Scissurella.} GASTROPODA. 89 



distant elevated radiating riblets, crossing the fascicle, and decus- 

 sating the whole surface. Spire depressed, tabulated. Aperture ob- 

 lique. Columella concave, slightly callous. Anal slit on the outer 

 lip deep and narrow. 



Type in the British Museum. 



Hob. Found among ironsand from New Zealand (W. Mantell). 



I have not seen this species. 



Fossil in the Pliocene. 



2. Scissurella rosea, Hedley, 1904. Plate 6, fig. 11. 



Scissurella rosea, Hedley. Rec. A.M., v, 1904, 90, f. 17 in text. 



Shell auriform, thin, translucent, narrowly perforate, spire slightly 

 elevate. Sculpture : Above, close fine spiral threads ; below, sharp 

 distant spiral keels, both crossed by faint growth-lines. Colour white, 

 with apex rose. Protoconch delicately longitudinally ribbed. Whorls 



3, last spreading and flattened above, earlier rounded. Aperture 

 large, oblique, oval. Columella concave, broad, extending a median 

 lobe over the steep and narrow umbilicus. Slit deep, situated well 

 above the periphery, and leading to a fasciole, which is not crossed 

 by lamella?, but edged with low smooth keels, and tapers to the ter- 

 mination, half a whorl back. 



Diameter Maj., 1-35 mm. ; min., 0-7 mm. : height, 1-2 mm. 

 (Hedley.) 



Type in the Australian Museum, Sydney. 



Hob. Lyall Bay, near Wellington, type (A. Hamilton) ; Snares, 

 in 50 fathoms (Captain Bollons) ; Banks Peninsula (Iredale). Also 

 Tasmania. 



Genus 2. SCHISMOPE, Jeffreys, 1856. 



Schismope, Jeffreys, A.M.N.H., xvii, 1856, 321. Type: S. cingulata, Costa. 

 Woodwardia, Crosse and Fischer, J. de Conch., 1861, 160. Scissurella. 

 d'Orb. (in part): A. Adams, A.M.N.H., 1862,346. Anatomus, H. and 

 A. Adams, G.R.M , i, 439 (in part). Schismope, Fischer. Man. de Conch., 

 846 ; Man. Conch. (1), xii. 49, 60. 



Anal fissure closed, forming a foramen in the outer wall of aperture ; 

 slit fasciole shorter, not over li whorls in length. 



Schismope is a Scissurella in which the anal slit becomes closed in 

 the adult, and transformed into an oblong perforation like one of the 

 holes of a Haliotis. 



From Tertiary to Recent. 



KEY TO SPECIES. 

 a. Shell turbinate. 



b. With distinct spiral keels, radiating riblets fine or obsolete Atkinsoni. 

 bb. One strong keel, base with strong radiate folds . . . . Beddomei. 



aa. Shell depressed turbinate, nearly auriform, sculpture micro- 

 scopic . . . . . . . . . . . . brevis. 



