7 8 



EISEN 



Prostomium and front of the head are blunt or rounded and much 

 bent downward. The mouth is well down on the ventral side. The 

 body-wall is thin and transparent in glycerin specimens, and the inner 

 organs can be fairly well seen. There is but a slight depression be- 

 tween the somites, and the body is smooth and glossy. 



Septal glands . There 

 are septal glands in IV, 

 V and VI. The septal 

 part attached to the pos- 

 terior septum is thick and 

 not lobed, with even out- 

 line, and, seen in a longi- 

 tudinal section of the 

 body, this septal part is as 

 wide and of the same 

 "A ^$$F* r general shape as the in- 



terseptal lobe which lies 

 FIG. 45. Lumbricillus santceclara:. 



free m the middle of the 



somite. There are no salivary glands. 



The brain (fig. 44) is remarkable for its length. In the most elon- 

 gated the length is about thirty units, while the width at the center is 

 only twelve units. The posterior margin is deeply emarginated and the 

 two lobes show some slight 

 secondary lobing(fig. 44). 

 There are two lateral mus- 

 cles, and each central lobe 

 is attached by two muscu- 

 lar strands. 



Spermathecce. A con- 

 traction at the middle di- 

 vides the ampulla proper 

 from the more muscular 

 duct. Both parts of about 

 equal size and bent to- 

 ward each other in a knee- 

 like manner. The glands 



FIG. 46. Lumbrtctllus santcedara. 

 at the base in the shape of 



a thin even disc, saucer-shaped, with the concavity toward the 

 intestine. The connection with the intestine wide and reflexed. 

 The form of the spermathecae varies but slightly in the specimens 

 dissected. 



