ESPECIALLY MYCTOPHOIDS 31 
been found convenient to re-erect the genus Apateopholis and to ally it with the 
ichthyotringids, but the differences are such as to warrant its removal into a 
separate family. 
DEscriPTION. Neurocranium. The neurocranium is shown in dorsal view in 
Text-figure 13. In general shape the neurocranium is long, narrow and deepened 
posteriorly with a shortened cranial cavity. The anterior region of the neurocranium 
is drawn out into an extremely long projection which forms the basis of the rostral 
region. The length of the neurocranium is approximately half that of the body from 
the occiput to the caudal peduncle. The orbits are enormous, their diameter 
Fic. 13. Apateopholis laniatus (Davis). Neurocranium in dorsal view. 
being much in excess of the postorbital length of the head. The frontals form the 
majority of the skull-roof and above the orbit the lateral edge bears an ornamenta- 
tion of bony tubercles. The sphenotic forms the upper posterior border to the orbit 
and extends ventro-laterally from beneath the frontal. The sphenotic joins the 
prootic ventro-laterally to form the anterior part of the hyomandibular facet. The 
lower edge of the sphenotic and the upper edge of the prootic are both expanded and 
excavated to produce two cup-shaped depressions into which the anterior region of 
the head of the hyomandibular rests. Dorsally the sphenotic contacts the pterotic in 
