PLATE II. 
Figs. l- 3 .—S 2 nrida {australis% female (“ Blake ” specimen). 
Fig. 1. — Ventral view. 
Fig. 2. — Lateral left view. 
Fig. 3. — Terminal (aboral) view. 
Letters as in PI. the papillae for the opening of the kidneys; cr., inner 
hand of chromatophores ; I., infundibulum ; liJa., lateral pallial apophyses. 
Figs. 4-7 . — Spirula peronii, structure of the shell. 
Fig. 4. — A septum, in face. 
Pig^ 5, A longitudinal median section from near the anterior end. 
Pig^ G. A longitudinal section from near the apical end of the outermost whorl. 
P’ig. 7. — Ajjical chamber and posterior half whorl. 
a. The cog-like processes of the apical end of the siphuncular tube in each 
chamber. 
h. Inner or ventral thickening band. 
c. Ligament-like body continued from the siphuncular caecum to the wall 
of the initial chamber. 
ch. Chamber ; c/d, first spherical chamber ; c/d, ch^, ch*, second, third, 
fourth chambers. 
psph. Blind apical end of the shell siphuncle, or siphuncular caecum. 
sj). Septum. 
sph. Prolongation of the septum into its siphuncular tube. 
