No. 424. ] THE GENUS TRYPANOSYLLIS. 307 
diverticula do not continue. The diverticula of this portion of 
the alimentary canal are very shallow, and were not detected in 
the entire specimen (Fig. 7). 
The attachment of the buds to the proliferating area (invisi- 
ble in the entire specimen) is by a short unsegmented pedicle 
at the cephalic extremity of each bud (Figs. 9, 9 A, 17, 7). 
There is no distinct prostomium. The 
head is merely the eye- and brain- Lm 
bearing first segment, which shows its = 
primitive character by also carrying 
parapodia equipped with dorsal cirrus, 
setz, and acicule (Fig. 9, d.c.'). This 
fact is significant, because it is exactly 
what we find in the stolons of not a 
few syllidians, among others those of ‘3)) 
Trypanosyllis krohnis ES 
The eyes, apparently only two ‘© 
(although each may represent two, | 
completely fused), are large and highly \ vw 
developed, as is often the case in Fic. 11.— Frontal section at a lower 
stolons. There is a well-defined lens tie ep rcd 
(Fig. 15, 4), a “vitreous body” (v) dinal muscle (Ln, and parapodial 
$ glands (g/.). x 75 
composed of the rods of the retinal 
cells, and a very thick, cup-shaped retina, the inner layer of 
which contains a small quantity of brown pigment (7.), but not 
dense enough to conceal its structure. . 
The buds are destitute of an alimentary canal, unless the 
merest rudiment exists in the form of a median strand (Figs. 
10, 12, s.). Certainly there is no tubular structure such as 
occurs in the bud of 7. ingens. There is no mouth, anus, or 
blood vessels. The zooid is sharply divided by the dissepi- 
ments and an incomplete median partition into a double series 
of coelomic spaces. That the right-and-left coelomic chambers 
of the same somite are sometimes continuous is clearly shown 
by the sperm masses in the more posterior segments repre- 
sented in Fig. 10. This seems to be the case only in the ven- 
tral portion of the chamber. The sperm masses do not 
- 1 See Malaquin, of. cit., Pl. X, Figs. 18, 19. 
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