SMART AND COOKE : MARINE SHELLS OF SCILLY. 30I 



Ovula patula Penn. — Dead specimens only, from Menavawr 



and inside Round Island. 

 Cylichna umbilicata Mont. — Dead specimens from the 



muddy sand in Crow Sound, common. 

 C. cylindracea Penn. — With the above, but young and 



remarkably slender. 

 Utriculus mammillatus Phil. — Guther's beach, dead, rare. 

 U. truncatulus Brug — From the Menavawr gravel, very 



abundant. 

 U. obtusus Mont. — Crow Sound and from Guther's beach, but 



somewhat rare. 

 U. obtusus var. Lajonkaireana Mont. — With the type. 

 U. hyalinus Turt. — One or two specimens only, from the deep 



water. 

 Actaeon tornatilis L. — Crow Sound, and in thick mud under 



Round Island, but small and not common. 

 Bulla hydatis L. — Among Zostera at extreme low water mark, 



but very irregular in its habits : sometimes many occur, at 



others not one will be seen. 

 Scaphander lignarlus L. — Living in mud inside Round 



Island ; also in sand between Samson and Tresco, but never 



common. 

 Phi line scabra Miill. — Dead specimens very common in 



muddy sand at 8 fms., Crow Sound. 

 Pleurobranchus membranaceus Mont. — On Zostera near 



Carnea at very low water. 

 P. plumula Mont.— Dredged in the Roadstead, St. Mary's. 

 Melampus bidentatus Mont. — Under stones, low water 



mark, Carnea ; Quay at St. Mary's ; dead at Guther's 



beach. 

 M. myosotis Drap. — Thrown up on beach, but very rare ; 



never found alive. 

 Otina Otis Turt. — Piper's Hole, Tresco, common. After 



many days' searching along the rocks we were rewarded 



by finding this species in the above locality. It no doubt 



