186 TEE ZOOLOGIST. 



Marine Univalves. 



Chiton cinereus, Linn. — " Scarce, harbour mouth " (B.). 



Patella vulgata, Linn. — C. " Gorleston Breakwater" (B.). 



Helcion pellucidum, Linn. — " In drift" (B.). 



Tectum virginea, Miill.— R. " In drift " (B.). 



Trochus cinerarius, Linn. Ash-coloured Topshell. — F. I have 

 received examples from the shrimp-nets. 



T. zizyphinus, Linn. — I have had examples taken in shrimp-nets. 



Lacuna divaricata, Fabr. — " Occasionally in drift " (B.). 



L. pallidula, Da Costa. — " Few occasionally in drift" (B.). 



L. var. gracilior. — " One specimen, Yarmouth" (A. Mayfield). 



Littorina obtusata, Linn. — " Harbour mouth" (H.), (B.). 



L. rudis, Maton. — R. Have found this on Breydon, and had an 

 example or two from the shrimpers. 



L. littorea, Linn. Common Winkle. — C. Very fine examples are 

 abundant on Breydon, on the stretches of Potamogeton. All through 

 summer boys, and men occasionally, gather these, and sell for 

 food. Myriads of the smaller shells, with Hydrobia and others, are 

 gathered by the action of the tides and eddies into angles in the walls, 

 known locally as " shell corners," and on a small scale form copies of 

 the crag formations. 



L. neritoides, Linn. — C. " Common on Breydon walls under the 

 bladder-wrack " (B.). 



Rissoa parva, Da Costa. — R. " Drift" (B.). 



R. var. interrupta. — C. " Abundant in drift" (B.). 



R. inconspicua, Alder. — R. " Rare on seaweed " (B.). 



Hydrobia ulva, Penn. — C. Every blade of Potamogeton is in 

 summer swarmed with this species. Various shore-birds and Palmi- 

 pedes feed in turn upon it. 



H. ventrosa, Mont. — C. " Common on Breydon " (B.). " Plenti- 

 ful in a ditch near Breydon " (A.M.). 



H. var. pellucida. — Breydon (A. M.). 



Odostomia unidentata, Mont. — " Rare. Drift " (B.). 



0. dolioliformis, Jeffr.— "Rare. Drift" (B.). 



Natica catena, Da Costa. — F. C. Several examples brought me by 

 shrimpers. 



IV. alderi, Forb. — 0. Brought me by shrimpers. 



Cerithium reticulatum, Da Costa. R. "Harbour mouth" (B.). 



Purpura lapillus, Linn. — F. Breydon. Several also brought me 

 by shrimpers. 



P. lapillus var. imbricata. — (H.). 



