No. I.] ANATOMY OF SCOMBER SCOMBER. 305 



£//. Epihyal. 



ENP. Entopterygoid. 



EO. Exoccipital, occipitale externum (Sag.), epiotic (Bridge). 



epr. Epiphysial ridge. 



es. Eyestalk. 



ESC. Extrascapular (Sag.), supratemporal (Bridge). 



ETH. Ethmoid. 



ffr. Facial foramen. 



FR. Frontal. 



fo. Facial opening of trigemino-facial chamber. 



gc. Ciliarj' ganglion. 



gl- Nervus glossopharyngeus. 



glfr. Glossopharyngeal foramen. 



gsy. Sympathetic ganglion. 



IIB I-IV. First to fourth hyobranchials. 



Iif- Ramus hyoideus facialis. 



^ifn. Hypophysial fenestra. 



HH', IIH'' Two ossifications of the hypohyal. 



Hki'i . Deeper portion of hyohyoideus. 



Hhi^. Superficial portion of hyohyoideus. 



HMD. Hyomandibular. 



hinf. Truncus hyoideo-mandibularis facialis. 



hms. Horizontal muscle septum of trunk muscles. 



HR. Horizontal rib. 



lad I- F. First to fifth interarcuales dorsales. 



■^C. Intercalar (Sag.), opisthotic (Bridge). 



ic/r. Internal carotid foramen. 



'<"• Ethmoid incisure. 



;Vi-2i . Infraorbital groups of pores nos. 1-21, or trunk canals leading 

 to those pores. 



?i8//i^. Pore at union of infraorbital and lateral line canals. 



/w. Intermandibularis. 



/OP. Interoperculum. 



ip- Preorbital incisure. 



IPB I-IV. First to fourth infrapharyngobranchials. 



i^^pnfig. Double group of pores at union of infraorbital and preoperculo- 

 mandibular canals. 



i^^s'g. Double group of pores at union of infraorbital and supra- 

 orbital canals. 



LA. Lachrymal. 



Labe I- V. Levator arcus branchialis externus of first to fifth branchial 

 arches. 



Labi . Levator arcus branchialis internus, anterior muscle. 



LabiP. Levator arcus branchialis internus, posterior muscle. 



Lap. Levator arcus palatini. 



Le. Levator muscle of the pectoral fin. 



Ig. Lagena. 



M. Aleckel's cartilage. 



mdc. Mandibular lateral canal. 



