354 



THETIS SCIENTIFIC RESULTS. 



Rissoa (AmpJiithalamns) jacksoni, Brazier, Proc. Linn. Soc. N.S. 

 Wales, (2), ix., 1895, p. 695. 



Station 49. 

 One specimen from 63-75 fathoms off Port Kembla. 



SCROBS SCROBICULATUS, Watson, up. 



Rissoa (Scrobs) scrobiculata, Watson, ChalL Rep., ZooL, xv., 

 1886, p. 611, pi. xlvi., f.4. 



Station 49. 

 One specimen from 63-75 fathoms off Port Kembla. 



SCROBS PYRAMIDATUS, sp. nov. 



(Fig. 77.) 



Stations 13, 35„ 37, 49, 57. 



Shell small, ovate, very solid, smooth and glossy. Colour 

 variable, either entirely clear hazel-brown or passing through dull 

 white, and cinereous to heliotrope ; the 

 coloured shells usually ivory white on 

 the base and aperture. Sculpture: faint 

 spiral scratches crossed by equally faint 

 growth lines. Whorls four, rounded, 

 last slightly gibbous; first one and a half 

 C? protoconch) spirally grooved, ending in 

 an obscure varix. Suture distinctly 

 impressed. Periphery angled more or 

 less sharpl}'. Base inflated. Aperture 

 ovate, entire, free, simple. The dis- 

 tortion of the last whorl has crumpled a 

 furrow between the aperture and the 

 last whorl, which on the axial region 

 enlarges as a false umbilicus. Height, 

 2*1 mm. : breadth, 1-4 mm. 



Fig. 



This seems a common form, and one characteristic of the con- 

 tinental shelf. It occurred alive in abundance at several of the 

 following stations: 54-59 fathoms off Wata Mooli (type), 50-52 

 fathoms off Botany, 43-75 fathoms off Port Kembla, 41-50 fathoms 

 off Cape Three Points, and 22-38 fathoms off Port Hacking. 



