BY R. VON LENDENFELD, PH.D. 325 



Plate XXXIV. 



Fig. 23. — Aulena villosa. R. v. L. Section through a portion of the sponge 

 in the interior. Osmic acid picro carniin specimen. (Cilia, coUare 

 and amoeboid wandering cells from teased specimens after life. ) 

 Magnified 900:1. (L). Lacunse of the vestibule. (P). An inhalent 

 pore. (jS'). Sieve membrane, (s). Subdermal cavity. (E). Inhalent 

 canal. (-4). Exhalent canal, (p). Chamber pores, (o). Chamber 

 oscula. (G), Ciliated chambers. {H). Horny fibre, {a). Spongo- 

 blasts. (b). Amoeboid wandering cells, (c). Elongate, spindle 

 shaped cells of a muscular and connective naturie. {d). Ectodermal 

 flat epithelium, (e). Entodermal flat epithelium. (/). Sensitive 

 cells in the thickenings at the locality where the lamella of the 

 vestibule join. (T). Palpocils. (G). Ganglia cells. 



Plate XXXV. 



Fig. 24. — Aphrodite Nardorus. E,. v. L. Longitudinal section through 

 the sponge. Half the natural size drawn from a spirit specimen 

 cut in half. (0). Pseudoscolum. (o). Oscula. (A). Exhalent 

 canals. (P). Pseudogaster. 



Fig. 25. — Aulena flabellum. R. v. L. Portion of the skeleton from a 

 specimen macerated in fresh water. 20:1. (//). Main fibres. 

 (F). Connecting fibres. 



Fig. 26. — Aulena nigra. R. v. L. Portion of the skeleton from a specimen 

 macerated in fresh water. 20:1. (H.) Main fibre. (F). Con- 

 necting fibre. 



