SKULL — 'GANOIDS 



103 



Crossopterygians (tig. no) may have several gulars. The large 

 quadrate is loosely connected with the hyomandibula without a 

 symplectic. 



Fig. 1 10. — Skull of Osleolepsis (Gregory, '15, from Pander), lines of dots, lateral 

 line canals, an, angulare; d, dentale; ds, dermoccipital; /, frontal; g, gular; io, inter- 

 operculum; /, lacrimal; m, ma.xilla; n, nasal; op, operculare; p, parietal; po, postorbital; 

 prf, prefrontal; qj, quadratojugal; so, suboperculum; 55, squamosal; st, supratemporal; 

 /, tabulare; 3, zygomatic. 



Fig. III. — Chondrocrania of Lepidosteus. A, 10 mm. long; B, 11 mm.; C, 14 mm. 

 (Veit, 'ii). ch, ceratohyoid; ih, interhyal;j, jugular notch; w, Meckelian; k, notochord; 

 p, parachordal; pp, pole cartilage; pq, pterygoquadrate; ps, sphenolateral; t, trabecula. 



HoLOSTEl. — The chondrocranium of Lepidosteus in the early stages 

 (fig. Ill) has each' trabecula in two parts (.-1) the posterior being the polar 

 cartilage of Veit. The sphenolateral joins the otic capsule (C) long before it is 



