426 BASILISSA. 



pearly luster. It has some resemblance to Eutrochus gemynatuSf. 

 Reeve, in form and in its gemmed umbilicus; and though much 

 higher and more conical, recalls the Solaria of the group Torinia 

 (Gray), especially Solarium trochoides Desh. ( Wats.) 



E. of Cape York, Australia, 1400 fras.. 

 B. superba Watson, Jour. Linn. Soc. Lond., xiv, p. 598 ; Chal- 

 lenger Report, Gasterop., p. 101, t. 7, f. 10. 



B. oxYTROPis AVatson. PI. 36, figs. 8, 9. 



Shell small, high, conical, scalar, with a sharp, expressed carina at 

 the periphery and a second carina above, angulating the whorls. 

 Sculpture : there a-re a few close-set slight spirals on the edge of the 

 flat base ; there are many not close-set, flexuous, longitudinal ribs 

 above the periphery, but on the base merely lines of growth. These 

 ribs in crossing the upper carina form small sharp-pointed tubercles,, 

 of which there is also a trace on the lower carina. The superior sinus 

 lies just above the upper carina, the basal sinus toward the middle of 

 the base ; both are well marked. The apex is small and flat, the 

 smooth embryonic 1\ whorl hardly rising at all. The whorls are of 

 slow increase. The pillar is perpendicular, with a strong rounded 

 sinus, which corresponds to a swelling within the umbilicus. The 

 umbilicus is not large, but deep, funnel-shaped, with a puckered 

 •sharp edge. In both specimens there are 5? whorls to a height of 

 '05 and a breadth of "OS-S inch. 



This species, which is not full grown, slightly resembles B. alta and 

 var. oxytoma Wats., but is more depressed ; the carina is sharper and 

 is double, and the longitudinal ribs are very much stronger. Than 

 B. costalata Wats., this species is smaller, highei, mure conical, and 

 it is scalar ; the whorls are more carinated above, and the peripheral 

 carina is much more projecting ; the apex is minuter and sharper, 

 though the embryonic whorl is less raised, the base is smooth but for 

 the marginal spirals; the umbilicus is smaller. Compared to B. 

 reticulata (Solarium), Phil., it has a less expressed carina, and the 

 whorls are not angulated in the middle. ( Watson.) 



B. oxytropis Wats,, Journ. Linn. Soc. Lond. xiv, p. 693 ; Chal- 

 lenger Report, Gasterop., p. 104, t. 7, f. 9. 



Section Ancistobasis Dall, 1889. 



B. costulata Watson. PI. 36, fig. 3. 



Shell small, depressedly conoidal, sharply angulated, flattish on 

 the base, sharply and deeply umbilicated, a little porcelaneous, 



