_ MARINE DIATOMACEH OF THE L.M.B.C. DISTRICT. 127 
S. gallon, Ehr. Isle of Man, rare. 
8. obtusa, W. Sm. Helsby Marsh, common. 
S. pulchella, var. acicularis, Kutz. Mostyn, common. 
4 3 Toxonidia (Dn.) gregoriana, Dn. Connah’s Quay, rare. 
* T. insignis, Dn. Surface of Dee, rare. 
 -*Triceratiwm, (Ehr.) brightwellit, West. Surface of Dee, 
-yare. 
T’. favus, Hhr. Connah’s Quay, very rare. 
T. striolatus, Khr. Surface of Dee, rare. 
T. favus, which is so common in the estuary of the 
Thames, is a very rare form in this district, and not 
common on the west side of England. 

