REPORT ON THE HEXACTINELLIDA. 53 



Geuus 1. Euplectdla, Oweu (Pis. I.-VL; PI. XIII. figs. 5-7; PI. XIV. figs. 1-5). 



1841. Owen, Proc. Zool. Soc. Lond., vol. ix. pp. 3-5. 



1843. Owen, Trans. ZooL Soc. Lond., vol. iii. (2) pp. 203-206, tab. xiii. 



1847. Toiilmin-Smith, Ann. and Mag. ISTat. Hist., ser. 2, vol. xx. p. 176. 



1857. Owen, Trans. Linn. Soc. Lond., vol. x\ii. (2) p. 117. 



1858. Bowerbank, Phil. Trans., vol. cxlviii. (2) p. 279. 



1861. Ehrenberg, Monatsber. d. k. preuss Akad. d. Wiss. Berlin, 1, p. 448. 



1862. Bowerbank, PliiL Trans., vol. clii. (2) p. 747. 

 1864. Bowerbank, Monograph Brit. Spongiadre, vol. i. 



1 866. Gray, Ann. and Mag. Nat. Hist., ser. 3, vol. xviii. p. 487. 



1867. Bowerbank, Proc. Zool. Soc. Lond., pp. 18, 351. 

 1867. Gray, Proc. Zool. Soc. Lond., p. 492. 



1867. Semper, Archiv f. Naturgesch. vol. xxxiii. 1, j). 81. 



1868. Gray, Ann. and Mag. Nat. Hist., ser. 4, vol. i. p. 161. 

 1868. Gray, Ann. and Mag. Nat. Hist., ser. 4, vol. ii. p. 373. 

 1868. Marshall and Herklots, Archives NeerlandaLses, iii. p. 435. 



1868. Glaus, Ueber EuplecteUa aspergiUum. 



1869. Moore, Ann. and Mag. Nat. Hist., ser. 4, vol. iii. p. 196. 

 1869. Bowerbank, Proc. Zool. Soc. Lond., p. 66. 



1871. Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. viii. p. 330. 



1872. Gray, Ann. and Mag. Nat. Hist., ser. 4, vol. ix. p. 442: vol. x. p. 134. 



1873. Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. xii. p. 349. 



1873. "Wyville Thomson, Good Words, July, p. 510. 



1874. Th. Higgin, Ann. and Mag. Nat. Hist., ser. 4, vol. xiii. p. 44. 



1875. Bowerbank, Proc. Zool. Soc. Lond., p. 272. 



1875. Marshall, Zeitschr. f. wiss. Zool., Bd. xxv., Suppl., p. 142. 



1876. Willemoes-Suhm, Zeitschr. f. wiss. Zool., Bd. xxvi. p. Ixxiii. 



1876. Marshall, Zeitschr. f. wiss. Zool., Bd. xxvii. p. 113. 



1877. Wyville Thomson, The Atlantic, p. 138. 



1878. Chimmo, Natural History of EuplecteUa aspergillum. 



1879. Moseley, Notes by a Naturalist on the Challenger. 



1879. Agassiz, Bull. ilus. Comp. Zool., voL v. 



1880. 0. Schmidt, Spongien des Meerbusens von Mexico, vol. ii. p. 60. 



1880. E. E. Schuke, Trans. Roy. Soc. Edin., vol. xxix, (2) p. 661. 



1881. Witefield, Araer. Journ. Sci. and Arts, July and August. 

 1881. Milne-Edwards, Comptes rendus, t. xciii. pp. 876, 931. 

 1881. Walcott, Amer. Journ. Sci. and Arts, vol. xxii. pp. 394, 395. 

 1885. Filhol, La vie au fond des mers, p. 282. 



History. — After a preliminary communication which appeared in 1841,^ Owen pub- 

 lished in 1843 the first accurate description of EuplecteUa aspergillum^ In this some- 

 what brief, but precise and clear description of a well-preserved skeleton from the Philip- 

 pines, the structure, as seen by the naked eye, or under the magnifying power of a simple 

 lens, is so thoroughly investigated that later observers have had but little to add to it. 



As the most essential diff"erence between his EuplecteUa aspergiUum and the 

 Alcyoncellum speciosum, Quoy and Gaimard, Owen emphasises the fact that in EuplecteUa 



1 Proc. Zool. Soc. Lond., vol. ix. pp. 3-5. 



2 Trans. Zool. Soc. Lond., vol. iii. pp. 203-205, pi. xiii., 1843. 



