PLATE XXV. 



1. Monostyla eornnta 

 la. ,, 



16. 



2. Monostyla lunaris 

 2a, 26. 



2c. 



3. Monostyla quadridentata 



4. Monostyla bulla . 

 4a. 

 46, 



4c. ,, ,j > 



&. Monostyla Lordii 



6. Metopidia lepadella 

 6a. * 

 66. 



7. Metopidia triptera 

 la. 



76. 



8. Metopidia oxysternon 

 Sa, 



86, 



8c. 



8d. 



Be. rt 



Sh. 



. 9. Metopidia acnminata . 

 9a. 

 '96. 

 9c. 



10. Metopidia rtoomboides 

 10a. 



106. 



11. Metopidia solidns 

 llfl. 



116 ...... 



lie. 

 lid. 

 lie. 



ll/- 



12. Colurns dactylotus 

 12a. 



13. Colnrus pedatns 



dorsal view G 



side view ....... G 



transverse section ...... G 



dorsal view ....... G 



side view ....... G 



rear view ....... G 



dorsal view G 



dorsal view ....... G 



side view G 



rear view ....... G 



front of lorica G 



dorsal view ....... G 



dorsal view G 



side view ....... G 



transverse section ..... G 



dorsal view ....... G 



side view ....... G 



front view G 



ventral view ....... G 



side view G 



lorica ; ventral view G 



lorica ; dorsal view G 



transverse section . . . . . G 



head ; side view G 



trophi G 



pectoral notch of lorica ... . G 

 hind end of ventral plate, showing orifice for 



the foot G 



dorsal view ....... G 



side view ....... G 



lorica ; ventral view . . . . . G 



transverse section G 



dorsal view ....... G 



side view ....... G 



transverse section . . . . . G 



dorsal view ....... G 



ventral view, head rfitracted . . , . Gr 



side view ....... G 



rear view ..,.... G 



front of lorica . . , . , . G 



hind end df lorica, . . . . . G 



stomach G 



dorsal view ....... G 



side view ....... G 



side view ....... G 



foot and toes G 



