492 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
the first order there are normally two infundibula except in the ventral 
part of the sac (on the seventh fold or sometimes also the sixth or 
sixth and fifth) where there are four. Transverse vessels of a third 
order are developed on the folds having additional infundibula. 
Generally the infundibula fork at the summit into two more or less 
perfectly separated cones, an anterior and a posterior one, or at least 
the stigmata at their summit form an anterior and a posterior spiral, 
indicating a tendency to such forking. 
Stigmata mostly quite long, and wide in proportion to the distance 
between the folds. Between the folds their direction is mainly longi- 
tudinal, though scarcely any of them are straight, and strongly curved 
or hooked forms occur here and there. On the infundibula they 
assume a concentric arrangement, and as the apex is approached they 
become ordered in more or less perfect spirals, as already mentioned, 
becoming here much narrower and closer together than on the spaces 
between the folds. Ventral to the last fold the stigmata may form a 
few incipient and rudimentary spirals. For a more perfect under- 
standing of these details the reader is referred to text-fig. 11 which 
represents a part of the sac of a rather large individual. 
The cardiac portion of the stomach has several large shallow sac- 
like expansions whose walls are thrown into numerous deep glandular 
folds mainly longitudinal in direction, or approximately so, forming 
a secreting organ of considerable extent. The pyloric portion is 
smooth-walled and tapers gradually off into the intestine. The latter 
forms a loop whose course is mainly horizontal, the reflected part of 
the loop being, however, somewhat turned up toward the dorsal side 
of the body. The branches of the loop are separated for some dis- 
tance from the end. The anal orifice has a smooth, thickened margin, 
and is often more or less distinctly two-lipped. 
Kidney large, sausage-shaped and nearly straight. It occupies a 
posterior ventral position on the right side. 
Left gonad dorsal to the horizontal part of the intestinal loop; 
right gonad just dorsal to the kidney. They differ in form, the left 
having the ovary, which is elongated, bent in an S-shaped curve, the 
right having the ovary much straighter. In each case the ovary is 
prolonged at the posterior end into a rather long oviduct, which bends 
dorsally. Its walls are very delicate. It is apparently accompanied 
by the sperm duct, a tube of much smaller diameter but thicker-walled ; 
this appears to terminate in a narrowed orifice with a thickened border 
