16. Rissoina crassa, n. sp. (Plate I. fig. 10.) 



Shell pyramidally ovate, thick, whitish, strongly distantly longi- 

 tudinally plicate ; whorls 7 to 8, slightly rounded, suture impressed, 

 the last whorl with a rounded ridge at the base, over which the longi- 

 tudinal plications are continued ; aperture subovate, strongly and 

 obliquely sinuate in front ; outer lip sharp, thickly variced behind ; 

 inner lip thickened, sinuous. 



Length 3£ lines, breadth 1 line. 



Hab. From the "Bottle and Glass" rocks, under stones, Port 

 Jackson {Brazier). 



17. Clathurella hayesiana, n. sp. (Plate I. fig. 17.) 



Shell ovately fusiform, rather solid, of a dull chalky-grey colour ; 

 whorls 7, angulated at the upper part, closely longitudinally ribbed 

 and transversely ridged, forming flattened nodules at the points of 

 intersection ; spire sharp, apex purple ; aperture elongately ovate, 

 deep purple within ; outer lip finely denticulated at the edge, con- 

 tracted below ; posterior sinus narrow and rather deep. 



Length 6 lines, breadth 1\ lines. 



Hab. Dredged in Lane Cove, Port Jackson, NewS.Wales(-Bra^'er). 



This elegant species differs from C. retieosa, A. Ad. & Angas, in 

 having the whorls angulate at the upper part, with the latticed 

 sculpture less nodulous at the crossings ; it also wants the band, the 

 channel is more contracted and produced, and the nodose lirse are 

 absent within the outer lip. 



18. Clathurella tenuilirata, n. sp. (Plate 1. fig. 18.) 



Shell fusiformly turreted, solid, opaque, pale brown ; whorls 8, 

 convex, longitudinally ribbed with about eight somewhat compressed 

 prominent ribs, crossed with distant narrow erect ridges that become 

 sharply angular at the intersection, the entire spaces between them 

 being very closely and regularly ornamented with fine hair-like con- 

 centric strise ; spire sharp ; aperture narrowly ovate ; outer lip thiu 

 at the edge, variced behind, the interior with a tubercle next the pos- 

 terior sinus, which is broad and shallow. 



Length 4 lines, breadth 1| line. 



Hab. Goat Island, Port Jackson ; dredged in 5 fathoms {Brazier). 



19. Clathurella sculptilis, n. sp. (Plate I. fig. 19.) 



Shell fusiformly turreted, moderately solid, pale brown ; whorls 7, 

 rounded, a little excavated next the sutures, longitudinally rather 

 strongly costate, with about nine rounded ribs, between which are 

 numerous fine erect longitudinal strise, which become crescent- shaped 

 on the flattened area below the sutures, and encircled with numerous 

 concentric, somewhat irregular ridges, which are slightly nodulous 

 at the intersections ; aperture subpyriform ; outer lip thin, sharp, 

 variced externally, slightly sulcate within ; columella straight ; canal 

 slightly produced and everted ; posterior sinus rather deep. 



Length 4 lines, breadth If line. 



Hab. Dredged near the " Sow and Pigs," Port Jackson (Brazier). 

 Proc. Zool. Soc— 1871, No. II. 



