SOME ABNORMAL ANNELIDS. 4.59 
lation of “‘ supplementary determinants” seems necessary if we 
seek to apply here the facts worked out for the cleaving ovum 
by Driesch and by Wilson. As there the partial separation of 
cells or their affectation by various external agents may de- 
termine their action in groups to produce more or less separate 
individuals in place of one single individual, so here we may 
suppose that injuries and other external agents affect the re- 
generative tissue so that the same cells that else had formed 
one normal terminal now form two more or less separate 
ones. 
Jouns Hopkins UNIVERSITY, 
BattimmorE; December 7th, 1893. 
EXPLANATION OF PLATES 32—34, 
Illustrating Mr. E. A. Andrews’ paper, “Some Abnormal 
Annelids.””’ 
All the figures are drawn with a camera lucida excepting Fig. 1. 
Figs. 1—10 are of Allolobophora fetida. Figs. 11—16 are of 
Podarke obscura. 
Fie. 1.—Dorsal view of specimen A taken soon after death in weak alcohol. 
Fic. 2.—Dorsal view of the posterior end of A, much magnified. 
Fic. 3.—Ventral view of the same region. 
Fic. 4.—View of the longitudinal muscles of the body-wall at the region of 
union of the bud B, the tail T, and the anterior region H of this same speci- 
men; seen from the ventral aspect. Three dorsal pores are shown in the non- 
pigmented intersegmental regions. 
Fic. 5.—Somewhat diagrammatic longitudinal view obtained from sections 
of the region of union of the two terminals and the trunk, specimen A. 
Fic. 6.—Dorsal view of specimen B, 
Fic. 7.—Dorsal view of the posterior part of specimen B, much enlarged. 
