66 SCHISMOPE. 



different, the mouth is larger, and the umbilicus is wider and yet 

 more shallow. ( Watson.} 



Port Jackson, Sydney, Australia, in 6-15 fms. ; Raine Island, Cape 

 York, North-Eastern Australia, in 155 fins. 



Schismope carinata WATSON, Challenger Hep., Gasterop., p. 119, 

 t. 8, f. 6, 1886. 



S. ATKINSONI Tenison-Woods. 



Shell minute, globose-depressed, brown ; spire short, low, blunt ; 

 whorls 3, rapidly widening, plane above, the last very deeply de- 

 scending toward the aperture, with a strong keel at the shoulder, oc- 

 cupied by the anal fasciole, and another keel at the periphery, the 

 space between them concave ; below this carina there are about 3 

 rather separated spiral lir3, and around the umbilicus three more ; 

 the keels are obsolete for a short distance behind the aperture ; 

 growth-striae fine, scarcely perceptible. Slit fasciole present on the 

 last 1 whorls, very narrow, its edges pinched up into a strong keel. 

 It terminates about ? or f of a mill, behind the peristome in a long, 

 narrow slot. Aperture very oblique, ovate, narrowed above ; colu- 

 mella slightly arcuate, nearly vertical ; umbilicus narrowly perfor- 

 ated, funnel-shaped, smooth inside. Alt. 2}, diain. 2? mill. 



Tasmania. 



Scissurella atkinsoni T.-WooDS, Proc. Hoy. Soc. Tasm. 1876, p. 149. 



Very like Scissurella declinans Watson in outline, except that the 

 superior whorls are not ribbed. On old shells the median carina 

 becomes rounded on the last f whorl, and there are numerous spiral 

 riblets both above and below the slit fasciole ; the lines of increment 

 are sometimes quite prominent in the interstices between the spirals. 



S. CROSSEI Folin. Vol. XI. PL 57, figs. 51. 



Shell minute, subturbinate, depressed, subcrystalline, slightly 

 shining ; spire short, very obtuse ; whorls 4, moderately convex, rib- 

 bed, joined by a slightly crenulated suture, the last whorl has a 

 double carina [slit fasciole] for two-thirds of its extent, and is or- 

 namented with narrow, very prominent longitudinal, slightly oblique 

 ribs, which attenuate or nearly disappear at the double carina [or 

 fasciole] which is marked by deeply sinuous riblets, and perforated 

 by an oblong-lanceolate foramen. Between the longitudinal ribs 

 there are subundulating spiral lirulse decussating them. Base deeply 



