556 ^Journal of Cojnparative Neurology and Psychology. 



EXPLANATION OF THE PLATES. 



REFERENCE LETTERS. 



acc. branch of the X nerve supplying the anterior part of the trapezius muscle. 



ags. angulo-splenial bone. 



alv. r. alveolaris VII. 



a!v.{l). first anastomosing branch between r. alveolaris VII and r. pretrematicus IX. 



alv.{2). second anastomosing branch between r. alveolaris VII and r. pretrematicus IX. 



alv.{^). branch of r. alveolaris VQ that supplies roof of mouth. 



alv.{/i). branch of r. alveolaris VII that anastomoses with r. mandibularis V. 



am. muscles of the arm. 



ao. antorbital cartilage. 



auc. cartilage of the ear capsule. 



auo. ossifications of the ear capsule. 



aur. r. auricularis X. 



hhy, basihyal cartilage. 



bplx. branches of the brachial plexus. 



lhr.,2hr.,^hr. first, second and third branchial arches. 



hue. r. buccalis VII. 



buc.{i),buc.{2). branches of the r. buccalis VII that anastomose with the r. oph. prof. V. 



ch. cerebral hemisphere. 



cki. m. ceratohyoideus internus and branches of IX nerve innervating it. 



chi.X.i. branch of the second branchial nerve inner\'ating m. ceratohyoideus internus. 



chy. ceratohyal. 



cor. coracoid cartilage. 



dent, dentary bone. 



dien. diencephalon. 



dl. m. dorsolaryngeus. 



din. branches of the X nerve innervating the dorsolaryngeus muscle. 



dm. m. depressor mandibulae. 



dma. anterior division of m. depressor mandibulae and the nerve innervating it. 



dmp. posterior division of m. depressor mandibulae and nerve innervating it. 



/c. fasciculus communis. 



fm. fasciculus longitudiaalis medius. 



jr. frontal bone. 



gac. ganglion acusticum. 



gen. ganglion geniculatum. 



gg. ganglion Gasseri. 



gh. m. geniohyoideus. 



g.i.sp. first spinal ganglion. 



g.VIIha. ganglion on "dorsal VII." 



g.VIIhh. lateral line ganglion fused with ganglion acusticum. 



g.VII-VIII. acustico-facial ganglion. 



g.IX-X. ganglion common to IX and X nerves. 



h, humerus. 



hgl. n. hypoglossus. 



hhy. hypohyal cartilage. 



hm. tr. hyomandibularis VII. 



hy. hyoid arch. 



ih.4. m. interbranchialis 4 = m. hyotrachealis. 



ih. m. interhyoideus and branches of r. jugularis VII inner\'ating it =■ m. mylohyoideus 



posterior. 



im. m. intermandibularis = m. mylohyoideus anterior. 



int. rr. intestinales X. 



int.-acc. r. intestino-accessorius X. 



int.rec. r. intestinalis recurrens X. 



io. m. obliquus inferior. 



jc. Jacobson's commissure. 



jc.(a). branch of Jacob sox's commissure innerv'ating the roof of the mouth. 



