246 GASTROPODA. [Pectinibranchia. 



2. Cerithiopsis canaliculata, Suter, 1908. Plate 14, fig. 17. 



Cerithiopsis canaliculata, Suter, P. Mai. S., viii, 35, pi. 3, f. 42. 



Shell small, subulate, solid, with channelled suture. Sculpture 

 consisting of 3 spiral keels, equidistant, the uppermost weaker and 

 close to the suture, the last whorl with an additional keel arising from 

 the suture ; crossed by oblique straight axial riblets, about 20 on the 

 body-whorl, their interstices narrower than those between the cinguli ; 

 crossing-points raised into roundish gemmules. Colour light brown, 

 the uppermost cincture of a darker colour. Spire high, conic, much 

 higher than the aperture ; outlines straight. Protoconch of all speci- 

 mens broken off, 1 smooth and convex whorl only left. Whorls 

 about 7. regularly increasing, flatly convex ; base smooth and mode- 

 rately concave. Suture deep, canaliculated by the cinguli. Aperture 

 vertical, subquadrangular, produced below into a very short and open 

 canal. Outer lip denticulated on the outside by the spiral sculpture. 

 Columella subvertical, rounded, slightly sinuate, terminating in a blunt 

 point below. Operculum unknown. 



Diameter, 1-4-1-6 mm. ; height, 4-4-5 mm. 



Animal unknown. 



Type in my collection. 



Hob. Bounty Islands, in 50 fathoms (Captain Bollons). 



3. Cerithiopsis cessicus, Hedley, 1906. Plate 14, fig. 18. 



Cerithiopsis cessicus. Hedley, P.L.S. N.S.W.. 1906, 529. Bittium minimum, 

 T. -Woods, P.R.S. Tas., 1878, 123; 1879, 37: Hedley, P.L.S. N.S.W., 

 1901, 722, f. 20. Cerithiopsis minima. T.-Woods : Tate and May, P.L.S. 

 N.S.W., 1901, 385 : not of Brusina, 1864. C. cessicus. Hedley : Suter, 

 P. Mai. S., -vnii, 35. 



Shell small, narrowly conic, solid. Sculpture consisting of 3 equi- 

 distant cinguli. the uppermost close to the suture, crossed by nearly 

 straight axial riblets, the interstices about as broad as the riblets ; 

 the points of intersection raised into roundish gemmules ; there are 

 about 18 to 20 riblets on the last whorl ; suture margined above by 

 a very fine thread, which continues upon the body-whorl as a fourth 

 keel. Colour yellowish-white. Spire elevated conic, much higher than 

 the aperture ; outlines slightly convex. Protoconch papillate, of 1^ 

 whorls, the first smooth and shining, the remainder distantly plaited. 

 Whorls about 8, regularly increasing, somewhat convex ; base con- 

 cave and smooth. Suture impressed, margined, sometimes very in- 

 distinctly. Aperture vertical, ovate, angled above, produced below 

 into a very short and wide canal with a notched base. Outer lip 

 sharp, sinuated by the spiral sculpture. Columella slightly oblique, 

 rounded and sinuate, truncated below. Inner lip spreading as a very 

 thin callus over the parietal wall. Operculum unknown. 



Diameter, 2 mm. ; height, 5 mm. 



Animal unknown. 



Type, in the Tasmanian Museum, Hobart. 



Hob. Snares, in 50 fathoms (Captain Bollons). Tasmania and 

 Australia. 



