162 CATALOGUE OF THE MOLLUSCA 
below low-water mark. The plain variety only is found on this 
coast, which is the C. arctica of Montagu in the “ Testacea Britan- 
nica.” He afterwards united it with C. Huropea in the Sup- 
plement. 
Faminy. Naticipa, Gray. 
64. NATICA, Adanson. 
1. N. catena, Da Costa. 
Nerita glaucina, Mont. Test. Brit. 469. 
Natica monilifera, Lam. Anim. s. Vert. 2nd Ed. viii. 638. 
On sandy shores, not common. Embleton Bay, rare—WMr. R. 
Limbleton. Seaton Carew.—Mr. W. Backhouse. Whitburn.— 
Rev. G. C. Abbes. 
2. N. Aupert, Porbes. 
Nerita glaucina, var. B., Turt. Conch. Dict. 125. 
Natica Alderi, Forbes Mal. Monen. 31, t. 2, f 6, 7. Thorpe 
Brit. Mar. Conch. 148, f. 82. 
From the coralline zone, common. Frequently met with in 
the stomachs of haddocks. 
We have seldom, if ever, observed this species cast on shore. 
It seems to live in deepish water on our coast, though on the 
western coast of Scotland near Ardrossan it inhabits the sand 
near low water mark, and is thrown up plentifully on the beach 
along with WV. catena. We have observed that several other mol- 
lusks inhabit shallower water on the western coast of Great 
Britain than they do with us. 
The Rev. G. C. Abbes and Mr. R. Howse have met with the 
plain variety at Whitburn. 
3. N. rvtricata, Don. 
Nerita intricata, Don. Brit. Shells, t. 169. 
From the fishing boats, Cullercoats—J. H. 1. 
4. N. Montagu, Lorbes. 
Nerita rufa, Mont. Test. Brit. Supp. 150,+. 30,f32 (excl. var.) 
Natica Montagui, Forbes Mal. Monen. 32, t. 2, f. 3-9. 
From the coralline and deep-water zones, rather rare, occa. 
sionally met with in the fishing boats at Cullercoats and Whit- 
burn. Mr. Howse dredged several living specimens in seventeen 
