92 JOUENAL OF ENTOMOLOGY AND ZOOLOGY 



from the hepatic vein. Tlie branches of this vein are separated 

 from the surface only by a verj' 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 epitlielium. 



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 s])ecial arrangement for the papilla^, which 

 were not found in any of the forms they described. 



BIBLIOGRAPHY 



Alder, J., and Hancock, A. 1910 



The British nudiliranchlate ilollusea. Ray soc. Part VIII. 



Hcuicock, A., and Emhdton, D. 1852 



On the anatomy of Doris. Phil, trans. 



Hescheler, K. 1900 



Lehrbuch der vergleichenden Anatomie der wirbellosen 

 Thiere. Von A. Lang. Pt. I. Mollu.sca. 



MacFaiIaiid,F.M. 1905' 



A preliminary account of the Dorididte of Monterey Bay, 

 Cal. 

 Prne. biol. soc. Wash. Vol. XVIII, pp. 35-54. 



(Contribution from the Zoological Laboratory of Pomona College.) 



