1894.] 



MICROSCOPICAL JOURNAL. 



117 



Two horns or a bunch. 

 No horn. 



Abdomen ovate or inversely conical. 



Mouth more or less constricted. 

 One horn. 

 Two or a bunch. 

 No horn. 



MOUTH CLOSED. 



Horn. 

 No horn. 



Lophocyrtis. 

 Tricolocafnjie. 



Theocorys. 

 Lophocorys. 

 Theocarnpe, 



Theocapsa. 

 Tricolocapsa. 



SECTION D. FOUR TO SEVEN OR MORE JOINTS IN 



SHELL. 



36.— Family: PODOCAMPIDA. Three radial apophy- 

 ses. 



MOUTH OPEN. 

 Wings solid. Stichopilium. 



Wings latticed. Pteropilium. 



MOUTH CLOSED. 



Three solid ribs. Cephalis with apical horn. Artopera. 



37.— Family: PHORMOCAMPIDA. Numerous radial 

 apophyses. 



