No» 424.] -- THE GENUS ITRYPANOSYLLIS. 309 
nerve cords run forward to the cephalized extremity and there 
innervate the eyes and a darkly staining mass of ectodermic 
cells which probably functions as brain (Fig. 14; cb)... Although 
the nerve cords are plainly separate from the epidermis, as 
shown by a cross-section (Fig. 12, #.¢.), the. brain is no more 
than a thickened portion of the epidermis, and fully confluent 
with it. As clearly shown in one section (Fig. 14), the optic 
nerve comes from the ventral cord, and not from the brain. 

“8S. 
Fic. 13. — Two pedal (mucous?) glands of bud of T. gemmifara, in longitudinal section. The 
lumens of the glands are bounded by stippled bands; the gland cells (g/.c.) are highly 
vacuolated; the epidermal cells at mouth of glands are columnar. #.#2., transversal mus- 
cles; £.s., intersegmental dissepiments ; e/., epidermis. X 525. 
When viewed from the ventral aspect the cluster of buds 
presents an interesting condition of things (Fig. 8). On the 
right, at the base of the cluster, is a group containing about 
25 very young buds (Fig. 8), as yet showing no segmen- 
tation, but each with two distal processes which are the 
Anlagen of the anal cirri. As may clearly be seen in a trans- 
verse section of the group (Fig. 9 B), the buds are arranged 
in rows, partly transverse and partly longitudinal as regards 
