118 JESSE LE ROY CONEL 



The tubules ofj the Malpighian bodies, also, are smallest 

 and shortest at the posterior ends of the duct. In one speci- 

 men the most posterior trace of a Malpighian body is a com- 

 pound tubule, the base of which opens into the duct, and the neck 

 ends blindly. The neck is 0.06 mm. long by 0.105 mm. wide, 

 and the trunk is 0.15 mm. long by 0.21 mm. wide. 



Each Malpighian body is surrounded by a compact stratified 

 connective tissue band which is arranged in concentric rings and 

 which is closely applied to the epithelium of the capsule. Out- 

 side this band of connective tissue there may be a more or less 

 loose web of connective tissue which envelopes the Malpighian 

 body and the mesonephiic duct. In one section, which shows 

 the short plain tubule opening into both the duct and the cap- 

 sule, the broad band of stratified connective tissue surrounding 

 the duct continues around the tubule and the Bowman's cap- 

 sule. Here the tubule is very short and narrow. Figure 62 

 shows the relation of these tissues when both glomerulus and 

 the basal portion of the tubule are present in the same section 

 with the duct. From this figure it will be observed that the 

 glomerulus and the distal end of the tubule are not entirely sepa- 

 rated from the mesonephric duct, but that they are bound to the 

 latter by either a band or a web of connective tissue which 

 envelopes both duct and Malpighian body. 



Myxine 



Mesonephric Ducts. The mesonephric ducts of Myxine are 

 like those of Bdellostoma in so many respects that a detailed 

 description of them would be needless repetition, hence only 

 points in which they differ will be noted. 



The ducts are longer in Myxine, of course, and are a fraction 

 of a millimeter narrower than the female ducts of Bdellostoma. 

 The ducts of the latter are gray and opaque, while those of 

 Myxine are approximately of the same color as the flesh and are 

 somewhat transparent. 



The -anterior ends of the ducts are farther removed from the 

 pronephros in Myxine, being 10 to 20 mm. posterior to it. No 



