406 



A. E. Eaton — i^otes on some native EphemeridBe. [No. 4, 



Table XXV. Synopsis of origin of Coco Island flora. 



Species possibly introduced, for the presence of whicli no former land con- 

 nection need be necessary : — 288 



Introduced by living creatures 127 



By human agency ; (largely cosmopolitan species) 33 [ 



Intentionally ; (cultivated plants) 1 5| 



Unintentionally ; (weeds) IS) 



By birds, (perhaps also to a small extent by bats) 94 



Attached externally to their bodies 25 



Immediately ; (viscous- or prickly-fruited sp.) 9 

 By mud ; (species introduced by water-birds, 

 mainly from the northward) 16 



Carried in crops of birds ; (almost in equal propor- 

 tion from northward and from southward) 



As a natural sequence of their mode of life ; 

 (fleshy-fruited species) 55 



Accidentally, where bird must have been 

 destroyed to admit of germination of seeds ; 

 (by seed- and grain-eating birds) : [in- 

 directly due to agency of wind] • 14 



69 



By other natural agencies 



161 



By wind directly ; (sp. with seeds specialised for wind-cai-- 



riage ; also small-spored Cryptogams) 60 



By the sea ; (mainly Malayan species) 101 



Marine species ; (mainly Algce) 21 



Littoral species ; (mangrove-vegetation and beach- 

 forest species) ........ 80 



Species probably remanent and indicating former connection with adjacent 

 land, (apparently Indo-China) : — 70 



Total of Coco Island species 



358 



Kotes on some native Bphemeridoe in the Indian Museum, Gahutta. — 



By THE Rev. A. E. Eaton, M. A., F. E. S., communicated by 



The Superintendent of the Indian Museum. 



[Received I7th November, 1891 : Eead 2nd December, 1891.] 



The following notes concern a collection of 27 specimens of Ephe- 

 meridiB received from Calcutta in April 1889, comprising representatives 

 of 10 species or 6 genera, viz.: — 3 sp. of Palingenia, 1 of PolymitarcySi 

 1 of doubtful genus allied to Hexagenia, 2 of Ephemera, 1 of Ephemeret- 

 la and 2 of Epeorus, — all of ordinary dimensions. Fx'om the absence of 

 lesser species it may be inferred that these are the results of random 



