of Brituh Mollusca. 147 



p. 310), but a form which has the ribs much leas strongly 

 developed than more southern specimens. 

 Var. tetragona, J. Sow. 



Purpura tetragona, Searles Wood, Crag Moll 1848, p. 38, 

 pi. iv. fig. 7 a-d. 



In the 'Annals/ 1883, a controversy will be found between 

 Jeffreys and Searles Wood, the former maintaining that this 

 shell was a Purpura, the latter that it was a variety of 

 Ocimhra erinacea. Searles Wood kindly sent me some of 

 his specimens of this form from Felixstowe, and it appears 

 to me that he was beyond question right in transferring 

 them to this genus. 



Var. melanostoma, Jeffreys, B. C. iv. p. 218. 

 Black-mouthed, Jersey [Dodd) . 



What Jeffreys calls var. sculpta, B. C. iv. p. 308, I judge, 

 from the description, to be what 1 consider the type of the 

 species. A remarkable variety which is found further south, 

 but has not yet occurred on our coasts, is the liurex torosus, 

 Lamarck. 

 2. Ocinehra aciculata (Lamarck), ^Mwrea? aciculatus, Jeffr. 



In the Channel Islands specimens attain much larger 

 dimensions than any I have seen from the Mediterranean 

 or Madeira. 



A genus has been made for this shell, Ocinebrina, Jous- 

 seaume, 1880,= Corallinia, Bucquoy and Dautzenberg, 1882 ; 

 but it is at most a section of Ocinehra. 



Genus 2. Trophon, Montfort. 



1. Trophon muricatus (Mont.). 



Var. lactea^ Jeffr. 



This variety was dredged by Jeffreys and myself 

 in Hurds Deep, near Guernsey, in 60 fath. I have 

 not seen it from any other locality. 



2. Trophon barvicensis, Johnston. 



I have collected this in many localities on the west coast of 

 Norway ; but all the specimens thence are much inferior in 

 size to those from our own seas. Its range has been extended 

 southwards to the coast of Marocco by the ' Travailleur ' 

 {Locard). 



3. Trophon truncatus (Strom). 



Var. scalaris. 



This variety, though similar in character, must 



