PLATE XLIX. 



PAGE 



Fig. 1. Baspailia tenuis, transverse section of axis (a) and tissues immediately 

 surrounding it; g., granular cells, seen in transverse section; c, 

 globular cells of unknown function ; x 190, . . . xxii 



Fig. la. Portion of longitudinal section in the same region ; a., axis ; r/., granular cells 

 seen in longitudinal section ; x 190. 



Fig. 2. AxineUa (f) paradoxa, portion of section of choanosome ; i.e., inhalent 



channels ; y^c, flagellated chambers; e.c, exhalent channels ; m.c, 



mesodermal cells ; x 290, .... xxii, xlvi 



Fig. 2a. Portion of a band of elongated mesodermal cells (;/.) found accompanying a 

 skeleton fibre ; x 290. 



Fig. 3. Phakellia ventilahrum, var. connexiva, section through a frond, taken at 

 right angles to the surface; o., oscula; d.m., dermal membrane; 

 p., pores; i.e., large inhalent canals, or subdermal cavities; e.c, 

 exhalent canals ; f.c., flagellated chambers ; x 18, xxx, xli, xliii, xlv 



Fig. 4. Cladorhiza (f) tridentata, radial, vertical section through one of the 

 marginal, globular bodies ig.h.); gl., glandular organs ; s., jelly-like 

 secretion (?); c/l, choanosome ; x 44, .... xxxiv 



Fig. 4a. Small portion of section through the interior of a globular body, showing the 

 irregularly shaped cells {c), lying in the jelly-like matrix ; x 284. 



Fig. 4/). Section through one of the cup-shaped, glandular organs ; g.c, the individual 

 cells (or nuclei of the cells) of which it is composed ; x 284. 



The spieulea are 'printed in blue. 



