Coxal glands of the Arachnids. 281 



Fig. 50. PeripaUis nicaraguensit<. Sagittal. 250:1. 



Salivary gland showing the saccule (S), the collecting tubule 

 {CT) leading into the diverticulum {DSL) of the labyrinth 

 sac. The diverticulum opens into the main part of the labyrinth 

 sac a little further back. (See photograph 51.) The lining cells 

 of the diverticulum are filled with coarse basophil granules (Com- 

 pare with those of photo 47b) and in the labyrinth sac itself 

 {SL) the nuclei lie at the base of the tall columnar cells con- 

 taining globules of secretion, but the lumen of the sac is free 

 from secretion and the cells are intact. Compare with photo- 

 graph 37 of Paragakodes. {CLE) is a part of the reservoir 

 which runs posteriorly as far as the third leg. 



Plate 41. 



Fig. 50a. Peripatus jamaicensis. Adult. Sagittal. 250 : 1. 



Salivary gland. The specimen had simply been preserved in 

 forraol so that the tissues are somewhat swollen and distorted, 

 but the relations of the various parts can be clearly seen and 

 compared with 50 and 48. 



The dark mass {SIG) is the slime gland of the oral papilla filled 

 with mucinous secretion. 



Fig. 50b. Peripatus nicaraguensis. Embryo. Sagittal. 250:1. 



Salivary gland of developing embryo in the uterus of the 

 specimen photograph 50. {SIG) is the slime gland. 



Diagram F may be consulted in connection with photographs 

 50 to 50b. 



Plate 42. 



Fig. 51. Peripatus nicaraguensis. Adult. Sagittal. 100:1. 



Salivary gland showing the passage of the diverticulum {DSL) 

 into the main body of the labyrinth sac of the salivai-y gland {SL). 

 Taken from the same specimen as photograph 50 a few sections 

 further on. The basophil granules of the diverticulum suddenly 

 cease where it enters the main sac. Along the dorsal margin of 

 the main eac the secretion appears to be beginning to pour out 

 into the lumen. 

 Fig. 52. Peripatus juliformis. Adult. Sagittal. 100 : 1. 



Salivary gland. Labyrinth sac in sagittal section to show the 

 incipient pouching and the lumen filled with products of secretion. 



Compare with photograph 37a of Paragaieodes. 



Plate 43. 



Fig. 53. Peripatus juliformis. Adult. Transverse. 250:1. 



Salivary gland. Change from the secretory labyrinth sac {SL) 

 to the striated part of the gland. At {CLP) is the lieginuing 

 of the reservoir. {CL) runs anteriorly to the outlet. 



19* 



