CUNDALL : ILFRACOMBE MOLLUSCA. 1 49 



Syndosmia alba. 



Solen siliqua. Fragments only. 



Tapes decussata. 



Tapes pullastra. 



Tellina solidula. 



Tellina tenuis. 



Tellina fabula. 



Thracia convexa. One specimen only. Barricane Bay. 



Thracia phased ina. Woollacombe. 



Trochus ziziphinus. Watermouth. 



Trochus cinereus. 



Trochus lineatus. 



Trochus umbilicatus. 



Turritella communis. Very young. Barricane Bay. 



Teredo megotara. 



Venus striata. 



Venus fasciata. 



Venus ovata. 



Limnsea stagnalis var. fragilis-variegata at Malham 



Tarn. — On the ist of September, Mr. J. D. Butterell and I 

 explored — by the aid of a boat, kindly placed at our disposal 

 by the High Sheriff of Yorkshire (Walter Morrison, Esq.), on 

 whose property the Tarn is — the moUuscan fauna of Malham 

 Tarn, which is situated on an elevated moorland plateau, 1250 

 feet above the sea level. As nothing had ever been recorded, 

 we were pleased at finding a rather unexpectedly rich fauna, 

 but as our exploration was incomplete and will be resumed at 

 an early opportunity, I will now only say that we found Limncea 

 stagnalis very abundant upon Potamogeton lucens near the N.E. 

 shore of the Tarn. The specimens were all of the. fragilis form, 

 rather small and very graceful in contour, and had the whorls 

 (except the final one) variegated with opaque white markings at 

 somewhat regular intervals. They thus differ from the Folke- 

 stone specimens of variegata, collected by Mrs. Fitzgerald, 

 which have the white markings only on the last or body whorl. 

 — Wm. Denison Roebuck, Sep. 21st, 1883. 



