PLATE XCII. 



PAGE 



Figs. 1-8. Cyrtaulon solutus, F. E. S., . . . 833 



Fig. 1. A dried specimen in the tubular cavity of a piece of limestone; natural 

 .size. 



Fig. 2. Transverse section of a broad Hat beam of the body, showing the 

 dictyonal framework and the loose spicules in their natural position ; 

 x50. 



Fig. 3. Small nncinatum ; x 450. 



Fig. 4. Hexaster-like spicule with n long stalk ; x 300. 



Fig. 5. Dermal scopula with four strong, liarbed, unknobbed prongs ; x 300. 



Fig. 6. Dermal scopula witli six small, slight, knol>bed prougs ; x 300. 



Fig. 7. Gastral scopula with four strong, barbed, unknobbed prongs ; x 300. 



Fig. 8. Uncinatum; x 100. 



Fig. 9. Cyrtcmlon sigsbeei, (J. Schmidt, . . 333 



Fig. 9. Macerated fragment, from a photograph ; natural size. 



The old generic name Volvulina, 0. Schmidt, which was applied to a Gastropod 

 in 1865, was erroneously retained on the I'late. 



