!56 



CLAP P. [Vol. XV. 



REFERENCE LETTERS. 



A. = anal fin. 

 ac.b. = accessory membrane bone. 

 ac.md.l. = accessory mandibular line. 



a.L = anterior pit line of head (Amia). 

 an.r. = anterior root. 

 an.na. = anterior nasal aperture. 

 ar. = articular. 

 biic.f. = ramus buccalis facialis. 



cb. = cerebellum. 

 C.H. = cerebral hemispheres. 

 cJ. = cheek line. 

 <roff;.r//-Jr= commissure between r//and X. 

 const. = connecting strand, 

 i/. = dentary. 

 cf.b. ?'//= dorsal branch of V// nerve. 

 d.b.ll.n. = dorsal branch of nervus lineae lateralis. 

 d.b.rccf. = dorsal branch of recurrens facialis. 

 d./. = dorsal line. 

 d.od. = dorsal opercular line. 



efi. =. epiphysis. 

 F./f. = frontal. 

 f.g. = facial ganglion, 

 ^./.^glossopharyngeal nerve (Amia). 

 g-.g-. = Gasserian ganglion. 

 Ad. = horizontal pit line of cheek (.\mia). 

 /.O.C. = infraorbital canal (.^mia). 

 /Lr. = lateral line rudiment. 

 m. = muscles. 

 MX.C. ^= maxillary canal. 

 md.l. = mandibular line. 



m.e.f. = ramus mandibularis externus facialis. 

 md. = middle dorsal pit line of head. 

 «.//. = nervus hneae lateralis. 

 ti.c. = noto chord. 

 ec./. = supraoccipital foramen. 

 o//. = olfactory lobes. 

 OM.C. = operculo-mandibular canal. 

 OP. = operculum. 



op.f. = ramus ophthalmicus superfacialis. 

 o/id. = optic lobes. 

 O.S. = opercular spine. 

 ot.n. = otic nerve (Amia). 

 fi. = pore of canal. 

 P. = pectoral fin. 

 pigm. = pigment. 



pi. = posterior pit line of head (.\niia). 



