96 
.ME. W. K. PARKER OK THE STRUCTURE AKD 
less, and the pterotic processes ( pt.o.) are much shorter. The parotic wings are much 
less, for this skull is only one-thirtieth wider than long. The canals are well marked 
(< a.s.c ., h.s.c., p.s.c.), also the whole occipito-auditory region is ossified, and this bone 
runs up to the optic fenestra (II.). Between and a little below these spaces the floor 
of the skull is cartilaginous ; but from thence up to the middle of the septum nasi, 
along the axis, the endocranium is all ossified, and the bone runs into the extremely 
large etlnno-palatine (e.pa.), leaving only the pre-palatine hook ( pr.pa .) soft. Above, 
the bone is continued nearly to the front of the broad transverse snout, so that there 
are only a few places where cartilage remains. Behind, only the outside of the 
auditory floor is left below, and the pterotic angle (pt.o.) above, whilst behind these 
parts only the condyles retain their bark of cartilage. The three fontanelles (fig. 6) 
are quite normal, but they are rather small, as there is very much ossified overgrowth 
of cartilage ( tegmen cranii). 
The orbital region is almost oblong, rather narrower in front than behind, and 
bulging very little. The roof (al.n.) of the nasal region is well developed ; the floor is 
of less extent than in C. ocellcitus, but the pro-rhinals (p.rh.) are large and hooked. 
The huge bony ethmo-palatines (e.pci.) help the bones to enclose the large circular 
nostrils (i.n.), which are wide apart; the palatine bones (pa.) are well developed, 
falciform, and with an additional inferior sharp crest. 
The pterygoids are feeble and sinuously inbent, with a much shorter part for the 
pedicle (pd.) than in the last; they have consumed nearly all the cartilage. The 
Eustachian passages (eu.), lying in their angle, is sub-pyriform in outline. 
The quadrate is well ossified by the quadrato-jugal (q.j.), and the condyles (pc.) 
are large well-made trochlea). The annulus (a,ty.) is large and perfect; the stapes 
(figs. 6, 7, and 10, st.) is oblique, emarginate, and has a boss ; the feeble columella has 
a large undivided emarginate unossified proximal part; the bony bar (m.st.) is feeble 
and curved. The extra-stapedial (e.st.) is a small irregular hook, and its ascending- 
process is fibrous. 
The mandible (fig. 8) is rather slender; it has a long condyle ( ar.c .), a sharpish 
coronoid crest (ar.), a short dentary (d.), and a well-formed mento-Meckelian (m.mkj. 
The stylo-hyal (fig. 7, st.h .) is confluent above ; the hyo-branchial apparatus (fig. 9) 
is similar to the last, very elegant in form, has its front lateral lobe dentate in front, 
its basi-branchial ossicle (b.hr.) divided in the middle, and there is a band of bony 
deposit along the edges of the basal plate ; the thyro-hyals (t.hy.) are long, straight, 
and slender. 
The nasal valve-cartilages (u.l l .u.P.) are well developed. 
The investing bones are also well developed; the fronto-parietals ( f.p .) cover the 
temporal and part of the epiotic region, just roofing the lesser fontanelles, behind, 
where they form a straight margin; also in front they form a straight margin, and only 
just cover in the large fontanelle (fig. 6). The nasals (n.) are large, but less irregular, 
convex, and ribbed than in the last. The marginal bones (px.,mx., q.j.) are all normal; 
