32 GASTEROPODA. 



132. P. teniliS, Gray, Proc. Zool. Sue., 1S67, p. 735. Shell thin, 

 conical, depressed, smooth, spirally striated. Yellowish white, apex 

 purplish. Diameter of base, '75 inch. 



CSYPTA. 



Shell oblong, elongate. Apex sub-marginal, sub-spiral ; internal 

 lamina concave, covering about half the cavity ; lip trausvere, nearly 

 straight, or with a slight sub-central notch. 



Widely distributed. 



133. G. COStata, Deslmyes, Anim. sans vert., vii., p. 644 ; Crepi- 

 dula costata, Gray, Dieff. N.Z., ii., p. 242. Convex, with longitudinal 

 broad flexuous ribs. Whitish ; brownish purple between the ribs. 



* 134. C. aciileata, Lamark, l.c , vii., p. 642. Oval, brown, 

 surface with spiral lines of spines or small scales ; apex lateral, 

 posterior, sub-spiral. Length, 1 inch. 



New Zealand (Rev. Ii. Taylor). Australia. South America. 

 California. West Indies. Kurachee. South Africa. 



135. G. COntorta, Q"-oy, I.e., iii., p. 418. Ovato-elongate ; con- 

 vex, smooth, generally contorted to the right, apex terminal. White. 



136. C. (lanacUS) ungniformis, Lamark, I.e., vii., p. 642. 

 Shell much depressed, generally concave above, apex posterior, ovato- 

 elougate, thin, smooth, sub-pellucid ; internal lamina generally convex, 

 lip straight or deeply emargiuate. White. 



Common, adhering to shells. Australia. 



FAMILY PILEOPSID^;. 



Shell conical, cup-shaped ; apex sub-spiral, small ; posterior cavity 

 simple. 



HIPPONYX. 



Shell thick, obliquely conical, apex posterior ; base shelly, with 

 a horse-shoe-shaped impression. 



West Indies. Philippines. Australia. Pacific. 



137. H. COmilCOpise, La-mark, I.e., vii., p. 614. Obliquely 

 conical ; base ovate ; margin smooth ; white ; radiately striated, and 

 transversely irregularly wrinkled ; apex curved. Height, - 45 ; length, 

 '5 ; breadth, '45. 



New Zealand and Chatham Islands ; dead shells only. Fossil in 

 the south-east of France. 



ORDER SCUTIBRANCHTATA. 



Gills consisting of two series of Iamella3, forming one or two series 

 over the back of the neck, or under edge of the mantle round the foot. 

 Animal hermaphrodite. Shell spiral or conical, or composed of several 

 pieces. 



Sub-order Podophthalma. 

 Eyes peduuculated. 



