CARDIUM. 273 



3. C. TUBERCULA'TUM *, Linne. 



C. tuberculatum, Linn. Syst. Nat. p. 1124. C. rusticiim, F. & H. ii. p. 1 1, 

 pi. xxxi. f. 3, 4. 



BODY reddish-yellow : mantle thickened and notched on the 

 posterior side : tubes fringed with cirri : foot long and of a 

 crimson colour. 



SHELL resembling that of C. echinatum ; but it is larger, and 

 much more globular and solid ; the sculpture is coarser, and 

 there are 21 or 22 ribs ; the spines are more like tubercles, 

 those on the anterior side being spatulate, or flat and trans- 

 versely triangular, while those in front and on the posterior 

 side are very short and bluntly conical : colour yellowish-brown 

 with a tinge of red, often disposed in beautifully variegated 

 zones or bands : margins in front remarkably contracted or 

 pinched in, so as greatly to increase the convexity of the shell. 

 It does not differ in other particulars from C. echinatum. 

 L. 2-9. B. 3-2. 



HABITAT : Cornwall, Devon, and Dorset, in sandy 

 bays, from low water at spring tides to 12 fathoms; 

 Guernsey (Lukis) ; Bantry Bay (Humphreys) . Leach 

 says, "abundantly in the Firths of Forth and Clyde, 

 Yawl [Youghal], Bantry, Cork, and Dingle Bays, Ire- 

 land ;" but I fear he has confounded this species with 

 C. echinatum. Newer pliocene, Worcestershire ( J. Smith) ; 

 Sussex tertiaries (Godwin- Austen). It has not been 

 recorded from any place north of Great Britain ; but 

 its range southward extends from Finistere to Vigo, 

 Madeira, and the Canary Isles, as well as throughout 

 the Mediterranean as far as Sicily. 



Young shells are very pretty. They are invariably 

 coloured like the adult, the ribs are covered with white 

 calyciform tubercles, and the transverse markings form 

 near the beaks a fine and regular lattice-work. A single 

 valve in Dr. Turton's collection is obliquely elongated at 



* Covered with tubercles. 



N5 



