OF NORTHUMBERLAND AND DURHAM. 153 
In sand at Tynemouth, Cullercoats, and Whitburn, rare— 
Alive in pools among the rocks at Cullercoats.—A. H. 
52. SKENEA, Fleming. 
1. §. puanorsis, Fab. 
Helix depressa, Mont. Test. Brit. 439, t. 13, f 5, 
On small sea-weeds between tide-marks, common. 
2. S. divisa, “ Adams?’ Flem. 
Skenea divisa, Flem. Brit. Anim. 314. 
On small sea-weeds between tide-marks, rare.-—J. A. 
Famity. Trocuipm, DOrbigny. 
53. TROCHUS, Linneus. 
1. T. macus, Linn. 
Trochus magus, Mont. Test. Brit. 283. 
Two or three specimens have been found on the beach at Sea- 
ton Carew by Miss Elizabeth Backhouse, and it is also in Sir 
Cuthbert Sharp’s list of Hartlepool shells ; but we have no re- 
cord of its occurrence on any other part of the coast. It isa 
doubtful native of the north-eastern coast of Britain, and may 
have been introduced in ballast. Mr. Bean informs us that one 
dead shell has been found at Scarborough. 
2. T. cinERARIUS, Linn. 
Trochus cinerarius, Mont. Test. Brit. 284. 
In pools among the rocks between tide-marks, common. 
3. T. rumipus, Mont. 
Trochus tumidus, Mont. Test. Brit. 280, t. 10, f. 4. 
From deepish water, frequent. 
4, T, mintEeRanvs, Phil. 
Trochus Martini, Smith in Wern. Mem. viii. 51, t. 1, f£ 26. 
Thorpe Brit. Mar. Conch. 164, f. 36. 
Two or three specimens have been obtained from the deep- 
water fishing boats by Mr. W. King, and Mr. R. Howse. Mr. 
Embleton has also got it at Embleton. 
5. T. zizypuinus, Linn. 
Trochus zizyphinus, Mont. Test. Brit. 274. 
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