ESPECIALLY MYCTOPHOIDS 17 
orbit are long and narrow with the second one showing a slight posterior deepening. 
Three expanded infraorbitals lie posterior to the orbit covering practically the whole 
of the quadrate, metapterygoid and hyomandibular. 
The suspensorium of the lower jaw is inclined forwards with the quadrate condyle 
situated below the hind end of the orbit, unlike Ichthyotringa furcata which has a 
vertical suspensorium. The hyomandibular curves anteriorly in its lower regions 
and is shallow. The quadrate is large and forms a continuation of the forward curv- 
ature of the lower end of the hyomandibular. The endopterygoid is visible and is 
connected to the medial region of the ectopterygoid. It is completely covered 
ventrally with a uniform series of small teeth. The teeth on the ectopterygoid are 
larger and appear to be slightly recurved. 
The preoperculum is considerably larger than in Ichthyotringa furcata with the 
anterior edge curving forwards ventrally following the curvature of the posterior 
edges of both hyomandibular and quadrate. The posterior edge of the preoperculum 
remains vertical in position, thus the properculum has an expanded ventral region. 
The anterior edge is thickened and rounded but more posteriorly it is thinner. 
The tube which housed the preopercular sensory canal has several openings to 
the external surface throughout its length. The suboperculum is well exhibited 
with its anterior edge thickened and extended dorsally as a prominent spine lying 
medial to the operculum. This antero-dorsal spine is as deep as the main body of 
the suboperculum itself. 
Part of the hyoid arch is visible with a slightly elongated, shallow ceratohyal, fol- 
lowed by a shorter deeper epihyal. A prominent hypohyal lies anterior to the cerato- 
hyal, and a median urohyal extends backwards from the region of conjunction of the 
hypohyals. At least 8 branchiostegal rays are present (9 appear in Ichthyotringa 
furcata) but there may have been more. The first five articulate with the ceratohyal, 
the remainder with the epihyal. The branchiostegals gradually increase in thickness 
from the anterior region but they do not increase in length. 
What can be seen of the rest of the body is in agreement with the features already 
described in Ichthyotringa furcata. 
Incertae sedis 
Genus APATEODUS Woodward, 1901 
DiacGnosis (emended). Head little elongated but large and robust. Post- 
temporal fossa completely roofed. Parietals only just contact each other in the mid- 
line. Supraoccipital large. Orbitosphenoid and basisphenoid both present. 
Jugular canal present in the prootic. Posterior infraorbitals greatly expanded. 
Maxilla untoothed, forming two-thirds of the gape. Premaxilla laminate and 
toothed. Large supraorbital bone present. Mesocoracoid arch in the pectoral 
girdle. 
TYPE SPECIES. Pachyrlizodus glyphodus Blake. 
