228 APPENDIX. No. V. 



millims. in length, being about double that of Gould's figure. 

 Hancock mentions one from the west coast of Davis Strait, 

 which was about five-eighths of an inch (or 16 millims.) long. 



Natica affinis, Grmelin. 



Hab. Dobbin Bay, 30 fms., bottom stones and mud 

 (Hart, August, 1876). 



Only a single small specimen was obtained, which is re- 

 markable for having the spire rather more elevated than 

 usual. 



Trochus (Margarita) umbilicalis, Broderip and Sowerby. 



Hab. Franklin Pierce Bay, 15 fms.; Mushroom Point, 

 82° 29' N. (Feilden). 



This species is also reported by Jeffreys, 'Annals and 

 Mag. Nat. Hist.' 1877, March, p. 237, from 'Discovery Bay, 

 and fossil in Cane Valley,' from specimens collected by 

 Captain Feilden during the expedition. 



Trochus (Margarita) glauca, Moller. 



Hab. With the preceding species at Franklin Pierce Bay 



(Feilden). 



Trochus (Margarita) helicinus, Fabricius. 

 Hab. Franklin Pierce Bay (Feilden). 



Trochus (Margarita), sp. jun. 



Hab. Cape Frazer (Feilden). 



This shell may be but a young specimen of Margarita 

 striata of Broderip and Sowerby ; but it differs from typical 

 examples in the spire being comparatively small in propor- 

 tion to the body-whorl, the base of which is almost destitute 

 of revolving striae ; the umbilicus is larger and not bordered 

 by a thickish ridge as is usually the case in this species. 



