96 University of California Publications. [| ZooLoGy 
SS SL 
Fig. 29.—D. miilleri, oozooid, before degeneration of internal 
organs. 
(b) Oozooid. Fig. 29. Maximum length before beginning of 
degeneration of intestine, something less than 2 mm.; test rela- 
tively thick and soft; muscle bands nine, without distinctive 
characters as compared with same generation of other species. 
Branchial orifice with normally ten lobes; atrial with twelve, 
the former distinctly more prominent. Branchial membrane 
with its stigmata, endostyle, peripharyngeal band, ganglion, 
hypophysis, and otoecyst differing in no easily recognizable way 
from the corresponding parts in D. ehrenbergu. Intestinal tract 
U-shaped, esophageal mouth very near the center of the branchial 
membrane, whole tract in fifth intermuscular space. 
Dorsal process short and thick, with but few buds, sometimes 
having a pronounced kink near the base, but never, so far as 
observed, with the top-shaped terminal piece characteristic of 
D. ehrenbergu. 
In this, as in the other species, little of positiveness is known 
about the old ‘‘nurses.’’ Several times catches containing 
oozooids with internal organs intact have also contained several 
scenescent specimens of medium size and having the form of the 
old-style, bell-mouthed cannon shown by Keferstein und Ehlers, 
‘*Gen. 1B,’’ Pl. X, fig. 1. These I suspect belong to the present 
species. I do not imagine this pecular form to be wholly dis- 
tinective. It is probably due to contraction; but it certainly does 
not occur frequently in old nurses of what I suppose to be f77- 
tonis and ehrenbergu. 
