THE SKULL OF CHIMERA. 



143 



Fische. II. Teil." Jenaisehe Zeit. f. Naturwiss. 

 Bd. xii. Jena. 



Wright, R. R. — 1884. "On the Nervous System and Sense 

 Organs' of Amiurus." Proc. Canad. Inst. vol. ii. No. 3. 

 Toronto. 



EXPLANATION OF THE PLATES. 



The figures are all natural size. 

 Plate I. 



Fig. 1. Lateral view of the head of Chimcera colliei, showing the latero-sensory 

 canals and the anipullary pores. 

 2. Median view of the bisected skull. 



Plate II. 



Fig. 3. Lateral view of the skull, with the labial and nasal cartilages in place. 



4. Lateral view of the anterior end of the skull, with the ala nasalis and the 



cartilage I in place but the other labial and nasal cartilages removed. 



5. The same, with the ala nasalis and cartilage I removed, 



6. Ventro-anterior view of the end of the snout . 



Plate III. 



Fig. 7. Dorsal view of the skull. 



8. Ventral view of the skull. 



9. Posterior view of the skull. 



Index Letters. 



a, cartilage a of Ilubrecht's descrip- 

 tions. 



ab, foramen for nervus abducens. 

 acr, foramen for arteria centralis 

 retina?. 



acv, foramen for anterior cerebral vein. 

 adp, anterior dental plate. 

 aec, anterior opening of ethmoidal 

 canal. 



ant, antorbital process. 

 ccr, cavuin cranii. 



e, cartilage e of Ilubrecht's descrip- 



tions. 

 ec, ethmoidal canal. 

 epsb, foramen for efferent pseudo- 

 branchial artery. 



f, foramen for nerve and artery. 



f , foramen for branch of nervus 



ophthalmicus. 

 fa, foramen for nervus facialis. 

 fn, fenestra nasalis. 

 fv, foramen for branch of vena nasalis. 

 fvn, foramen for vena nasalis. 



g, cartilage g of Hubrecht's descrip- 



tions. 



kmc, hyomandibular latero - sensory 

 canal. 



hmf, foramen for nervus hyoideo-man- 

 dibularis facialis. 

 Jiy, hypophysial groove. 

 to, cartilage Jc of Ilubrecht's descrip- 

 tions. 



Irp, lateral rostral process. 

 m, cartilage m of Ilubrecht's descrip- 

 tions. 



md, mandibula. 

 mdl, mandibular labial. 

 mlf, mandibular labial fold. 

 n, process of cartilage k. 

 no, nasal capsule. 

 nlf, nasolabial fold. 



o, foramen for nervus opticus. 

 obc, outer buccalis latero - sensory 

 canal. 



ocm, foramen for nervus oculomotorius, 

 opf, foramen for nervus ophthalmicus 



profundus. 

 oph, foramen for nervus ophthalmicus 



superficialis. 

 pdp, posterior dental plate. 

 pec, posterior opening of ethmoidal 



canal. 



pf, foramen for nervus palatums 

 facialis, 



pfg, perforation for pedicel of carti- 

 lage/?. 

 pub, prenasal beak. 

 pnd, prenasal depression. 

 pq, palatoquadrate. 

 pre, premaxillary lip. 

 pst, postorbital process. 

 ptf, pituitary fossa. 

 pnd, posterior upper labial. 

 pv, foramen for pituitary vein. 

 smxf, supramaxillary fold. 



soc, supraorbital latero-sensory canal. 

 sos, suborbital shelf. 

 subc, suborbital latero-sensory canal. 

 t, foramen for nervus trochlearis. 

 tr, foramen for nervus trigeminus. 



