Sandalops
Bathothaurna
Corynomrna
Taonidium
teuthowenia
Fusocranchia
Helicocranchia
Megalocranchia
FIG. 49. Genera of the Taoniinas arranged i n four groups possessing broadly similar
features. Progression down the figure shows a progressive loss of larval features.
See text for explenation (page 226).