The ÖOsteology of Dallia pectoralis. 255 
(GILBERT |]. c.). It is a long slender curved bone, not widened at 
its lower end, extending some distance below the maxillary. Its 
upper end is attached a short distance below that of the premaxillary, 
or opposite to the place where the palatine process is attached. 
There is no backward extending process from the latter bone. 
There are no suborbitals present. In front of the eye is a 
small curved tubular preorbital. 
Hyoid and branchial arches. 
The hyoid apparatus offers little that is different from the usual 
condition. The inter-, epi-, cerato-, hypo-, glosso-, and urohyals are 
all present. The epi- and ceratohyals each carry four branchiostegal 
rays. The latter bone is unpierceed by a neural foramen. The 
hypohyals are paired; the lower element is much the larger. There 
are no keels or ridges on the small thin urohyal. 
There are but two toothed superior pharyngeals on each side. 
The posterior one is the larger, ovate in outline, and attached to 
the epibranchial of the last arch. The anterior one is only about 
half covered by the tooth patch, which is triangular in shape. It 
is articulated with the third arch. The first and second epibranchials 
each carry a short broad pharyngeal without teeth, that of the first 
the smaller. The lower pharyngeals meet at the median line but 
are not anchylosed, or suturally attached. The hypobranchial of the 
fourth arch is absent as usual. There are four basibranchials 
present; one to each arch. The two posterior ones are armed with 
teethh similar to those on the lower pharyngeals. 
Shoulder and pelvic girdles. 
The upper limb of the posttemporal lies free two or three milli- 
meters behind and parallel to the posterior upper edge of the epiotic, 
being attached to it, however, by a narrow band of connective tissue. 
Its tip meets that of its opposite fellow at the dorsal median line. 
The lower limb of the posttemporal has been rather fully reported 
upon by Dr. GILsBerT. The posttemporal “seems at first sieht to 
lack entirely the inner fork to join the pterotic process of the 
cranium. Closer examination shows, however, that a strong ligament 
replaces the lacking arm, and answers to it in all its relations. 
We find, furthermore, that while in some specimens it retains its 
