I'LATE VI. 



PAGK- 



Figk 1. HOLOCYSTITES PUSTULOSUS— Side and anterior view, .... 134 



la. Summit view, siiowing ambulacral orifice, arm bases, mouth, and anal 

 aperture. M, mouth. 



Fig. 2. HOLOCYSTITES PLENTTS— View of the leftside, showing ambulacral orifice 



and arm bases, 135 



2a. Summit view, showing ambulacral orifice, arm bases, and mouth. M, 

 mouth. P, anal aperture. 



Fig. 3. HOLOCYSTITES ELEGANS— Posterior and part of a side view. The speci- 

 men, in this view, is inclined forward ; it would have been better 

 if an upright view had been presented. It shoM^s the anomalous 

 circular apertures, 13(> 



3a. Summit view, showing ambulacral orifice, arm bases, mouth, and anoma- 

 lous circular apertures. M, mouth. 

 Fig. 4. Root, or termination of a column, of a Holocystites coiled around an- 

 other column, and terminating without branching. 



Fig. 5. Cypricardites quadrangularis, 138 



Fig. 6. CUNEAMYA CURTA — Left valve, 138 



6a. Cardinal view. 

 Fig. 7. Orthodesma mickleboroughi— View of the left valve, . . .139 

 Fig. 8. Sedgewickia (?) lttnulata— Eight valve, 140 



8a. Cardinal view. 



