246 University of California Publications. [ ZooLocy 
the ventral side of the zocecium below the operculum but exterior 
to the aperture, and contains an ovum in the early cleavage 
stage (@.). In all cases in which the ocecium is present the 
tubular part of the zocecium is distinctly curved, as shown in 
fig. 4, as if affording protection to the delicate ocecium and its 
contents. This is the first instance, so far as known, of the de- 
lineation of the occium of Aetea anguina; Waters has figured 
the owcium of the so-called variety recta in which it is on the 
dorsal side of the erect portion. The difference of location of 
the ocecia in these two forms is probably sufficient to separate 
them into distinct species. 
There is a possibility that the species found here is an un- 
described one peculiar to this coast, but the owcium of Aetea 
anguina not having been hitherto known, and no other distine- 
tions being apparent between our form and that found in for- 
eign localities, this identification must stand for the present. 
The distribution of Aetea anguina is world wide, and this fact 
adds to the probability that we have here the older well known 
form. 
This species is abundant at San Pedro and San Diego, grow- 
ing over kelp, hydroid stems, shells, and other bryozoa. 
2. Aetea truncata (Landsborough) Busk. 
Pen tissi to, 6: 
Anguinaria truncata Landsborough, 1852, p. 228, Pl. XVI, figs. 
57, 57*. 
Salpigia Hassall Coppin, 1848, p. 273, Pl. X, fig. 3. 
Aetea truncata, Busk, 1852, p. 31. 
Aetea truncata, Smitt, 1865, Pl. II, figs. 5-14; Pl. ILI, figs. 1-8. 
Aetea truncata, Smitt, 1867, 279 and 295, Pl. XVI, fig. 1. 
Aetea truncata, Hincks, 1880, p. 8, Pl. I, figs. 8-11; Pl. II, fig. 3. 
Zoarium growing irregularly over the substratum. Zowcia 
rather widely separated, the posterior creeping portion fre- 
quently lengthening into a long slender fiber (Pl. IV, fig. 5 
ad.) ; the tubular erect portion varying in length (tw.), the 
membranous aperture (ap.) occupying on an average a little 
more than one-third of its length; slightly wider at the top 
