_ 
degeneration of intestinal tract. Form variable, from strongly 
bulged in middle region to relatively narrow here. Muscle bands 
nine, first and ninth so much smaller than the others, both as to 
size of muscle and diameter of ring, and so near the adjacent 
muscle as to be easily overlooked. Branechial orifice with from 
eight to ten moderate lobes of unequal size; atrial with usually 
twelve lobes. Endostyle rather thick, extending from near the 
second muscle to the fifth. Stigmata eight, large, in two sets 
of two pairs each, one set dorsad of esophageal mouth, the other 
ventrad; dorsal stigmata between sixth and seventh bands, ven- 
tral opposite fifth. Esophageal mouth large, with thick lips; 
situated near center of posterior end of the pharynx, in the 
space between the fifth and sixth muscle bands. Stomach glob- 
ular, situated under and extending in front of the sixth muscle 
band. Intestine rather long, extending back nearly to eighth 
muscle; slightly curved, the convex side turned ventrad. Gan- 
glion large, between fourth and fifth muscles; hypophyseal duct 
running forward, its mouth between third and fourth muscles. 
Otolith sae on left dorsal side in third intermuscular space. 
Dorsal process before beginning of degeneration of internal or- 
gans generally short, with a constriction which sets off a top- 
shaped terminal portion. Proliferous stolon, without distinctive 
4 
pals fe 
Fig. 28.—D. ehrenbergii, oozooid, after complete degeneration 
of internal organs. 
The degeneration of the viscera appears to be inaugurated 
relatively considerably later in this oozooid than in that of tri- 
tonis and milleri, and this accounts for the fact that while t77- 
tonis oozooids are much more abundant than those of the present 
species, one finds fewer by considerable of them with the organs 
still intact than he does of the gegenbaurti zooids in the same 
92 University of California Publications. | ZOOLOGY | 
