16 ARKIV FÖR ZOOLOGI. BAND 14. N:0 10. 



seeks the ricli bloocl supply of the retina as its source of 

 food. In reaching this food it burrovvs twice through the 

 walls of the eyeball, and during this burrowing the cephalo- 

 thorax develops much more rapidly than the trunk and be- 

 comes three times the length of the latter and half as wide 

 again. 



At first the trunk does not protrude much beyond the 

 outer surface of the eye and the whole copepod is straight. 

 As soon as the trunk does protrude from the surface of the 

 eye the friction of the water bends it över backwards, and 

 it finally comes to stånd at right angles to the axis of the 

 cephalothorax. Further growth of the trunk through the 

 maturing of the reproductive organs pushes its anterior end 

 beyond the base of the neck. Sometimes during this ben- 

 ding and twisting the neck gets pushed to one side of th© 

 midline, and the bilateral symmetry is then destroyed. 



Antheacheres diiebenii M. Särs. 



Äntheacheres duebenii M. Särs, Nyt Magazin fur Natur- 

 videnskaberne, vol. 17, part 2, 1870, p. 145; pl. 9, fig. 24—34; 

 pL 10, fig. 35—53. 



Host and record of specimens. A single undeveloped 

 female, only nine millimeters in length, was obtained from 

 the actinian, Halcurias carlgreni, at the Goto Islands, 

 Kiushiu, Japan, May 15, 1914; depth: 90 fathoms. This 

 corresponds with the young female figured by Särs in the 

 reference given above. 



