262 W. HAROLD LEIGH-SHARPE 
filled by large spherical nuclei which stain very deeply with 
methyl green and other dyes. 
The posterior four or five components of the gland do not 
alternate with one another, but occupy the whole width of the 
min. 
1 2: 3. As 
Fig. 10 Raia circularis, a transverse section through the siphon (methyl- 
green-eosin). S.S., siphon sac; S.W., siphon wall; c.m., circular muscles; l.m., 
longitudinal muscles; Cl.Gl., clasper gland; P., papilla of the component gland 
on the observer’s left; Z., another component of the gland; M.B., dorsal muscle- 
bundle of the siphon. 
organ which is considerably narrowed in this region. These 
components, moreover, are devoid of papillae, and all of their 
ducts lead obliquely forward so as to emerge at the most pos- 
terior papilla, that of the sixth component from the posterior 
end of the whole organ. This is shown in a horizontal section 
(fig. 11). 
