6i8 L. H. GOUGH. 



there that traces of them are found. With the drying up of 

 the wall cells their plasma has been withdrawn from the 

 interior of the wart-like processes of the cuticle. 



In the fourth stage the outer cavity of the lateral organ 

 was filled with very small yolk particles ; these have now 

 conglomerated and form a solid mass, staining deep red with 

 eosin. The partition that had begun to form between the 

 base of the lateral organ and the base of the fourth ex- 

 tremity is now complete. 



A remarkable fact is that a substance resembling the 

 filling of the lateral oi'gan is to be found in the adjacent 

 parts of the base of the fourth extremity. 



The shreds of dark substance covering the lateral organ in 

 the fourth stage have become much thicker (they have been 

 removed in the drawing [fig. la], so as not to hide the 

 lateral organ). This makes it appear more probable that 

 they have been secreted by the lateral organ. 



4. The Coxal Gland. — At this stage the coxal gland is 

 at the height of its development. Only the gland belonging 

 to the third extremity is still to be found. It occupies all 

 the space between the cerebral ganglia and the ventral gan- 

 glion-cord that is not occupied by the muscle-stomach. 

 Bulging over the sides of the ventral ganglion-cord, it now 

 lies in at least four segments, namely, the third, fourth, fifth, 

 and sixth, its opening lying at the base of the third extremity. 



There are two different parts of the gland which can be 

 distinguished, namely, the mouth end and the gland proper. 

 The mouth end is composed of cells in every way resembling 

 those that form the epidermis. Its nuclei are oblong, and 

 stain deeply with h^ematoxylin. In this part I observed no 

 trace of cell-walls. The second part builds up the chief 

 bulk of the gland itself. It consists of an unbranched tube, 

 much convolved at its inner end. The tube runs nearly 

 straight from the surface up to near the brain; next it bends 

 backwards and runs in almost a straight line till it reaches 

 the sixth segment; then it begins to twist and turn so 

 much that it is impossible to follow it further. As I have 



