THE STUDY OF INSECTS 



PLATE III 



Internal Anatomy of a Cockroach (Periplaneta orientalis). 



a, antennae; 6i, bi, ft,?, legs; c, anal cerci; d, ganglion on recurrent nerve upon the crop; 



e, salivary duct; /, salivary bladder; g, gizzard; h, hepatic cceca; i, mid-intestine; /, Malpig- 



hian vessels; k, small intestine; /, large intestine; m, rectum; », first abdominal ganglion; o, ovary; 

 p, sebaceous glands. (From Rolleston.) 



