EXPLANATION OF PLATE 28 



Fig. 2. Lateral view of eiauium, Htpfuiichus macula'iis (% natural size). 



Fig. 3. Lateral view of cranium with first and second arches attached. 



a.c, auditory capsule; o.pr., antorbital process; b.a., basal angle; 6.r., branchial cartilag- 

 inous rays; I., labial cartilage; ex.-h., extra-hyoid cartilage; f.a.c, foramen of anterior cere- 

 bral vein; f.II., optic foramen; f. III., oculomotor foramen; f.IV., trochlear foramen; 

 f. VIP., facial foramen; f. IX., foramen for ninth cranial nerve; f.o. VII., opthalmic foramen 

 for seventh nerve (leaving orbit); f.r.a., foramen for ramus anastomoticus artery; I'.o., inter- 

 orbital canal; md., mandible; n.c, nasal cartilage; o.f., orbital fissure; o.-n., orbito-nasal 

 canal; o.-n'., orbitonasal canal (entrance to orbit); ol.c, olfactory capsule; or.p., orbital 

 process; po.o., postorbital process; pr.o., preorbital process; p.-q., palato-quadrate cartilage; 

 qd.q., quadrate process; s.o., supraorbital crest. 



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