APPENDIX. NOTES. 4 1 1 



night, heaps of small stones were raised round the entrance 

 of the worm-holes, in his gravel walks. These gravel stones 

 appeared as if they were collected and transported by the 

 worms themselves, and placed to defend the mouth of their 

 retreats; but how this was effected he could not conjecture. 

 Some of the stones were as big as a bean, and appeared to 

 have been embedded in the rolled gravel. Mr. T. thinks 

 that the object of these erections, as well as that of the 

 earth-casts, is to keep out the wet. 



NOTE 27, vol. ii. p. 60. There may be herbivorous 

 species amongst the Crustaceans, as well as in almost every 

 other class of animals. In a letter I lately received from 

 the Rev. C. Hardy, dated Hayling Vicarage, Havant, Hants, 

 he informs me that he has frequently observed small Crus- 

 taceans in vast numbers devouring the sea-weeds cast up by 

 the waves ; and apparently when their hunger was satisfied 

 burying beneath the sands fragments of what remained. 



NOTE 28, p. 224. To erect her three-floored houses. The 

 compound rpiugotpog may be rendered either three-storied, 

 three-roofed, or three-floored. But as the comb of the 

 hive-bee consists of only two stories, one of the two latter 

 terms should be employed. 



NOTE 29, p. 264. But to a peculiar mechanism of its 

 bones contained in a ligamentous sheath. In a letter recently 

 received from him, Mr. Helsham thus further explains this 

 mechanism. " Like the ant-eaters the wryneck can pro- 

 trude its tongue to a very great length, not because that 

 member is in itself contractile or extensile, but because its 

 bone, dividing at the larynx, and passing first backwards 

 and encircling the occiput on either side, turns upward 



