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



1868. Clrtus, Ueber Euplectella aspergillum. 



1869. Wyvillc Thomson, Phil. Trans., vol. cli.K. p. 701. 

 1869. Bowerbank, Proc. ZooL Soe. Loud., p. 66. 



1869. 0. Schmidt. Mittheil. Naturw. Vereines Steierm., p. 89. 



1870. 0. Schmidt, Grundziige einer Spongienfauna des Atlant. Gebiet. 



1871. Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. vii. pp. 112-141, 268. 



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



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

 1875. Carter, Ann. and Mag. Nat. Hi.st., ser. 4, vol. xvi. p. 1. 

 1875. Marshall, Zeitsohr. f. wiss. Zool., Bd. xxv., Suppl. 



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



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



1877. Sollas, Ann. and Mag. Nat. Hist., ser. 4, voL xis. p. 1. 

 1877. Sollas, Ann. and Mag. Nat. Hist., ser. 4, vol. xx. p. 285. 



1877. Zittel, Abhandl. d. k. Baier. Akad. d. Wiss., Bd. xiii. p. 1. 



1878. Zittel, Abhandl. d. k. Baier. Akad. d. Wiss., Bd. xiv. pp. 21-48, 65. 



1879. Sollas, Journ. Roy. Micr. Soc, vol. ii. p. 122. 



1879. Agassiz, Bull. Mus. Comp. Zool., vol. v. p. 289. 



1880. 0. Schmidt, Die Spongien des Meerbusens von Mexico. 



History. — In 1841 a report was given by Stutchbury^ on a sjionge which was procured 

 at Barbados, one of the Antilles, and which exhibited a siliceous skeleton composed of 

 fine tubes with netted walls. The following diagnosis was proposed : — " Sponge fixed, 

 rigid, siliceous ; incurrent canals uniform in size ; excurrent canals large, forming deep 

 sinuosities on the outer surface, radiating from the root to the outer circumference." 

 Stutchbury named it Dactylocalyx pumiceus. 



Probably an illustrated notice which has passed from Rozier's Journal de Physique - 

 into Lichtenberg's Magazine ' also refers to the same genus. For a knowledge of this 

 publication, which is chiefly of interest on account of the date of its publication, I have 

 to thank Professor Marshall of Leipzig, who has sent me a copy of the text and of the 

 figures. The title in Lichtenberg's Magazine * is in the following words : — " Nachricht 

 von einem seltenen Polypengebiiude." " The structure of the polype in the first 

 copperplate shows a peculiar character and form not hitherto met with in any collection 

 of the products of the sea. It is dazzling white, resembles a net, and the magnifying 

 glass reveals a number of scattered chambers which are perforated in all directions ; it is 

 therefore unusually light, and is very readily pulverised. Its elegant form approaches 

 very near to tbat of the Coupe de Neptune ; but the resemblance is not confirmed when 

 the two polype forms are placed side by side. It is difficult to refer this structure to 

 its proper class. When kept under water it does not become larger, nor does it acquire 

 any flexibility. With nitric acid it does not effervesce. When a piece of it is calcined 



■ Proc. Zool. Soc. Lond., vol. ix. p. 86 ; Ann. and Mag. Nat. Hist., ser. 1, vol. is. p. 504. 

 "- October 1780. 



^ Magazinfiir das Neueste aiis der Physik mid Naturgeschichfe, Bd. i. pp. 68, 69, Gotha, 1781. 

 * Loc. cit., p. 68. 



