Localities of British Plants, 243 



• 

 number from two to ten, attach themselves to the interior of 

 the mantle, near its connexion with the neck of the animal. 

 This troublesome parasite does not seem to be stationary, 

 since I have not unfrequently observed it to change its place, 

 and take up, perhaps, more commodious quarters in another 

 shell. This Gordius probably constitutes part of the food of 

 the smaller Dytiscidae. After I had put two sorts (the D. 

 trifidus and D. crassicornis M.) into the glass vessel where 

 the Limnei were kept, I could not detect any signs of the 

 Gordii ; though in other cases I have known them to survive 

 even after their guardians had begun to putrefy ." 



Facts on the Habits of the Common A'scaris. [A. ? \umbri- 

 coides Lin. (p. 239.)] — It propagates by eggs, which fill the 

 greater part of its body. These are of an oval shape, and are 

 in such numbers, that I cannot form any idea of the amount 

 of them : there must be many thousands within each animal. 

 This creature has an instrument in its mouth, which may be 

 protruded by pressure : it consists of a sheath, and five or 

 six darts, shaped like those of a gnat, but not barbed. — 

 E. T.S. Feb. 17. 1834. 



Art. V. Localities of several Species of British Plants, observed 

 during the Summer of 1835. By Charles C. Babington, M.A. 

 F.L.S. F.G.S., &c, 



K'RABispetr&a. On the lower part of the precipice called 

 Clogwyn ddur Arddu, Snowdon. July 29. It does not occur 

 in plenty on any other part of these mountains which I have 

 examined. Clogwyn ddur Arddu is the lofty mural rock (in 

 which there is a copper mine), having a small lake at its foot, 

 which fronts the tourist during the first half of his ascent of 

 the mountain from Llanberis. 



Subuldria aqudtica. In plenty in Llyn Idwel, a lake situ- 

 ated in what is probably the most romantic mountain hollow 

 of Caernarvonshire. Aug. 1. It is most easily accessible 

 from Llyn Ogwen, on the great Holyhead road, being about 

 half a mile from that lake. At its upper end, a small stream 

 flows into it from the elevated lake Llyn y Cwn, passing down 

 through a cleft in the rock called Twll ddu. These two 

 places form one of the most celebrated botanical stations in 

 Wales ; and, being many hundred feet above Llyn Idwel, will, 

 perhaps, be the more conveniently reached from Llanberis by 

 ascending the Glyder at a spot nearly opposite the church of 

 that place. It is necessary to distinguish between Llyn y 



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