SCALARIA. 91 



Bergen (Loven and others) to Madeira (M^Andrew) , and 

 every part of the Mediterranean^ Adriatic,, and ^gean, 

 at depths ranging between 5 and 45 f. 



Several specimens having the operculum were in Mr. 

 Clark^s collection^ from Exmouth : I wish he had given 

 us an account of the animal. Young shells have the 

 base somewhat angulated. 



It was possibly the Turbo ambiguus of Linne, described 

 as inhabiting the Mediterranean^ and very like T. cla- 

 thrus (but fleshcolom% with 3 reddish-brown bands, and 

 having twice as many ribs) ; this, however, is said to be 

 umbilicate, a character that belongs to none of the 

 European species. Risso appears to have given our shell 

 the specific names of Turtonia and (as fossil) elegans, 

 Michaud that of tenuicosta, Bivona planicosta, Scacchi 

 plicata, Broun alternicosia, and Leach Turtoniana, 



2. S. commu'nis*, Lamarck. 



8. communis, Lam. An. s. Vert. vi. (2) p. 228 ; F. & H. iii. p. 206, pi. Ixx. 

 f. 9, 10. 



Body milk-white, irregularly streaked with black or mottled 

 with dark-purple on the upper part : mantle thick, tight about 

 the neck, its margin forming a round collar: snout vertically 

 cloven in the centre, whence the proboscis (which is white) 

 frequently protrudes as if in search of food : tentacles long and 

 slender [black, Alder] : eyes on the iuner side of small bulbs 

 or excrescences [white spaces, Alder], which rise from the 

 outer bases of the tentacles : foot, when fully extended, long 

 and narrow, somewhat angulated and notched or bilobed in 

 front, with a very slight rounded auricle at each corner, and 

 tapering behind to a point ; it is often carried far beyond the 

 head ; sole marked in the middle from one end to the other 

 with a groove or impressed line. [Male organ long, bent, and 

 pointed, of a dusky hue (Clark).] 



Shell more conical than the last species, solid, opaque, and 

 of rather a dull hue : sculpture, shghtly curved longitudinal 



* Common. 



