The head has a dark fringe of hair on the cheeks directed backwards to the ears.

All the spines are a little bent, and have their points directed backwards towards the oesophageal opening.

Nuchal crest large, its spines falciform and directed backwards, the longest about as long as the diameter of the orbit; some rows of smaller spines at the base.

The cephalic angle carries a slender spine of almost equal length as the glabella, directed backwards and outwards at about 45 .

The zoea larvae bear "exceptionally long" spines on the carapace, one directed forwards, and two directed backwards.

As a rule, snakes have simple teeth, all roughly the same shape, long, pointed and directed backwards when the mouth is closed.

The mouthparts comprise a labrum, directed backwards over the mouth and pairs of mandibles, paragnatha, maxillules and vestigial maxillae.