NO. 1366. 



OSTEOLOGY OF BKRYroll) FISIIES—STARKS. 



005 



f rentals. The basisphenoid sends a process down to the parasphenoid. 

 The process is extremeh^ slendei* above, but grows wide below. The 

 alis})henoids do not meet at the median \mv. The orbito.spheiioids are 

 moderate in siz«\ and no suture is visil)lc between them. There is a 

 median hole in front of which th(\v are drawn out into a ver^' sharp, 

 tliin keel. The parasphenoid sends uj) large basitemporal wings, and 

 spreads widely over the lower surface of the auditory bulhe. It 

 extends posteriorly over the anterior fourth of the basioccipital, end- 

 ing in a very small, slender, sharp process. Tiie prefrontals are large 

 bones pierced at their center by the olfactor}' foramen. They are 

 separated only by cartilage except at their upper ends anteriorl}-, 

 where the small ethmoid is interposed. The ethmoid is almost obso- 

 lete. It is a small thin bone, overlying cartilage, and it does not 

 extend half the distance between its upper edge and the vomer. The 



Fli;. (i.— IldPLOSTETHUS JAPOXICUS. aS, ALISPHENOID; ho, basioccipital; bs, BASISPHENOID: C. EPIOTIC; 



eii. kxoccipital; et, ethmoid; /, frontai,; n, nasal; op, oipsthotic; a^•, orbitosphexoid: it. pari- 

 etal; pf. prefrontal; ;))•, prootic; jjx, parasphenoid; pt, pterotic; .s. sphenoid; bo. si'praocci- 

 pital; v. vo.mer. 



nasals are very large bones, attached for nearly their whole length to 

 each other, and by their entire posterior end to the wide frontals. 

 They arch wideh' over the prefrontals, inclosing a chainl)er behind 

 tlu'm. 



FACE BOXE«. 



The hyoniandibular has an undivided head. From its iimer upper 

 edge a slender process descends toward a shorter one on the metai)- 

 terygoid, but does not nearly ri'ach it. The metapter3'goid has no 

 foramen. Its lower part is scarceh" ossiticd. The symplectic is long 

 and slender. Between its lower side and the angle of the preopercle 

 there is a large open space. The preopercle is long, and the edges of 

 its vei'tical liml) are parallel. .\t its angle two bridges of lace-like 

 l>()ne span a large, deep channel; the lower one is nuich the larger and 

 projects back as a stout spine. The suboperch^ is scarcely ossified. 

 The angular is present. There is a large* channel along the lower side 



