ORGANS FOR SPERM-TRANSFER 253 
Sections 8 and 9 show the orifice passing into the groove; they are 
cut obliquely transverse and, in addition to the section of the first 
stylet, show also the section of the second stylet as it lies locked in 
the first. Disregarding for the present all but the lower part of 
the sections we see that the stylet has widened out from the con- 
stricted neck into a wide flattened mass sub-divisible with refer- 
ence to the groove into the external and median masses. In 
Fig.7 Section across the stylet, in the region of the neck, just below the orifice, 
on the level 7 of fig. 6. R—the sharp ridge on the external mass, fig. 6 and 1. 
2. 90mm. A. 
Fig. 8 Cross section of the same at the level 8, showing the groove above the 
orifice filled by the head of the accessory stylet, which is the separate.mass lying 
to the left and above. 2. 90 mm. A. 
fig. 8 the orifice is so overhung by the lip as to be in section a C- 
shaped bay, embracing the head and neck of part of the second 
stylet. Here again the shell is remarkably thick, but is penetra- 
ted by the ducts of the glands discharging on the surface that lines 
the orifice. In fig. 8 the lower straight side to the left is the flat 
face that is normally applied against its fellow on the outer side 
of the body. Above is the angle (R) that represents the ridge of 
