33G Effa Funk Miihsc. 



erned largely by the size and number of glands of the inner battery. 

 Authors have given to these glands in the toad, and to corresponding 

 glands in other Batrachians, the name of large, contractile, granular 

 or poison glands. 



(2) Among or just beneath the pigment cells are found small 

 glands, whose bodies lie wholly in the outer loose cutis, and which 

 make up the outer battery of glands (Figs. 12, 14, 23, 25-c, 58-c). 

 The bodies of these glands never reach a deeper level than the collars 

 of the glands of the inner battery. A lumen is present which is lined 

 by a definite epithelium (Figs. 28-35). These have in general been 

 called small, non-contractile, or mucus glands. 



(3) Those glands which show an intermediate condition, both as 

 regards the structure and the location, comprise the transitional bat- 

 tery (Figs. 23, 25-b, 36-41). Such glands are not always present 

 where those of the inner and outer batteries occur. It is probable 

 that when these glands have occurred, most authors have classed 

 them with the mucus, small or non-contractile. In a few instances 

 a separate category has been established to include these glands. 



I am convinced that the glands of these three batteries are all 

 different stages in the life history of one kind of cutaneous gland. 



The Mature Gland. 

 Mature glands occur in the skin of the various parts of the body. 

 They reach their highest development and largest size in the central 

 areas of the parotids of the adult toad (Fig. 14). The following de- 

 scription of the mature type applies definitely to those occurring in 

 the above region. A median longitudinal section of such a gland 

 shows that it is relatively an enormous sac-like body with a short, 

 thick outlet which consists of a neck and collar (Figs. 14, 25-a, 42, 

 58-a). The neck is in connection with the epidermis and the collar 

 is a great accumulation of cells that marks the transition from the 

 neck into the body of the gland (Figs. Y8, 79). A duct leads from 

 the cavity of the sac, the lumen, through the neck and collar to the 

 surface. The most conspicuous feature of this type of gland is the 

 gi'eat quantity of granular secretion, which completely fills its lumen. 

 In the central areas of the parotids, the vertical diameter of these 



