380 pleurotomidjE. 



nuata ; but this is much smaller, thicker, less slender, not 

 attenuated towards either extremity, nor glossy ; the base is 

 considerably broader in proportion ; the ribs are stronger, 

 blunter, and more angulated, and there are only 7 (or at the 

 most 8) on the body-whorl; their interstices are somewhat 

 concave ; the spiral stria3 are closer and finer : colour less 

 regular, with the lines and bands broader, sometimes mottled, 

 or the upper part of the shell chocolate, and the lower yellowish ; 

 the outside of the mouth and the throat or inside of the outer 

 lip usually exhibit a purplish-brown blotch : spire less taper : 

 whorls not so convex, the last occupying three-fifths of the 

 shell : suture not so deep : mouth much narrower ; length two- 

 fifths of the shell : canal more curved, shorter, and broader : 

 outer lip continuous with the inner lip, considerably thickened 

 within, where it is frequently furnished with a narrow white 

 ledge ; edge not so thin or sharp : labial notch much deeper : 

 inner lip thickened, and reflected above : pillar flexuous. 

 L. 0-45. B. 0185. 



Habitat : Generally distributed ; living at low-water 

 mark of spring tides, in rock-pools, on the coasts of 

 Devon and Cornwall (Clark and Templer), in 95 f., on 

 fine sand, off Unst (J. G. J.), and in 145 f. off the Mull 

 of Galloway (Beecliey) . The (C P. coarctata " of Forbes 

 is merely the northern, and consequently larger, form 

 of this common species. Fossil in the glacial deposit 

 at Wexford (Sir H. James) ; Belfast (Grainger) ; Red 

 and Coralline Crag (Wood); Norway, 70-80 feet, retain- 

 ing its coloured band (Sars); Lillo near Antwerp (De 

 Wael) ; Antibes (Mace) . Finmark to Bohuslan, 10-70f. 

 (Sars, Loven, and others); Zealand (mus.Copenh.); Brit- 

 tany (De Gerville and others) ; Arcachon (Fischer) ; 

 Rochelle (D'Orbigny pere) ; Spain and Portugal, 7-12 f. 

 (M f Andrew) ; Provence (Gay); Spezzia (J. G. J.); and 

 probably every part of the Mediterranean and Adriatic, 

 as P. tceniata and under other less known names. 



The Murex costatus of Pennant is a mixture of small 

 shells belonging to different genera. Da Costa's Bucci- 



