SKELETON OF REQALECITS ABGENTEUS. 



31 



mcJc 



m.eth. 



m.n.c 



m.pt. 



ms.pt. 



mx. 



my. 



net. 



n.pl. 



n.pr. 



n.s. 



o.c 1 . 



o.c 2 . 



o.in. 



op. 



op.o.. 



pa. 



pa.br. 



pas. 



pc.f. 



p.cl. 



p.eth. 



ph.br. 



pi. 



pmx. 

 pmx '. 



p.n. 



; of occipital condyle. 



interspinous bone to the clemi- 



vertebra. 

 . Meckel's cartilage. 

 Mesethmoicl. 

 Meso-nasal cavity. 

 Metapterygoid. 

 Meso-pterygoid. 

 Maxilla. 

 Spinal cord. 

 Nasal. 



Neural plate. 

 Neural process. 

 Neural spine. 



Dorsal Ifacet. 

 Ventral J 



Os innominatura. 



Opercular. 



Opisthotic {op.o 1 , ascending pro- 

 cess; op.o 2 , anterior process; 

 op.o 3 , posterior process; op.o 11 , 

 descending process). 



Orbitosphenoid. 



Parietal. 

 1_2 . Parabranchials. 



Parasphenoid. 



Pectoral fin. 



Post-clavicle. 



Par- (or ecto-) ethmoid. 

 1-4. Pharyngo-branchials. 



Palatine. 



Alveolar portion of premaxilla. 



Nasal process of premaxilla. 



Prenasal cartilage. 



p.op. 



p.or.p. 



pr.o, 



pr.or. 



pt. 



pto. 



p.tm. 



Preopercular. 

 Postorbital pillar. 

 Pro-otic. 

 Pre-orbitals. 

 Pterygoid. 

 Pterotic. 

 Post-temporal. 

 pv.f. Pelvic fin. 

 pzy. Posterior zygapophysis. 

 qu. Quadrate. 

 r (in figs. 22 and 24). Strengthening ridges 



of centrum. 

 r 1 -^ (in fig. 4). Cutaneous ridges. 

 r s (in fig. 20). First rib. 

 sc. Scapula. 

 s.cl. Supra-clavicle. 

 Supra-occipital. 

 Subopercular. 

 Sphenotic. 

 sy (in fig. 14 and 15). Symplectic. 

 sy.sy 1 (in fig. 19). Symphyses of inno- 

 minate bone. 

 t.cr. Tegmen cranii. 

 tr.pr. Transverse processes, numbered 



in fig. 20. 

 u.hy. Urohyal or basi-branchiostegal. 

 V 1 . Foramen for orbitonasal nerve. 

 V 3 . Foramen for mandibular nerve (?). 

 vo. Vomer. 

 X. Foramen for vagus. 

 x^x*. Cartilaginous nodules on the dorsal 

 ends of the cerato-branchials. 



s.o. 

 s.op. 

 spo. 



Cartilage coloured mauve. 

 Cartilage-bone coloured yellow. 

 Periosteum, ligament, &c, coloured blue. 



