148 Rev. Canon Norman's Revision 



not be confounded with var. Gunneri of the fol- 

 lowin;^ species. 



Jeffreys (B.C.iv.p. 321) points out the distinctions 

 between this and T. clathratus, but in his subse- 

 quent papers he united them. It was taken in the 

 'Lightning' expedition in 530 fath. (St. 12). 



[Trophon clathratus (Linn.) . 



Jeffreys, in his account of ' Valorous ' Mollusca (Ann. & 

 Mag. Nat. Hist. ser. 4, vol. xix. 1877, p. 325), gives * Porcu- 

 pine ' Expedition, 1869, off the Hebrides, 165-580 fath. No 

 station has the exact depth of 165, but St. 60 is 167 fath., 

 and 580 fath. is the deptli of St. 59 ; but neither of these two 

 stations is within the I3ritish area.] 



4. Trophon carinatus, Jeffreys. 



Trophon carinattts, Jeffreys, Mollusca of ' Triton,' Proc. Zool. Soc. 1883, 

 p. 395, pi. xliv. fig. 5. 



A fragment thus named, with the following description : — 

 *' Shell distinguishable from T. clathratus in having a promi- 

 nent keel in the middle of each whorl ; the laminar ribs are 

 fewer and obtusely angulated ; the spiral stria?, which cover 

 the interstices of the ribs, are numerous, regular, compara- 

 tively strong, and flexuous or curved ; colour white j inner Up 

 glazed and lustrous. L. (if perfect) 0-6. B. 0-25." 



St. 13, lat. 59° 51' N., long. &° 18' W., 570 fath. 



This may, I think, prove to be the T. lacunellus of Dall, 

 ' Blake ' Mollusca (Bull. Mus. Comp. Zool. xviii. 1889, p. 205, 

 pi. XV. fig. 4), or T. aculeatus, Watson, ' Challenger.' 



Genus 3. PuEPURA, Brugui^re. 

 1. Purpura lapillus (Linn.). 



Var. 1. imbricata, Lamk. 



I am indebted to the kindness of Mrs. Stebbing 

 for a reversed monstrosity of P. lapillus found by her 

 living on the North Wales coast. 



[Purpura hcemastoma (Linn.), Jeffr. B. C. iv. p. 283. 



I am not aware that the occurrence of this species at Guern- 

 sey has been confirmed. It may reasonably be expected there, 

 as it occurs on the opposite coast of France (P. Fischer).'] 



