PLATE II. 
Figs. 1-3.— Spirula (australis ?), female (“ Blake ” specimen). 
Fig. 1.—Ventral view. 
Fig. 2.—Lateral left view. 
Fig. 3.—Terminal (aboral) view. 
Letters as in PI. I.:— ctq., tlie papillae for the opening of the kidneys; cr., inner 
hand of ckromatophores ; I., infundibulum ; Ipa., lateral pallial apophyses. 
Figs. 4-7.— Spirula peronii, structure of the shell. 
Fig. 4.—A septum, in face. 
Fig. 5.—A longitudinal median section from near the anterior end. 
Fig. 6.—A longitudinal section from near the apical end of the outermost whorl. 
Fig. 7.—Apical chamber and posterior half whorl. 
a. The cog-like processes of the apical end of the siphuncular tube in each 
chamber. 
b. 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 ; ch 2 , ch 3 , ch 4 , second, third, 
fourth chambers. 
psph. Blind apical end of the shell siphuncle, or siphuncular caecum. 
sp. Septum. 
sph. Prolongation of the septum into its siphuncular tube. 
