266 THE VOYAGE OF H.M.S. CHALLENGER. 



Tribe I. UNCINATAEIA, F. E. Scliulze (Pis. LXXI.-XCVIIL). 



Dictyoniua with uncinates. 



Subtribe I. Clavularia, F. E. Schulze (Pis. LXXI.-LXXVL). 

 Besides the pentact hypodermalia and hypogastralia radially disposed clavuljB occur. 



Family F A E R E i D ^. (Pis. LXXI.-LXXVL). 



The dictyonal framework forms in the youngest regions of the body a single-layered 

 network with quadrate meshes, from the nodes of which conical protuberances project on 

 either side towards the dermal and gastral surfaces. 



Genus Farrea, Bowerbank (Pis. LXXL-LXXVL). 



1857. Owen, Trans. Linn. Soc. Lond., vol. xxiii., jjI. xxi. figs. 8, 9. 

 1862. Bowerbank, Phil. Trans., vol. clii. p. 747, Tab. xxxii. fig. 7. 

 1864. Bowerbank, Mon. Brit. Spong., Ed. i. ]). 204. 

 1864. Kblliker, Icones bistologicas. 



1867. Gray, Proc. Zool. Soc. Lond., p. 492, Tabs, xxvii., xsviii. 



1868. Bowerbank, Proc. Zool. Soc. Lond., p. 118. 



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



1869. Wyville-Thomson, Phil. Trans., vol. clix. p. 701. 



1870. 0. Schmidt, Grundziige einer Spongienfauna des atlantischen Gebietes, p. 16. 

 1870. Saville Kent, Monthly Mior. Journ., p. 241. 



1873. Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. xii. pp. 17, 349. 



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



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



1876. Bowerbank, Proc. ZooL Soc. Lond., p. 535. 



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



1877. Sollas, Ann. and Mag. Nat. Hist., ser. 4, vol. xix. p. 1. 

 1880. 0. Schmidt, Spongien des Meerbusens von Mexico, p. 43. 

 1885. Carter, Ann. and Mag. Nat. Hist., ser. 5, voL xv. p. 387. 



History. — In the root-tuft of that beautiful siliceous sponge which was on one 

 occasion presented to Captain Etheridge by the king of the Seychelles, and which, after 

 it passed into the possession of Dr. Arthur Farre, was accurately studied by Richard 

 Owen, and described under the name of Euplectella cucumer,^ fragments of the sUiceous 

 skeletons of other sponges were entangled. Some of these skeletal fragments, which had 

 already been observed by Dr. Farre, were subjected by Owen, along with the Euplectella, 

 to a closer examination, and he even figured two of them, both in the natural size and 



1 Trans. Linn. Soc. Lond., vol. xxiii., pi. xxi., 1857. 



