4424 Mollusks. 



In districts where attention is paid to the indigenous Mollusca, a 

 few shells, more than doubtful intruders, or having no good claim to 

 denizenship, generally come under the eye, and are most properly no- 

 ticed by the naturalist. Neritina fluviatilis and Paludina vivipara are 

 often met with in such circumstances, being carried in ballast or 

 otherwise beyond their native localities. Thus the former has been 

 got from Findhorn by Mr. Murray, and Mr. Martin found a shell of 

 Paludina vivipara in the estuary of the Lossie. The latter has also 

 been recently picked up iu a mutilated state among sea-shells on the 

 N.E. of Findhorn. 



Nerita-like Periwinkle, Littorina neritoides. Burghead, Mr. Mur- 

 ray. Abundant on the rocks about high-water mark between Burg- 

 head and Cummingston, August, 1853; Stotfield, Covesea, &c, Mr. 

 Macdonald. 



Common Periwinkle or " Buckie," Littorina littorea, [Turbo lit- 

 torea, Flem.) Abundant. This is the only univalve that is ever, and 

 that but rarely, collected and exposed for sale in the market-towns 

 bordering on the Moray Firth. 



Coarse Periwinkle, Littorina rudis, (Turbo rudis, Flem.) Very 

 abundant, and in many of its varieties. 



Flat-topped Periwinkle, Littorina litt oralis, (Nerita littoralis, 

 Flem. ; Littorina neritoides, Mac.) Everywhere abundant along the 

 coast. 



Pallid Lacuna, Lacuna pallidula, (Natica pallidula, Flem.) Fre- 

 quent. 



Banded pink-tipped Lacuna, Lacuna puteolus, (Turbo fasciatus 

 and Natica lacuna, Flem. ; L. fasciata and sulcata, Mac.) Found 

 among shell-sand from the South-eastern shores of Caithness. 



Variable Lacuna, Lacuna vincta, (Turbo quadrifasciata, Flem.) 

 Common ; often in shell-sand. 



Thickened Lacuna, Lacuna crassior, (Turbo crassior, Flem.) A 

 specimen dredged by Mr. Macdonald in the Firth. It has also been 

 found in shell-sand. 



The Shetland Rissoa, Rissoa Zetlandica, (Cyclostoma Zetlandica, 

 Flem.) Found in shell-sand from S.E. of Caithness. 



Bean's Rissoa, Rissoa Beanii. Also found, with the preceding, in 

 the Caithness shell- sand, but it seems to be more rare. 



Punctured Rissoa, Rissoa punctura, (Cingula reticulata, Flem. ; R. 

 puncturata, Mac.) Occasionally found among shell-sand. Frequent 

 among that from Caithness. Mr. Murray has found it alive among 

 the roots of Laminaria digitata at Burghead. 



