ALIMENTAKY TRACTS AND ADJACENT GLANDS 99 



occurs in two portions that are not joined by an isthmus. 

 Lying one on either side of the trachea, they are small and 

 inconspicuous and must be sought. In Teonoma, however, 

 the gland is better developed, the lobes large, and the isth- 

 mus is almost as extensive antero-posteriorly as the lobes, 

 although thinner. It is finely besprinkled with minute, 

 black spots. 



Thymus gland. This varies somewhat in size with age, 

 as usual, but is comparatively large in the present genus, 

 with the two lobes distinct. In a subadult though sexually 

 mature female, each lobe measured 13 mm. in length. 

 In a fully adult Teonoma it was the same size. 



