290 PYKA^^lIDELLTDJE. 



at the suture. The obliquely set uucleus is peculiarly 

 sunken into the blunt apex. The botly, whose basal declin- 

 ation is gradual and convex, is broadly rounded at its peri- 

 phery. The shape of the mouth, which occupies three- 

 sevenths of the entire length, is nearly elliptical ; it is con- 

 tracted at both extremities, being rotundately so below, 

 where it is disposed to become effuse, and acutely so above 

 by the convex base of the preceding turn. The outer lip 

 is thin, devoid of internal sculpture, much arcuated at the 

 base, and merely convex posteriorly. Its edge, in our best 

 preserved specimen (which contains the animal), exhibits a 

 slight sinus at its junction with the body, and then swells 

 out without any proportionate retrocession at the base. 

 The pillar-lip is long (filling rather more than half the 

 length of the inner lip), straightish, and narrow ; in curling- 

 back it exposes an umbilical crevice which scarcely amounts 

 to an axial perforation. A rather small and retired plici- 

 form twist lies almost in the middle of the left lip. Three- 

 fourths of a line is the basal diameter of an example that 

 measures nearly the sixth of an inch in length. 

 The animal has not been examined. 

 The species is very rarely obtained, and much more 

 frequently dead in shell-sand, than in a living state. 

 Torbay, Burrow Island, and elsewhere in S. Devon ; 

 Tynemouth and Cullercoats ; Tenby and Linny Bay in 

 Pembrokeshire ; Langland Bay near Swansea ; Aberdeen- 

 shire ; Ullapool, Ross-shire ; Oban ; Loch Fyne ; in forty 

 fathoms, five miles east of Lerwick, Zetland ; Dunvegan, 

 Skye, Hebrides. (Jeff. Ann. Nat.). 



