372 PLEUROTOMID^:. 



Bay, co. Galway (Walpole) ; Cork (Humphreys) ; co. 

 Antrim, in 60 f. off Loch Ewe, and in 43 f. on the 

 Shetland coast (J. G. J.). The variety is from Fal- 

 mouth (Cocks and Barlee); Shetland, 78-86 f. (Barlee 

 and J. G. J.). D. reticulata belongs to our Red and 

 Coralline Crag (S. Wood, as Clavatula cancellata}, and 

 to the Italian tertiaries (Philippi and Calcara). It is 

 spread along the north- Atlantic coasts, from Brittany 

 (Collard des Cherres and Tasle) to Gibraltar (M f An- 

 drew), and throughout the Mediterranean, Adriatic, 

 and ^Egean, at depths of from 4 to 35 f. The variety 

 has been dredged by Lilljeborg in Norway, by Loven 

 and Malm in Bohuslan (by the latter in 40 f.), and by 

 Forbes in the ^Egean (as var. spinosa) in 105 f. 



This species varies remarkably in size. An Irish 

 adult specimen is only three lines long; another, from 

 Shetland (the varietal form), measures nearly an inch 

 and a quarter. Those from the Mediterranean are of 

 two kinds, one like ours, and the other (which is more 

 usual) having a shorter spire and very tumid whorls, 

 and averaging three-quarters of an inch in length. The 

 latter may therefore be considered the typical form. 

 The variety is extremely beautiful, and almost " para- 

 gons description;" it will be figured in the next 

 volume. 



It is the Murex cancellatus of J. Sowerby (not Pleu- 

 rotoma cancellata of Calcara, nor Fusus cancellatus of 

 Mighels and Adams, both of which appear to be also 

 species of Defrancia) , M. echinatus of Brocchi, Pleuro- 

 toma Cordieri of Payraudeau, P. rude of Scacchi, and 

 P. purpureum of Philippi not M. purpureus of Mon- 

 tagu; I described the present species as P. scabrum, 

 under the impression that it was distinct from the 

 Mediterranean shell and not merely a variety. 



