STRUCTURE AND DEVELOPMENT OF EMBIA TEXANA. I 1 3 



cesophageal portion, one within the prothorax, the other in the 

 mesothorax, though still lying close over the oesophagus. At 

 intervals this nerve sends off a series of fine nerves anastomosing 

 in minute knots and which terminate within the circular muscles 

 of the tract. The remaining ganglia are unpaired also, lying in the 

 median line above the alimentary tract and within the hind fork 

 of the brain. These are three in number, more or less fused, and 

 the anterior one bilobate. They send but one slender nerve back- 

 ward, above the one from the frontal ganglion, and are connected 

 with the brain by two commissures arising from the sides of the 

 anterior bilobed ganglion. As the peripheral nerves of this sys- 

 tem intimately innervate the muscles of the alimentary tract, con- 

 forming with all its irregularities, it would seem that peristalsis is 

 controlled from this source. Professor Blandford did not find the 

 posterior ganglions of the visceral system of Uhrichi. This was 

 probably due to their small size in the specimens studied rather 

 than to their complete absence. All the ganglia vary in size 

 almost more than do the other organs of the body. In some 

 cases the posterior ganglia of the visceral system are much re- 

 duced and flattened. 



The female generative organs agree with the descriptions of 

 those of Solieri and Uluiclii, consisting of a paired oviduct, each 

 branch of which emits five lateral tubules. In the larval state 

 the tubules are consolidated into a compact elliptical mass, situ- 

 ated dorsally one to each of the five basal segments of the ab- 

 domen. Each mass comprises about seven transverse chambers 

 and is connected with the slender oviduct by a short and equally 

 slender strand. In the adult the tubules lengthen by a forward 

 growth, the chambers separate and on becoming elliptical give a 

 moniliform appearance to the tubule. The end-cells remain 

 undifferentiated. In a multiparous female the oviduct becomes 

 greatly distended and its walls much wrinkled. This distension 

 is evident also at the base of the recently emptied follicles. The 

 spermatheca is large, occupying the free portion of the eighth 

 segment. It opens below by a somewhat tortuous cluct into the 

 short vagina. The end of the ventral nerve chain passes between 

 the vagina and the spermatheca. 



