250 E. A. ANDREWS 
mm. wide and 5 long, and is smooth except for a roughened area 
near its proximal end where there is a long tuft of finely plumose 
setae which bend abruptly downward, that is, posteriorly, as if 
an adjustment to the fact that they are pressed in between the 
two stylets. These setae are so long as to be visible from all 
points of view, cf. figs. I, 11, III, Iv. 
The groove itself is seen only from the median and ventral 
views. Itissome 7mm. long and begins as the orifice on the med- 
ian face where it meets the ventral, fig. 11. The orifice is a con- 
ical opening bounded by that depression of theneck that makes the 
notch so conspicuous in fig. 111, by the rounded origin of the me- 
dian mass, fig. 11, and by the overhanging lip of the external mass. 
It is of such shape that the tip of the spout, fig. 1, can fit into it. 
The groove leads from the orifice obliquely outward and distally 
between the external and median masses some 3 mm. and then 
turns to make a rounded angle, fig. 1, toward the median line 
some 3mm. more. In this part of its course it is soon concealed 
behind the median mass that is rising to form the base of the spat- 
ula, but it still exists there and emerging again runs the entire 
length of the spatula as a very narrow slit with horny edges. 
The groove is thus a long double curve, bending abruptly outward, 
then forward and slightly inward and finally outward again, as 
seen from the ventral side. But it also bends in the vertical plane, 
passing downward, then forward and upward and finally a little 
downward at the tip. While the walls of the groove seem to be 
merely hard rounded bone there projects into the groove from the 
side a narrow shelf of horn that springs from the external mass 
only. This will be seen in sections. 
The spatula is a flat flagellum-like process some 2 mm. long, 3 
wide and perhaps } to io thick. It is curved and pointed as seen 
in the figures. It springs from the median mass where this sud- 
denly narrows to help form the canula, fig. 11. In life the spatula 
is milky white and pliable, not bony, more like leather. At its 
base it passes suddenly into the bony walls of the median mass 
and there can be bent as if in a socket. After drying it looks 
more like a thin chitinous membrane over a dried contents. It 
is somewhat concave at the base on the dorsal face. With methyl 
