PLATE LII. 



PAGE 



Semperella schultzei, Semper, . . .261 



Fig. 1. Ideal transverse section through the middle portion ; natural size. 



Fig. 2. A specimen, preserved in alcohol, with a Palythoa investment on the 

 basal tuft ; probably a young specimen ; natural size. 



Fig. 3. External part of a transverse section of the young specimen shown in fig. 

 2 (combination figure) ; x 20. The pinuli in the outer side of the 

 terminal oscular sieve-plates have been erroneously omitted. 



Fig. 4. Oxyhexact with two long echinated and four short smooth rays ; x 100. 



Fig. 5. Oxyhexact with straight echinated rays ; p< 100. 



Fig. 6. Fragment of dermal skeleton ; x 100. 



Fig. 7. Small amphidisc ; x 300. 



