Bibliographical Notice. 337 



of regeneration; but these are not the only conditions of division. 

 It is especially easy in flat animals or in those which are 

 slender and elongated ; when the animal is equally developed 

 in the three dimensions, the softness and contractility of the 

 body must be greater. Another condition is that the various 

 sections of the body must not differ too much as regards their 

 importance to the whole; but recent observations, showing 

 that even the head and fore part of the body of the CliEetopod 

 Annelides may be regenerated in many cases*, indicate that 

 this condition is not one of the most difficult to fulfil. 



[To be continued.] 



BIBLIOGRAPHICAL NOTICE. 



Jottings during the Cruise of H.M.S. Curacoa among the South-Sea 

 Islands in 1865. By Julius L. Beenchuey, M.A., F.R.G.S. With 

 numerous Illustrations and Natural History Notices. Boy. 8vo, 

 pp. 487, pis. 50. Longmans, London : 1873. 



Theee can be hardly any lover of natural history who has not 

 longed to visit the islands of the Pacific, and none who has not envied 

 the good fortune of Banks, Solander, and the two Forsters — voyagers 

 to whom nearly each plant and animal they saw was new, while 

 they were conscious of its novelty. That golden age is, indeed, ra- 

 pidly passing away ; but the present generation need not sigh in 

 vain for worlds to explore. There are still hundreds of islands, not 

 to say clusters of islands, every one a world in itself, untrodden 

 by any white foot save that of the missionary or the whaler ; and 

 it needs no saying that neither the fisher of men nor the fisher of 



parallel with that of the diameter ; but from the time when the latter 

 has acquired a certain magnitude, we do not see so clearly that there is a 

 connexion between the two quantities. Individuality is manifested by 

 one individual being provided earlier than another with the greater part 

 of its arms, or by its growing more slowly, but devoting its growth to the 

 formation of new arms. 



I have at my disposal only three specimens of A. microbrachia, of which 

 the diameter varies from 3 to 5 inches, whilst the number of arms at 

 the same time increases from 32 to 38. In four specimens of A. Ku- 

 binji/i measuring from If to 6 inches, the number of arms varies only 

 from 21 to 24, and there is no parallelism between the number and the 

 diameter ; of A. Cummingii I only possess a single specimen (7\ inches, 

 41 arms). In A. (Pycnopodia) helianthoides also it seems that new arms 

 spring between the old ones. 



* See Kinberg, " Om Regeneration af hufvudet och de friimre segmeu- 

 terna hos en Annulat" (CEfvers. Yetensk. Akad. Forhandl. 1867), and 

 Ehlers, ' Die Neubildung des Kopfes und des vorderen Korpertheils bei 

 polychaten Anneliden' (1869). 



