16 



The Naturalist. 



Common Sandpiper. — Common in spring and summer from the 

 confluence to nearly the source of the river, and extremely- 

 abundant on the three reservoirs. 



Curlew. — Common on the moorlands in spring and summer. 



Tern. — Species uncertain ; probably the common tern. In the late 

 summer small parties are frequently to be seen on the reservoir. 



Gull. — Species uncertain. During unsettled weather in spring and 

 summer, gulls are not uncommon on the Swinsty and Fewston 

 reservoirs. From their size they appear to be either the herring 

 or the lesser black-backed gulls. 



EEFTILES AND AMFEIBIANS. 

 These, like the mammalia, have not received special attention. 

 Clarke notes the following : — 



Common Lizard. — On the dry moorlands. 

 Common Frog. — Abundant. 

 Common Toad. — do. 



FISHES. 



Minnow. — Abundant in the reservoirs and in Thackray beck. 

 Golden Tench (a varieiy of the Common Tench). — Lord Walsingham 



has introduced this fish into Fewston reservoir. 

 Loach.— Occurs in Swinsty reservoir. 



Trout. — Abundant, especially in the river above Blubberhouses and 



in the reservoirs. In the latter it attains to a large size. 

 Loch Leven Trout. — This interesting species has been introduced 



into the river by Lord Walsingham. 

 Grayling. — Has been observed in some numbers about Dob Park, 



going up stream to spawn. It is questionable if this species is not 



now resident in Lindley reservoir. 

 Sharpnosed Eel.— Occurs in the reservoirs. 



MOLLUSC A. 



The very scanty list of mollusca here given is based upon the few 

 specimens which casual visits to the valley have yielded to 

 Koebuck, and as a matter of fact it represents the product of but a 

 few hours' actual collecting. Further research will add numerous 

 species, although the district is not one from which a very rich result 

 may be expected, owing to the uniformity of the geological structure, 

 and more especially its deficiency of calcareous rock. The presence 

 of Zonites excavatus, and the absence of limestone-frequenting species, 

 are sufficiently demonstrative of this. 



