No. 424.] THE GENUS TRYPANOSYLLIS. 303 
T. ingens, and in fact most, if not all, species of this genus, 
T. gemmipara is much flattened horizontally, being only I mm. 
in dorso-ventral diameter. The somites number about 300, and, 
as in T. ingens, their width many times exceeds their length. 
The tail buds, 50 in number, present all stages of develop- 
ment. They form a tuft arising from the ventral aspect near 
the posterior extremity, and superficially resemble a bunch of 
















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Fic. 8. — Caudal buds, ventral aspect, of T. gemmifara. The young buds are seen on the left 
of the figure. x 26. 
ferns (Figs. 7, 8). Neither as regards position nor order of 
development do they obey the laws of bilateral symmetry. 
The whole cluster is bent to the right, making an angle of 
about 25° with the longitudinal axis of the worm. Only 13 of 
the buds have reached an advanced stage of development; 
these are elliptical in shape, rather thin in proportion to their 
other dimensions, and possess the chief external characters of 
