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L. S. STONE 



ABBREVIATIONS 



alv., alveolaris VII nerve 



an., angular group of sense organs 



mi., ear 



buc, ramus buccalis VII 



br., brain 



bv., blood vessel 



c. c, neural-crest cells 



ch., notochord 



chy., ceratohyal 



dl., dorsal body line of sense organs 



e., eye 



ect., ectoderm 



epi. VII., epibranchial olacode of VII 



epi, IX., epibranchial placode of IX 



epi. X., epibranchial placode of X 



ex. g., external gill 



gas. g., gasserian ganglion 



gas. pi., gasserian placode 



jg., jugularis VII nerve 



hh., hyohyal 



hm., hyomandibular group of sense 

 organs 



hmd. th., ectodermal thickening in 

 dorsal hyomandibular cleft 



hy. a., mesoderm of hyoid arch 



hy. cc, hyoid crest-cell group 



hy. in., hyoid muscles 



io., infra-orbital group of sense organs 



I. e. t., longitudinal ectodermal thicken- 

 ing 



mb., mandible 



md., mandibular group of sense organs 



md. a., mesoderm of the mandibular 

 arch 



md. cc, mandibular group of crest 

 cells 



md. m., mandibular muscle 



md. V ., truncus mandibularis V 



ment., mentalis VII nerve 



m. I., midbody line of sense organs 



ms., mesoderm 



na., nose 



0., occipital group of sense organs 



op. v., optic vesicle 



oph. g., ophthalmic ganglion 



oph. pi., ophthalmic placode 



oph. p. v., ophthalmicus profundus 



V nerve 

 ph., pharynx 

 pi., palatinus VII nerve 

 q., quadrate 

 s., somite 



so., supra-orbital group of sense organs 

 sup. VII, ramus ophthalmicus super- 



ficialis VII 

 th. m., thoracicohyoideus muscle 

 imp. m., temporalis muscle 

 tr., trabecula 

 V. hm., ventral hyomandibular group 



of sense organs 

 vl., ventral body line of sense organs 

 1-2 bb., first and second basibranchial 

 1 bb. cc, first basibranchial crest- 

 cell group 

 1-4 br. a., mesoderm of first to fourth 



branchial arches 

 1-4 br. cc, first to fourth branchial 



crest-cell groups 

 1-2 cbr., first and second ceratobran- 



chial 

 1-4 ebr., first to fourth epibranchial 

 1 s., first somite 

 1 int. r., first intersomitic ridge 

 VII g., facial ganglion 

 VII I. g., facial lateral-line ganglion 

 VII pi., facial lateral-line placode 

 IX Ig., glossopharyngeus lateral-line 



ganglion 



IX pi., glossopharyngeus lateral-line 

 placode 



7A' vis. g., glossopharyngeus visceral 

 ganglion 



X Ig., vagus lateral-line ganglion 

 X pi., vagus lateral-line placode 

 X vis. g., vagus visceral ganglion 

 X vis. t., vagus visceral trunk 



