131 



P. PELLUCIDA. Lin. 1260. D.p. 1042 Lam. 42. 

 r-List. t. 543. /. 27. Pen. 4. p. U3.Born. t. 18: 



/. 9. Ch. f. 1620. .F. p. 287. Elliptic, smooth, 

 polished, pellucid, olive, with interrupted sky-blue 

 radiating lines ; apex near the margin, often obsolete ; 

 margin entire. Var. (P. L^EVIS. F. p. 287. 1). p. 

 1043. Pen. 4. p. 144. t. 90. /. 151. List. t. 542. 

 /. 26. P. CffiRULEEA. Mont. Sup. p. 152.) coarser, 

 thicker, ochraceous with azure lines .0,80. The variety 

 is found on the roots, the type, on the leaves of Fuci ; 

 common. 



P. VIRGINEA. Mutter. Z. Dan. t. 12. /. 2,3. D.p. 

 1052. F.p. 287. Desk, in Lam. 7. p. 544.Gmel. 

 3711. p. PARVA. Mont. p. 480. Oval, obtusely 

 conical, small, pink, with numerous reddish radiating 

 lines, smooth, more or less pellucid (becoming by age 

 opaque and of an uniform colour) ; apex obtuse, not 

 central ; margin entire. 0,40... 0,30. On stones near 

 low water mark, not uncommon. 



P. TESTTJDINALIS. Mutter and Desk, in Lam. 

 P. CLYPEUS. Brown. El. P. CLEALANDI. Sow. Lin. 

 T. 13. p. 621. F. p. 287. Oval, white with red 

 brown or purple spots, faintly striated longitudinally 

 and still more faintly transversely ; summit obtuse, 



