950 



MK. H. R. MEHRA ON TWO NEW INDIAN 



setal sac is continued below as a tube to open externally, and 

 is tbere lined by cells which have the same structure as those of 

 the epidermis at the opening, out of which thepenial setae project. 

 A very obvious feature in the constitution of the penial setal 

 sac is the presence of several conspicuous lobules of a glandular 

 mass, which lie outside it in the body-cavity though connected 

 with its wall (text-figs. 2 A & B and text-fig.- 3 & PI. I. 

 fig. 2). The lobules vary in diameter genei-ally, and each is 

 continued at its narrow inner end into the wall of the setal 

 sac. The various lobules are separated from one another by a 

 few narrow bands of muscle fibres. The epithelial wall of the 



Text-fis'ure 3. 



Vertical section through tlie penial setal sac of a specimen in a more advanced 

 stage of maturity. The glandular masses here are much bigger and lobed. 

 The secretion of the gland cells is seen passing into the epithelial wall of the 

 setal sac. X 220. 



setal sac, as has been pointed out, does not show any cell out- 

 lines for the greater part (text-fig- 3), and this is specially the 

 case where the lobules pass into it, but is filled with a coagulura, 

 which is as a matter of fact the secretion. It seems to me that 

 the secretion of the gland cells which constitute the various 

 lobular masses passes into the epithelial cells and is thus stored 

 up there ; it is also likely that the epithelial cells are capable of 

 secreting too. Each penial seta is rooted only in the innermost 

 portion of the wall of the sac. The whole structure and appear- 

 ance of the glandular masses and their connection with the 

 epithelium of the setal sac resembles a somewhat similar condition 



