t * 
89 
supra-cesophageal ganglion, have a special function, which 
may be olfactory. 
THe RepropucrivE OrGaANs. 
The reproductive organs are paired, and as already 
stated, the sexes are separate. 
In the female (Plate II., fig. 4) the ovaries are large 
kidney-shaped organs lying on each side of the anterior 
portion of the stomach and extending from under the first 
pair of feet to the base of the second maxille, when 
fully matured. Each oviduct (od.) arises near the anterior 
end of the ventral surface of the ovary, and courses 
posteriorly as a narrow tube till it enters the genital 
segment. It then expands rapidly, and passes to near the 
end of the segment. It then reverses its course, passing 
forward to the central portion of the segment, where it 
turns again in a posterior direction, and passing out to the 
centre of each half of the segment, it opens to the exterior 
just under the fifth feet. Hach oviduct thus forms two 
loops in the genital segment. On the ventral aspect of 
the loops of each oviduct there is a short, semi-transparent 
eylindrical tube (sg.) with the anterior end closed and 
rounded, and the posterior produced into a fine duct, 
which communicates with the oviduct near its extremity. 
This organ is evidently a cement gland for secreting the 
enclosing membrane of the ovisac. Each yulva (fig. 6, vw.) 
is situated near the middle line behind the junction of the 
genital segment with the abdomen. It appears to consist 
of a simple opening leading into the vagina which expands 
‘ 
into a “‘receptaculum seminis.” This is an elongated sac 
passing from the median line to the oviduct, which it 
enters alongside the duct of the cement gland. 
In the male the reproductive organs (Plate II., fig. 5) 
consist of a pyriform testis, on each side, situated in a 
position corresponding with that of the ovary. It is only 
