MOLLUSC A OF GREAT YARMOUTH. 187 



Buccinum undatum, Linn. Whelk. — C. Frequently taken in 

 shrimp-nets. Also " on cod-lines " (B.). 



Murex erinaceus, Linn. — F. Taken in shrimp -nets. 



Fusus antiquus, Linn. — 0. 



Nassa reticulata, Linn. — R. (B.). 



N. nitida, Jeffr.— « Few " (B.). 



N. incrassata, Strom. — (H.). 



Pleurotoma rufa, Mont. — (H.). 



P. turricula, Mont. — R. (B.). I have had one or two specimens 

 from a shrimp-boat. 



Utriculus obtusus, Mont. — " In drift" (B.). 



Cephalopoda. 



Sepia officinalis, Linn. Cuttlefish. — 0. Occasionally flings itself 

 ashore ; more often taken in the nets of the wolders and shrimpers. 

 Sometimes great numbers of the "bones" washed ashore. 



Octopus vulgaris, Lam. — R. Is occasionally taken. A fine ex- 

 ample entangled in a "drift" herring-net, October, 1901; another, 

 whose body was the size of a lemon, netted in 1902. This is rather 

 unusual with such deep-water species. 



Loligo vulgaris, Lam. Squid. — 0. Now and again found on the 

 beach. 



Sepolia Rondeletii, Leach. Little Squid. — Numbers taken in the 

 shrimp-nets every year. 



Fresh-water Bivalves. 

 Sphcerium corneum, Linn. — Common. Ditches on North Denes (B.). 

 Anodonta cygnea, Linn. Swan Mussel. — C. In Lound Reen, 

 Fritton, Filby, and other broads ; indeed, it is universally distributed. 

 Pisidium amnicum, Mull. — C. Abundant in dykes (B.). 



Fresh-water Univalves. 



Paludina vivipara, Linn. — F. I have met with this species on the 

 Bure, and in ditches at the west end of Caister. 



Bythinia tentacidata, Linn. — 0. " North Denes and Southtown 

 ditches " (B.). 



Planorbis vortex, Linn. — C. " North Denes and Southtown" (B.). 



P. complanatus, Linn. — C. "Common in dykes north of the 

 town " (B.). 



P. cornem, Linn. — C. Common in Southtown ditches. 



Physa hypnorum, Linn. — R. Found "near 'Spotted Cow'" (B.) ; 

 and Southtown marshes. 



