ON KYNOTUS CINGULATUS. 459 
enter the duct, before the latter communicates with the 
‘* bursa-propulsoria.” 
Of the female organs I have only observed the sperma- 
thece (fig. 7, spth.). These lie, as in other species, in Seg- 
ments XIII, XIV, xv (rings 23, 24, 25), opening along the 
anterior margin, though I was unable to detect the pores on 
external examination. The spermathece are somewhat pear- 
shaped sacs, variable in size and in number. In one specimen 
dissected there are, on the right side, three in a row in each of 
the above-mentioned segments; on the left side the numbers 
were one, two, and two in these segments. 
A second specimen gave the following numbers :—on the 
right side none in the segment x111, three in xiv, and two in xv; 
on the left side two sacs in each of the three segments. The 
number is evidently variable in this species. We have no 
information, of course, as to the extent of variability in the 
other species. 
There are one or two peculiarities in the structure of 
the body-wall worthy of mention. Below the epidermis is 
a layer of connective tissue, especially thick on the ventral 
surface, where it has the appearance of a homogeneous matrix, 
with spindle-shaped nuclei embedded in it (fig. 22, b¢.), which 
recalls the ‘‘ basement tissue” of Nemertines. Deeper down 
the longitudinal muscles are separated into blocks by incursive 
fibrous connective tissue, which forms a fairly thick layer in- 
ternal to the longitudinal muscles (fig. 21, ct.) A similar but 
much thicker connective tissue exists also in Brachydrilus. 
Each “ block” of muscle is made up of several bundles, 
each of which is probably derived from a single cell, as 
Vejdovsky has shown to be the case in Lumbricus. Further, 
the connective tissue between the blocks appears to pass 
through the circular layer of muscles and to terminate in 
the basement tissue (fig. 21). 
The blood-vessels in this region are very well developed, and 
enter the epidermis, between the cells of which they ramify 
(fig. 22), as in Moniligaster, Pericheta, Criodrilus, 
and other earthworms. 
