376 



ON THE SKULL IN THE PARAGUAYAN LEPIDOSIREN, ETC. 



References to Lettering. 



a.m.t. Anterior mandibular tooth-plate. 



an. Angular. 

 un.p. Antorbital process. 

 an.p 1 . Labial portion of antorbital process. 

 a.p.t. Anterior palatal tooth. 



ar. Articular surface of mandible. 

 ar.c. Articular extremity of suspensorial 



cartilage. 

 ut.p. Antorbital process of the palato-ptery- 



goid. 

 b.c. Cartilaginous " basis cranii." 

 b.c.v. Basicranial vacuity or cleft. 



c.h. Cerato-hyal. 

 cor.p. Coronoid process of the mandible. 

 c.r. " Cranial rib." 

 d.e. Dermal ethmoid. 

 ec.e. Dermal ectethmoid. 



e.o. Exoccipital. 

 f.p. Fronto-parietal. 

 hy.s.l. Hyo-suspeusorial ligament. 

 i.n.s. Internasal septum. 

 i.op. Interoperculum. 

 Id.c. " Lambdoid crest." 

 mk.c. Meckelian cartilage. 

 m.m.t. Middle mandibular tootb. 

 mp.t. Middle palatal tooth. 

 ms.e. Mesethmoid cartilage. 

 m.sy. Mandibular symphysis. 

 n.a. First neural arch. 

 n.c. Nasal capsule. 

 no. Notochord. 

 n.s. Nasal sac. 



n.sp. Neural spine. 

 op. Operculum. 

 p.c. Periotic capsule. 

 p.m.t. Posterior mandibular tooth. 

 pn.p. Prenasal process. 

 ji.pt. Palato-pterygoid bone. 

 p.p.t. Posterior palatal tooth. 

 ppt.a. Ascending process of the palato-ptery- 

 goid. 

 p.pt.a'. Spur on the ascending process of the 

 palato-pterygoid, to which the ect- 

 ethmoid is attached. 

 ps. Parasphenoid. 

 p.t. Palatal tooth (Ceratodus) . 

 p.sy. Palatal symphysis. 

 s.m.e. Spina mentalis externa. 

 s.m.i. Spina mentalis interna. 

 sn.p. Subnasal cartilage. 

 sp. Splenial. 

 sq. Squamosal. 

 sg.c. Sagittal crest. 

 s.r. Saccular recess. 

 st.p. Styliform process. 

 sus.c. Suspensorial cartilage. 

 tr.c. Trabecular cornu. 

 tr.c. Trabecular cartilage. 

 u.l.c. Upper labial cartilage. 

 ut.r. Utricular recess. 

 v.hy.r. Vestigial hyoidean rays. 



vo.t. Vomerine teeth. 

 1,2, ... First, second, . . , Branchial arches. 



Foramina. 



i. 

 ii. 

 iii. 



V.p. 



v'« 



Olfactory nerve. 



Optic nerve. 



Motor oculi. 



Ramus ophthalmicusoftheTrigeminus. 



Ramus maxillaris and the ramus man- 

 dibularis of the Trigeminus, the 

 Nervus Lateralis Facialis, and the 

 ramus communicans between the 

 Facial nerve and the lateral branch 

 of the Vagus. 



Branch of ramus ophthalmicus pro- 

 fundus (Trigeminus) . 



Branch of ramus mandibularis (Tri- 

 geminus). 



Ramus hyomandibularis (Facialis). 



vii". 



ix. 



x. 



h.s.c. 



m.c. 

 sp.n 1 . 



sp.n'. 



t.f. 

 v.s.c. 



Superior palatine hranch of the Facialis. 



Ramus mandibularis internus (Facialis) . 



Glossopharyngeal. 



Vagus, and internal jugal or anterior 



cardinal vein. 

 Ampullary extremity of the vertical 



semicircular canal and the horizontal 



canal. 

 Internal carotid artery. 

 Dorsal and ventral roots of first spinal 



nerve (Hypoglossal). 

 Dorsal and ventral roots of the second 



spinal nerve. 

 Temporal foramen {" Schlafengrube"). 

 Vertical semicircular canals. 



