The chief difference between this brain and that of the Turtle obtains in the large size of the optic lobe and cerebrum as compared with the cerebellum, in the more pyriform figure of the cerebral hemispheres, and in the transverse fissure of the cerebellum.

Most small worms have a pyriform shape. Larger worms living in unconsolidated sediments are cylindrical and elongate. Those in rock fissures or coral crevices have stouter and more pyriform bodies.

In fact, Clavigula is very similar to Glochidorella, differing from this mainly in the absence of perioral disc (vs. presence), shape of pharyngeal bulb (more cylindrical vs. more pyriform) and more robust spicules.

Pyriform

Meaning

Adj

Noun

Origin

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