ANDREWS: ANNULUS YENTRALIS. 
459 
In C. virilis the recess is at most only half a heart and as the tip of 
the trumpet tube is enlarged and wide, the recess seems doubly insig¬ 
nificant and it is easily overlooked especially since it is full of sperm 
as is likewise the tube. Dorsally, however, it extends to some depth 
and in a transverse section (pi. 47, fig. 30) across the tip of the tube 
it is represented bv a rather large pouch running up on one side of the 
tip of the tube. On the other side there is also a faint sac and the 
two together if greatly enlarged where discharging, might form such 
a recess as shown for C. affinis in figure 8 (pi. 43). The apparent 
nature of the recess as a puckering-in of the exoskeleton to make a 
pocket where the posterior end of the tube opens by a narrow slit to 
the external suture, is clearly indicated in C. virilis and this same 
interpretation may well be extended to C. affinis. 
The use of the annulus in this species is sufficiently evident from 
the fact that all the twenty-one females examined in autumn and 
winter had the annulus full of sperm. No observations were made 
upon the mode of discharge, as the specimens all died in captivity 
before laying. In only one case was sperm seen on the external sur¬ 
face, along the median suture. 
From the great length and size of the trumpet, there seems oppor¬ 
tunity for greater storage of sperm than in C. affinis, but part of this 
is not used, since the wax is run in nearly as far back morphologically 
as it is in the former species leaving about the same morphological 
extent of tube for sperm. Comparing figures 21 and 23 (pi. 46) 
with figures 5 (pi. 43) and 28 (pi. 47) we find that the sperm runs for¬ 
ward only about one arc farther in the long tube than in the short 
tube, the greater length gained by C. virilis being used largely to pack 
in more wax anteriorly. The wax often projected slightly as a plug 
at the posterior end of the fifth line when it ran along a gaping suture, 
and in other cases the plug projected from the angle where the fifth 
and sixth lines joined. In all cases the plug being deep down in the 
depressed area under the cushion, was not conspicuous as it was in 
C. affinis. 
As already indicated, the phenomenon of right and left symmetry 
was seen here as in C. affinis. Of fifteen specimens only one had the 
orifice upon the right of the animal, but of six others, three opened 
upon the right; thus the great majority of the twenty-one studied 
opened upon the left. 
Comparing a right- with a left-handed annulus (pi. 46, figs. 23 and 
