DISCODORIS VONIHERINGI MAC FARLAND 8l 



ones much similar to those of the terminal alveoli of the gland. 

 An examination of fig. 72 of PI. XIV may aid m a clearer per- 

 ception of the relations of the above described cavities. It 

 represents the principal ducts of the gland complex in side view, 

 as reconstructed from serial sections, the glandular alveoli and 

 other subordinate ramifications being left out for the sake of 

 clearness. The dotted line represents the contour of the gland 

 complex as seen from the front side. At the posterior end of 

 the complex the large hermaphroditic ampulla, h. amp., enters, 

 gives ofif the slender spermatic duct, sp. d., which emerges from 

 the gland as seen in fig. 74 of PI. XIV, the duct passing forward, 

 dilating into the fertilization chamber, /. ch., which makes a sharp, 

 knee like turn upward, then narrowing rapidly, gives off the 

 slender duct, x, to the albumen gland, and receives the uterine 

 duct, u. d., at the distal end of the gland complex. The duct x, 

 corresponding doubtless to the oviduct in other Dorids, passes 

 backward, and to the right, and opens into the cavity of the 

 albumen gland, /. alh., triangular in this side view, and terminating 

 posteriorly in a blind blunt prolongation. At its antero-dorsal 

 end this cavity passes into the duct connecting it with the cavity 

 of the nidamental gland, alh. d., and opening into the extreme 

 anterior end of the latter at the exit of the nidamental duct. 

 The ventrally placed large cavity, /. nid., into which the alveoli 

 of the nidamental gland pour their mucous secretion, extends 

 backward to the posterior end of the gland complex. Its dorsal 

 surface is concave, the ventral convex in the anterior half of the 

 organ, posteriorly becoming flatter, and finally the concavity is 

 shifted to the ventral side, the dorsal face being arched. From 

 the anterior end of the cavity the broad nidamental duct, n. d., 

 arises and emerges from the gland complex. In the figure the 

 space between these ducts and cavities and the bounding dotted 

 line is to be thought of as filled with the closely packed glandular 

 diverticula arising from the cavities of the nidamental and albu- 

 men glands respectively. 



The architecture of these two glands appears to be simpler 

 in this species than in most other Dorididae, From fig. 72 of PI. 

 XIV the path taken by the eggs in traversing the different ducts 

 from the hermaphroditic ampulla to the nidamental duct, 

 can be readily followed. No trace of a second duct from the 



