210 



PROF. W. K. PARKER ON THE MORPHOLOGY 



DESCRIPTION OF THE PLATES. 



The abbreviations used in the different figures are as follows 



al.s. Alisphenoidal region. 



a. p. Ascending process of sus- 



pensorium. 

 ar. Articulare. 



a.sc. Anterior semicircular canal. 

 a.tr. Apex of trabecula. 

 cm. Auditory capsule. 

 au.c. Auditory capsule (or cavity) . 



b.br. Basibranchial. 

 b.hy. Basiliyal. 



b.o. Basioccipital region (or rudi- 

 ment) . 



c.br. Cerato-branchial. 

 c.hy. Cerato-hyal. 

 co. Columella. 

 c.tr. Cornu trabecular. 



d. Dentary bone. 



e.eth. Ectethmoidal bone. 



e.n. External nostril. 



e.o. Exoccipital. 



ep. Epiotic. 



e.pa. Ethmo-palatine cartilage. 



e.pff. Epiptcrygoid cartilage. 



eth. Etbmoid. 



/. Frontal bone. 

 f.m. Foramen magnum. 

 fo. Fontanelle. 

 fs.o. Fenestra ovalis. 



h.hy. Hypobyal. 

 h.sc. Horizontal 

 canal. 



i.n. Internal nostril. 

 i.n.c. Internasal cartilage. 



w. 



Investing mass. 



semicircular 



Ix. Larynx. 



rn.h.l. "Mandibulo-byoid ligament. 

 mk. Meckel's cartilage. 

 m.n.p. Middle nasal passage. 

 mx. Maxillary bone. 



n. Nasal bone. 



na. Nasal roof-cartilage (nasal 



" paraneural "). 

 nc. Notocbord. 

 n.px. Nasal process of premax- 



illary bone. 



oc.c. Occipital condyle. 

 od.v. Odontoid vertebra. 

 ol. Olfactory capsule. 

 o.s. Orbito-spbenoidal region. 

 ot.p. Otic process of suspen- 

 sorium. 



/;. Parietal bone. 

 pa. Palatine bone. 

 pa.s. Paraspbenoid bone. 

 pd. Pedicle of suspensorium. 

 pff. Pterygoid bone. 

 p.pa. Posterior palatine bone. 

 p.pff. Palato-pterygoid bone. 

 p.px. Palatine region of pre- 



maxillary bone. 

 pro. Prootic bone (or region) . 

 p.sc. Posterior semicircular canal. 



px. Premaxillary bone. 

 py. Pituitary body-space 



or 



region. 



q. Quadratum (bone or region of) . 



s.mx. Septo-maxillary bone. 



s.o. Supraoccipital region. 



sp. Splenial bone. 



sp.e. Sphencthmoidal bone. 



sp.t. Spbenoidal teeth. 



sq. S(juaniosal bone. 



st. Stapes. 



t.cr. Tegmen cranii. 



tr. Trabecula. 



t.ty. Tegmen tympani. 



v. Vomer. 



Plate XIV. 



Fig. 1. Skull of an embryo of Salamandra maculosa, three-fourths ripe (1st Stage), upper view, 

 x 17 diameters. 



2. The same, lower view, x 17 diam. 



3. The visceral arches of the same skull, upper view, x 17 diam. 



4. Vertically transverse section through fore part of nasal region of a similar skull, x 17 diam. 



