SPONGES FROM PORTUGAL. 219 



Fig. 3. Represents both subgastral and subdermal 

 triacts. (X 150.) 



Fig. 4. Dermal triact. (X 150.) 



Fig. 5. Vertical section through the upper portion of 

 one of the individuals of Amphiute paulini. o. f 

 osculum ; g.c, gastral cavity. [In this figure as 

 well in fig. 1, PL XIII., Dendy's plan has been 

 adopted to represent the collar cells diagram- 

 matically by red dots.] (X 50.) 



Plate XIII. 



Fig. 1. Portion of a transverse section through one of 

 the individuals of Amphiute paulini. dp, dermal 

 pore ; i.c, inhalant canal ; f.c, flagellated chamber; 

 e.c, exhalant canal; g.c, gastral cavity. (X 80.) 



Fig. 2. Microscleres of Physcaphora decorticans, n.g. and 

 sp. a, b, c, young stages of Selenaster ; d, adult 

 stage of the same. The somewhat eccentrically 

 placed marking in 'd' is the hilus. /, various 

 forms of spiraster ; e and g, forms of spheraster. 

 (X 500.) 



Fig. 3. Vertical section through the ectosome of 

 Physcaphora decorticans. o, osculum. 



