302 THE CEPHALOPODA 
Rossia and Sepia, but are much more intimately united in Sepiola, 
and are almost entirely fused together in Spzrula (in which genus 
OTe 
‘ \\ 
- 1 
Li 
at 
Fic. 268. 
Spirula, a nearly median sagittal section, seen from the left side. a, anus; ar, arms; @.f, 
aboral fossa; b.d, bile-duct ; ¢.c, cephalic cartilage; c.g, cerebral ganglion; d.m, dorsal man- 
dible ; fc, funnel collar ; fi, fin; fu, funnel ; 7.b, ink-bag ; i, lip; liv, liver; ma, mantle; ma’, 
shell secreting part of the mantle; oe, oesophagus; 0.g, optic ganglion; ot, otocyst; pa.c, 
pallial cavity ; p.g, pedal (brachial) ganglion; pn, ‘“‘pancreas”; p.s, pyloric sac; 7a, radula ; 
s.g, salivary gland; sh, shell; si, shell siphuncle; sp, last septum of the shell; st, stomach ; 
t, tentacular arm ; t.d, pallial terminal disc; to, tongue; v.m, ventral mandible; v.n, visceral 
nerve; w.b, white body. (After Huxley and Pelseneer.) 
the liver is partly contained in the last chamber of the shell, Fig. 
268, liv), in Onychoteuthis, Ommatostrephes, Loligo, and the Octopoda, 
with the exception of Argonauta. In these last cases the liver 
