BY R. VON LENDENFELD, PH.D. 1115 



II. SUBFAMILY POLEJN.E. Von Lendenfelcl. 

 The ciliated chambers (tubes) vertical on the exhalent canals, 

 disposed therefore radially around the canals and not equi-distant 

 from the axis of the Sponge, the chamber layer not a simple 

 cylinder but extensively folded. 



16. GENUS. POLEJNA. Von Lendenfeld. 



The spicules of the Parenchyma resemble Amphoriscus inasmuch 

 as the centripetal rays of the dermal layer lie parallel with and 

 meet the centrifugal rays of the gastral layer. Polejaelff (1) has 

 adopted Haeckel's name Leucilla for these Sponges, As the 

 meaning which he gives to it however is totally different from 

 that, which Haeckel associated with the word Leucilla, and as I 

 retain the Genus Leucilla in the true sense of Haeckel I fancy 

 myself justified in establishing this new name, which like the 

 term Pulejnse is derived from the name of the author of the 

 Challenger-Calcarea. 



30. SPECIES. POLEJNA UTER. Von Lendenfeld. 

 LEUCILLA UTER. N. Polejaeff (2. ) 



The external form of this Sponge is variable ; mostly of tubular 

 elongated form, growing narrower towards both ends, attaining a 

 length of 100 mm. and a maximum diameter of 13 mm. The walls 

 are 2 mm. thick. 



Gastric quadriradiate sjricules sagittal. All rays of the same 

 diameter, 0'02 mm. on an average, more or less sharply pointed, 

 basal ray straight, length inconstant, varying from 0*25 to 

 0*35 mm., forming with each of the lateral rays an angle of about 

 110° ; lateral rays curved outwards, reaching a length of 0"7 mm. ; 

 apical ray curved, half as long as lateral rays. Towards the 

 osculum these quadriradiate spicules grow smaller, lateral rays 

 0*3 mm. long, with a diameter of 0"0125 mm., the concave lateral 

 rays becoming straight and convex. 



(1.) N. Poltjaeff, Report on the Calcarea. The Zoologie of the Voyage 

 of H. M.S. Challenger. Part XXIV. f p. 51. 

 (2.) N. Poltjaeff. L.c, p. 53, PI. VI., figs. 2a-2f. 



