ORISMOLOGY. 323 



back.-~Ex. Phalanghim. PLATE XXVI. FIG. 



43. h. 

 2. COMPOUND (Compositi). Eyes which consist of an 



aggregate of hexagonal lenses. Ex. AH the 



Winged Orders. PLATE XIII. FIG. 10. and XXVI. 



FIG. 3842 h. 

 a. SESSILE (Sessiles). Eyes that do not sit upon a 



footstalk. Ex. Most insects. PLATE XXVI. 



FIG. 40, 41. 



a. SUPERIOR (Superiores). When they are placed in 



the upper part of the head. Ex. Libettulina. 



(3. LATERAL (Laterales}. When they are placed in 

 the side of the head. Ex. Apis. 



y. INFERIOR (Inferiores). When they are placed in 

 the lower side of the head. Ex. The lower pair in 

 Gyrinus. 



8. POSTERIOR (Posterior es). When placed in the pos- 

 terior part of the head. Ex. Locusta. 



s. ANTERIOR (A?iteriores). When placed in the ante- 

 rior part of the head. Ex. Crabro, Goerius olens, 

 &c. 



?. MEDIAL (Medii). When placed in the middle part 

 of the head. Ex. Harpalus, &c. 



>j. BELTING (Cingentes). When the eyes nearly meet 

 both above and below the head, so as to form a 

 kind of belt round it. Ex. Culex pipiens, Cordylia 

 Palmarum. 



0. IMMERSED (Immersi). When they are quite im- 

 bedded in the head. Ex. The Melasoma or Dark- 

 ling beetles. 



*. PROMINENT (Prominuli). When they stand out 

 from the head. Ex. Cicindela. 



b. COLUMNAR (Columnares). When they sit upon a 



Y2 



