242 APPENDIX. 



edge, and likewise some on the western side, between which 

 there is a depth of about 12 fathoms : northward, a great 

 bank extends. I cannot (probably owing to the want of per- 

 fect charts) refer this reef and bank to any class ; therefore 

 not coloured. — He de Sable is a little island, lying west of C. 

 Carajos, only some toises in height (Voyage of the Favourite, 

 vol. i. p. 130) ; it is surrounded by reefs ; but its structure is 

 unintelligible to me. There are some small banks north of it, 

 of which I can find no clear account. — Mauritius : the reefs 

 round this island have been described in the chapter on fring- 

 ing-reefs ; coloured red. — Rodriguez : the coral-reefs here 

 are very extensive ; in one part they project even five miles 

 from the shore. As far as I can make out, there is no deep- 

 water channel within them ; and the sea outside does not 

 deepen very suddenly. The outline, however, of the land 

 appears to be (Life of Sir J. Makintosh, vol. ii. p. 165) 

 hilly and rugged. I am unable to decide whether these 

 reefs belong to the barrier class, as seems probab]e from 

 their great extension, or to the fringing class ; uncoloured. 

 Bourbon : the greater part of the shores of this island are 

 without reefs ; but Captain Carmichael (Hooker's Bot. Misc.) 

 states that a portion, 15 miles in length, on the S.E. side, 

 is imperfectly fringed with coral-reefs : I have not thought 

 this sufficient evidence for colouring the island. 



Seychelles. — The rocky islands of primary formation, 

 composing this group, rise from a very extensive and toler- 

 ably level bank, having a depth of between 20 and 40 

 fathoms. In Captain Owen's chart, and in that in the atlas 

 of the Voyage of the Favourite, it appears that the east side 

 of Make and the adjoining islets of St. Anne and Cerf, are 

 regularly fringed by coral-reefs. A portion of the S.E. part 

 of Curieuse Island, the N. and part of the S.W. shore of 

 Praslin Island, and the whole west side of Digue Island, appear 

 fringed. From a MS. account of these islands by Captain F. 

 Moresby, in the Admiralty, it appears that Silhouette is also 



