WORMS 
123 
pula ; a number of forms of worm-tubes, showing their great variety 
and beauty (see especially the delicate Filograna), are to be seen in 
the small Table-cases placed against the north wall of the Gallery. 
Fig. 19. 
Home of Panthalis oerstedi. 
Attention should be especially directed to Mr.' A. T. Watson's 
beautiful preparations of TerebeUa Uttoralis. We give a figure (Fig. 19) 
Fig. 20. 
Tl.C. 
Section across the body of an earth-worm to show the disposition of the more 
important organs ; the body wall (w) consists of dermis, circular, and longitu- 
dinal muscles ; the body cavity is divided by membranes (c) into a series of 
chambers, in each of which opens the mouth of a coiled nephridium in). [The 
axis of the cavity is occupied by the intestine {%) ; above and below it is a 
longer blood-vessel (v), and below it is also the central nerve-cord (nc). 
after a drawing by that gentleman of the home of Panthalis oerstedi, 
the tube-forming habits of which have been carefully observed by him. 
