EEPORT ON THE MONAXONIDA. 51 



The species of this genus are very difficult to separate satisfactorily from one 

 another ; future researches may, very probably, by the discovery of intermediate forms, 

 render possible the union of some which are at present described as distinct. 



Tedania digitata, Schmidt (PI. XL fig. 3). 



1862. Reniera digitata, Schmidt, Spong. Adriat. Meer., p. 75, PI. vii. fig. 11. 

 1864. „ amhigua, Schmidt, Spong. Adriat. Meer., Suppl., p. 39. 



1867. Tedania digitata et amUgiia, Gray, Proc. Zool. Soc. Lond., May 1867, p. 520. 



1868. Reniera muggiana, Schmidt, Spong. d. Kiiste v. Algier., p. 28. 



This widely distributed species has been sufficiently described by previous writers;* 

 a number of specimens, varying in form from massive to digitate cylindrical (PI. XI. 

 fig. 3), were obtained by the Challenger, off Port Jackson. 



Locality. — Off Port Jackson, 6 to 35 fathoms, several specimens, mostly rather 

 fragmentary. 



Habitat. — Mediterranean (Schmidt) ; Atlantic (Schmidt) ; Antigua (Carter) ; Mozam- 

 bique, Marie Louise Island, Amirante Group (Ridley, " Alert") ; Kurrachee (Coll. Brit. 

 Mus.). Port Jackson (Challenger) ; Alert and Thursday Islands and Prince of Wales 

 Channel, Torres Strait ; Port Darwin (Ridley, " Alert "). 



Tedania digitata, 'v&v. fibrosa, nov. 



A single rather large, massive specimen, distinguished from the type by the very 

 slender spicules and the distinct primary fibre. 



Spicules. — (1) Smooth styli, measuring about 0*18 by 0"005 mm.; (2) double headed 

 cylindricals (tylota), with minutely spined heads, measuring about 0'21 by 0"0024 mm.; 

 (3) very fine, scattered rhaphides. 



Locality. — Off Port Jackson, 7 fathoms. One specimen. 



Tedania digitata, var. hermudensis, nov. 



A single small, massive specimen from Bermuda, of a pale yeUow colour and with 

 small scattered oscula. The skeleton is somewhat " Isodictyal" in arrangement but 

 confused. The chief point of distinction concerns the styli, which are more slender than 

 in either of the two preceding forms and ajjpear to be blunted. 



Locality. — Bermuda, West Indies. One specimen. 



J Vide supra, also Eidley, Zool. ColL H.M.S. "Alert," Brit. Mus., 1884, pp. 417, 607. 



