92 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
from the hepatic vein. The branches of this vein are separated 
from the surface only by a very thin, columnar epithelium. 
Clumps of gland cells are found at the ends of the plumes just 
beneath the sinuses, and scattered mucous cells are occasionally 
seen in the epithelium. 
The arteries are large tubes with a thin, muscular wall. The 
larger sinuses have a thin homogeneous wall of connective tissue 
and, in the lateral sinuses, muscular fibres are sometimes present, 
but the smaller sinuses seem to have no wall, being merely clefts 
in the connective tissue. 
The circulatory system does not possess any striking differ- 
ences from the type found in Doris by Hancock and Embleton, 
excepting for the special arrangement for the papille, which 
were not found in any of the forms they described. 
BIBLIOGRAPHY 
Alder, J., and Hancock, A. 1910 
The British nudibranchiate Mollusca. Ray soe., Part VIII. 
Hancock, A., and Embelton, D. 1852 
On the anatomy of Doris. Phil. trans. 
Hescheler, K. 1900 
Lehrbuch der vergleichenden Anatomie der wirbellosen 
Thiere. Von A. Lang. Pt. I. Mollusca. 
MacFarland, F. M. 1905 
A preliminary account of the Doridide of Monterey Bay, 
Cal. 
Proce. biol. soe. Wash. Vol. XVIII, pp. 35-54. 
(Contribution from the Zoological Laboratory of Pomona College.) 
