Explanation of Plate XXVI. 



ASTROCCENIA CONICA, tt. Sp. (Mus. No. P 5946.) 



Fig. 1. A longitudinal section of type. 



Fig. 2. A transverse section of type. 

 Fig. 3. A fragment of corallum — type. 



PSEUDO-PERNA WILSONI, tt. Sp. (Mus. No. P 5945-) 



Fig. 4. Exterior view of left valve. 

 Fig. 5. Interior view of left valve. 



