List of reference letters. 



Skull, 



al ; alisplienoid 

 ao", ao', ao: preorbifals 



eo: exoccipital 



ep: epiotic 



f: frontal 



mes: mesethmoid 



na: nasal 



ob: basioccipital 



pa: parasphenoid 



pf: postfrontal 



prf: prefrontal 



pro: prootie 



pt: posttemporal 



so: supraoccipital 



sq: pterotic (squamosal) 



vo: vomer 



Mouth parts, 

 an : angular 

 ar: articular 

 (I : dcntary 



i: intermaxilla 

 mx : maxilla 



Suspensoi'v ii|i|i:u'alus. 

 ect : ectopterygoid 

 ept : entopterygoid 



by: hyomandibular 



mt: metapterygoid 



pa: palatine 

 pro: preoperciilum 



qu: quadrate 



sy: symplectic 



Opercular apparatus, 

 io: interoperculuni 

 o: operculum 

 s: suboperculum 



Hvoid. ' 

 ch: ceratohyal 

 eh: epibyal 

 gl : glossohyal 



liy': lower hj'poliyal 

 liy": upper hypohyal 



r: branchiostegal ray 

 st: stylohyal 



u: urohyal 



Hraiirliial skeleton. 

 1— V: gill-arches 



c: ceratobranchial 

 co: copula (basibraiichial) 



e: epibranchial 

 liy: hypobranchial 

 ph : pharjngohranchial 



Slioulrter-girdle aud pectoral arcl 

 ba: basais (pterygials) 

 cl : clavicle 

 co: coracoid 

 pel : postclaviclc 

 pt: posttemporal 

 sc: scapula 

 sel : supraclavicular 



