Qttartcny Journal of Conchology. 329 



Trochus montacuti, Wood. With TrocJiiis tumiJus, but not 

 nearly so common. 



Trochus striatus, Z. On Zostera near low-uater mark ; 

 local, but very abundant off the Ghitncy Esplanade ; the 

 largest are in 6-8 f. near the mouth of St Peter's Harbour. 



Trochus exasperatus, F./ui. On Zostera and Fuci, at low- 

 water mark ; Bordeaux Harbour, Herm ; abundant. 



Trochus zizyphinus, L. Common everywhere, under rock 

 ledges and stones. A variety from deep water is, like Trochus 

 7!iagus, much thinner and more sharply cut. 



Phasianella PULLAj L. On laminari.ie, (L'Ancresse Bay), 

 under stones (Herm); 15-20 fathoms off St. Peter's Port; 

 common. 



LiTTORiNA OBTUSATA, Z, Everywhere, on fuci. 



LiTTORiNA NERiToiDES, Z. On all the rocky coasts, 

 Littorina rudis, Maton. Abundant. 



Var. SAXATiLis. On rocks everywhere ; another com- 

 mon variety exhibits black bands on a Vvhite ground, while a 

 third, found at Sark, is a bright red colour. 



RissOA STRiATULA, Moiit. Dead specimens dredged in the shell 

 sand. 

 ', RissOA CANCELLATA, Da Costa. More common than the last. 



RissoA PARVA, Da Costa. Abundant everywhere on seaweeds at 



low water. 

 RissOA COSTULATA, Aider. On Zostera at low water mark, with 



Trochus striatus. 



RissoA STRIATA, Adams. Under large stones between tide marks; 

 living with Melampus biderUatus, at Sark. 



RissoA CINGILLUS, ALmt. With the last, but individually more 

 abundant and widely distributed. 



Var. RUPESTRis. With the type. 



