82 University of California Publications. [ ZooLocy 
red or iron rusty pigment widely present in the mantle, but most 
pronounced at two ends, and more abundant posteriorly than 
anteriorly. 
Body muscles four, all confined to the dorsal half, the first 
two bent toward each other and nearly touching in the mid-dorsal 
line; the last two likewise similarly inclined, sometimes connected 
by a short ridge in the mid-dorsal line, and sometimes not in 
contact. A single band in the dorsal lip and two in the ventral. 
A pair of angular bands on the dorsal side behind the branchial 
orifice, the apices directed backward, and the dorsal limb of each 
reaching well into the dorsal lp to serve as a retractor of 
it. (Dorsal lmb unfortunately omitted in Fig. 23.) <A 
short oblique band on each side, near tangential with the apex 
of these angles. A single band in each of the posterior lips, 
nearly as strong as the body muscles. Endostyle slender, 
straight except for a distinct ventral curvature just short of the 
posterior end, the posterior termination separated from the 
nucleus by the length of the pericardium. Guill relatively rather 
short, beginning but little in front of the first body muscle, which 
is unusually far back, and not reaching to the nucleus poste- 
riorly. Hypophysis large, irregularly triangular, placed vertic- 
ally, the opening anterior, suspended as a prominent tubercle 
immediately at the anterior end of the gill, and ventrad of the 
ganglion, the hypophysis and ganglion being consequently in 
unusually close relation. Nucleus subglobular, small, shghtly 
compressed dorso-ventrally, projecting but shghtly, if at all, from 
the general ventral surface of the animal, but extending back- 
ward fully even with the posterior extremity of the atrial siphon, 
its color nearly uniform seal brown. 
The aggregate generation is not rare in the area, but not a 
single zooid of the solitary generation has thus far been observed. 
The species has been taken on the California coast from Monterey 
Bay southward, and in the months of January, February, March, 
May, June, July, and August. 
Fam. IJ].—Do.uiouipAE Bronn, 1862. 
Thaliacea in which the body form is typically and perfectly 
that of a barrel; the body muscle bands are complete rings; and 
