PLATE XIX. 



PAGE 



Malacosaccus unguiculatus, F. E. S., . . . 93 



Fig. 1. Somewhat injured specimen of Malacosaccus ungxiiculatus, F. E. S., 

 preserved in alcohol ; natural size. 



Fig. 2. Section at right angles through the lateral wall (combination figure) ; 

 x35. 



Fig. 3. Discohexaster from the trabecular framework ; x 300. 



Fig. 4. Hypodermal hexact from the dermal skeleton ; x 100. 



Fig. 5. Fragment of a floricome ; x 450. 



Fig. 6. Floricome ; x 300. 



Fig. 7. Oxyhexaster ; x 300. 



