72 University of California Publications. | ZOOLOGY 
projection of the intestinal mass and the atrial siphon. Remain- 
ing in the aggregated condition and firmly united at least until 
7 em. long, and while thus united, body somewhat asymmetrical 
from the mode of aggregation, the branchial and atrial orifices 
being turned respectively to the right or left, depending on 
whether the zooid be right or left in the chain. Largest zooid 
seen, 14 em. Test rather thick and stiff, particularly on ventral 
side, and most of all over nucleus, where in old zooids it becomes 
opalescent. Surface in some, though not in all, beset with low, 
broad, scattered processes, these on the whole more pronounced 
on dorsum. An irregular area of yellowish green in the test 
over the nucleus, and occasional small patches of this on dorsum. 
Lips of branchial orifice prominent, of nearly equal height, the 
dorsal overarching; ventral projecting forward and below in a 
blunt prow. Atrial siphon narrow, thin walled, elongated, with- 
out lips. Body muscle bands five, limited to the dorsal side, and 
not extending more than half way down to the mid-ventral line. 
The first three drawing together, but not touching on the dorsum, 
and each interrupted by a narrow interval in the mid-dorsal line. 
These three muscles, and frequently the fourth, interrupted on 
the side toward the axis of the chain, but usually not on the other 
side. Fifth muscle forked on each side. A single strong band 
in the dorsal lip, widely interrupted on both sides of the middle, 
two bands in the ventral lip, the dorsal and ventral lp bands 
crossing and intermingling in a complex but somewhat variable 
way at the angles of the orifice. Two short longitudinal bands 
in dorsal lip. Numerous delicate bands in atrial siphon, all 
confluent with a longitudinal bantl on each side. Endostyle 
slender, nearly straight, reaching back entirely to the nucleus. 
Gill relatively short, scarcely reaching into the anterior third of 
the animal; hypophysis small, hardly recognizable without dis- 
section. Nucleus relatively large, compact, ovate, regular; rectum 
far back, projecting dorsad several millimeters above the gen- 
eral level of the nucleus, greenish brown at its anterior end, 
yellow posteriorly, with an irregular scarlet area on its dorsal 
side and extending somewhat on to the gill. Embryos normally 
four, situated dorsally to the right of the median line, between 
the fourth and fifth body muscles. 
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