48 DR J. STEPHENSON ON 
bundle may be mentioned. In the genus Hnchytreus the setee of a bundle are, as is 
well known, of equal length. 
Summing up, it may be stated, that while setz of the typical Hnchytreus type 
occur in the anterior part of the body, those of the posterior segments usually, and 
even some of those in the anterior segments occasionally, show a faint double curvature 
of the type found in the genus Lumbricallus. 
The calomic corpuscles are grey by transmitted light, flat, oval, or pear-shaped, and 
granular, with a distinct, clear nucleus. As seen in sections they are mostly °025 to ‘032 
mm. in their long diameter. 
The septa are thick and muscular, in accordance with the general build of the 
Fie, 7.—a, distal ends, obliquely truncated, of two sete of a posterior bundle of a specimen of the same, 
b, two sete of a posterior segment of a specimen of the same, showing double curvature ; the 
more strongly curved ends are the proximal, The sete are swollen owing to the action of 
strong caustic potash solution. 
c, seta from segment viii, of a specimen of the sume, showing slight double curvature ; swollen 
by the action of caustic potash. 
animal. It may be added that the retractor muscles of the pharynx are also very 
bulky, and that the muscular coat of the cesophagus is very well marked. 
The alimentary canal begins to be covered with chloragogen cells in segment iv. ; 
these cells become more numerous behind the septal glands, after which point the 
canal has a dark green colour. The cesophagus widens a little in segment vu, but 
there is no marked dilatation at any part of the tube. There are no peptonephridia. 
Septal glands occur in segments iv., v., and vi. ; the last two pairs are bulky, especially 
those of segment vi., which bulge backwards beyond the setze of segment vii. 
The dorsal vessel begins in segment xiii., and the blood is red. 
The nephridia are solid masses, with a very small anteseptal portion. The organs 
are elongated, ovoid, narrow and compressed laterally, the duct leading downwards 
from near the posterior end. 
The cerebral ganglion is comparatively small for the size of the worm, squarish in 
