06 
R. striata, and var. arctica, Adams. 
Including II. arctica, Lov. 
The variety is our commonest shell in shell-sand on every 
part of the coast, hut the true species is only found with it in the 
proportion of 1 to 25. 
Family — Skeneid.e. 
Genus — Skenea. 
S. planorbis, Fair. 
Common on sea-weeds in rocky pools, on all parts of the coast. 
Family- — Turritellid.e. 
Genus — Turritella. 
T. tererra, Linn. 
Not uncommon, in deep water, in all our sandy bays. 
Family — Pyrajiidellidas. 
Genus — Odostojiia. 
0. spiralis, Mont. 
Common, in shell-sand. 
F amily — Naticid je . 
Genus — Natica. 
N. greenlandica, Bed;. 
Not uncommon, in deep water on all parts of the coast. 
N. alderi, Forbes. 
Common, in the coralline zone. 
N. montagui, Forbes. 
Common, with the last species. 
Family — Velutinid.e. 
Genus — Lamellaria. 
L. perspicua, Linn. 
Not common, on rocks in the laminarian zone. 
Family — Aporrhaid.e. 
Genus — Aporrhais. 
A. pes-pelicani, Linn. 
Not uncommon, in deep water. 
Family — Ruccinui.e. 
Gen us — P ur pur a . 
P. lapillus, Linn, (the “dog-whelk.”) 
