VoL. 2] Ritter——The Pelagic Tunicata. 
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as follows: second muscle not bifurcating ; third bifureating near 
dorsal line as on opposite side, the anterior branch again bifur- 
eating to send a branch forward which anastomoses with second 
muscle, the single band thus produced passing into the ventral 
pedunele, Pl. III, fig. 8. In the asymmetry of the muscles this 
species resembles SN. rostrata, S. punctata, S. magalhanica of Ap- 
stein. The climax of the phenomenon is reached in SN. rostrata. 
First and second muscles united on each side by two longi- 
tudinal bands, Pl. III, fig. 7. In addition to the dorsal 
hp muscle given off as a branch from first body muscle, 
an angular lip muscle on each side its dorsal limb reaching 
over and becoming continuous with its mate of the other side; 
another small upper lip muscle near edge of lip. The fourth body 
muscle of dorsal side, relatively very small, bifurcating on each 
side short distance from dorsal median line, the anterior branch 
anastomosing with posterior branch of third muscle, and pos- 
terior branch passing under atrial orifice. The fourth ventral 
muscle is really the posterior branch of third dorsal muscle. 
As already stated, the ganglio-hypophyseal complex and the 
intestinal tract are clearly immature in the largest zooids seen. 
I, consequently, refrain from including a characterization of them 
in the diagnosis of the species. Certain facts about the intestinal 
tract, however, should be mentioned. In the first place, the late 
period in the life of the zooid at which it becomes complete, at 
least as compared with C. affinis, is noteworthy. In the latter 
species, the intestine has assumed its final form and_ position 
while the bud is still in the chain, and even before the whorls 
are formed. In C. bakeri, on the contrary, the way in which the 
anal end of the intestine projects freely from the posterior end 
of the body as a whole, shows clearly that the organ is not vet 
complete, even in the oldest zooids found. With little doubt the 
final form is a cirele here as in affinis. An apparently wholly 
unique feature in bakeri, however, seems to be the two appendages 
of the intestine shown in the figures. The intestinal tract as a 
whole has the form of a horseshoe, the plane of the shoe being 
approximately at right angles with the sagittal plane of the 
zooid. The entire bow projects backward beyond the posterior 
end of the endostyle and gill. The mouth of the esophagus is 
