Land and Freshivater Shells found in Caithness. 163 



new species, they have greatly assisted in extending locali- 

 ties, and from their quick observation I have great hopes. 



At present, until more facts have been collected, it is not 

 desirable to enter on a comparison of this district with 

 others, nor anything else beyond giving the numbers stated 

 in three local lists which I have. First, Mr Alder's " Cata- 

 logue of Northumberland and Durham that of Aberdeen, 

 by the late Professor Macgillivray, in the work on " Dee 

 Side ; " and that of the " Province of Moray," by the Eev. 

 Dr Gordon, published in the " Zoologist." 



Northumberland and Durham, 80 species. 



Aberdeen, .... 53 ,, 



Province of Moray, . . 46 ,, 



Caithness, .... 30 ,, 



I would here remark, that when the well-known fact of 

 the diminution of the pulmonifera as we proceed north is 

 taken into consideration, with the little examination made, 

 and the small area included in our list — viz., Caithness 

 only — there is little cause for either surprise or dissatis- 

 faction, and it only requires more eyes and willing hands of 

 the lovers of Carnabia to be set in motion, to increase the 

 number for a supplementary list. When this is the case, 

 I hope to return to the subject. For the present be pleased 

 to accept of this as an instalment only. 



N.B. — Those marked with an asterisk (*) have also been 

 found in the marls of Caithness. 



* Sphcerium corneum, Brickigoe, River of Wick, &c. 

 Pisidium nitidum, River of Wick, and Loch of Sarclet. 

 Unio margaratifer, River of Wick — rather plentiful. 



* Valvata piscinalis, Loch of Brickigo, and River of Wick. 



* Planorbis nautilus, Reiss, and near the Mill of Thrumster. 



* P. albus, very rare, Loch of Brickigo. 



P. glaber, Reiss, and near the Mill of Thrumster. Mr Jeffreys 

 says: — " These are finer than usual, indeed very near as large as some 

 Mr Bridgman found near Norwich. 



Planorbis spirobis, same localities as the last. Jeffreys records it as 

 " from the Moray Firth district to the Channel Islands." 



* P. contortus, River of Wick and Loch of Brickigo. 



* Linncea pereger, Wick, Ulbster, &c. &c 

 L. truncatulus, Southhead, Wick, &c. 



Ancylus Jluviatilis, plentiful in many localities. Jeffreys says — 

 vol. ill. Y 



I 



