SOME ABNORMAL ANNELIDS. 441 
well as posterior to this left lateral outgrowth, while this itself 
seems normal in the character of its rings. Thus the somite 
99 is a single ring while 89 is split on the left side, or forms as 
it were a ring the ends of which somewhat overlap one another. 
91 and 92 as counted on the right are continuous by a spiral 
of one turn. Thus, as may be easily seen in a model con- 
structed from the above figures, the anterior part of 91 isa 
complete ring that is continued from its middle dorsal part as 
a spiral passing to the left, down, and across the ventral side, to 
come up again into the dorsal side on the right ; here it forms 
the anterior part of 92 and is continuous with the complete 
ring that the posterior part of 92 forms. 
The dorsal pore seems to be lacking at the beginning of this 
spiral, where 910 leaves 91 a, but it is present at the other end 
where 92a joins 92. The spiral may be designated 915 + 92a. 
The next rings, 93 and 94, are complete and single. 
The lateral process springs from the left of a complex spiral 
beginning in 95. Here again a clay model or a glass tube or 
bottle with the intermetameric groove marked upon it will make 
clear the actual state of things represented in figs. 7 and 8. 
The anterior part of 95, 95a, isa complete ring whence a spiral, 
950, runs over toward the right and so around across the ventral 
side, in a direction opposite to that of the spiral 91—92. This 
spiral 955 comes up on the left as 96 and so across and down 
to end on the ventral side in a complete ring, 97, fig. 8. This 
spiral thus makes one and a half complete turns from the ring 
95a to the ring 97, 
Certain complications must next be considered. The ring 
95a is subdivided ventrally by a faint groove, seen only in 
fig. 8, into two half rings 95a! and 95a? corresponding to 
the single ring 95a as seen on the dorsal side. Again, the 
region on the left whence springs the lateral terminal is an 
elongated elliptical expansion of the union of 95a and 950, as seen 
from the left side. This enlarged lateral region ends ventrally, 
fig. 8,in a sharp angle between the divaricated 95a and 95d ; 
the enlarged region crowds the halves of 95a (95a'and 95a?) in 
front of it and crowds behind it the ring 95 0, where continued 
