NO. 1232. ON APHAREUS FURCATUS— JORDAN AND STARRS. 721 



continuou.s dorsal with the lust rays of the dorsal and anal filaiiientous, 

 and in having- the alisphenoids attaehed medially restricting- anterior 

 opening- to the brain ease to a narrow space above them between two 

 descending- wings from the frontals, and a foramen behind them in 

 front of the b;isisplienoid. Aj}han>/s more closely resembles Eteli^ in 

 the character of the periotic reg-ion, it ])eing- ''little convex, and with 

 the l)ones thick and unpolished/' 



THE SKELET.VL CHARACTERS OF .VPHAKEUS FCRCATL'S IX DETAIL. 



Vomer toothless; at the anterior end somewhat trilobate; the middle 

 portion rounding- upward while the lateral parts recurve backward 

 and downward. 



Ethmoid wider than deep with the usual median ridge little developed. 



Prefrontals heavy, swollen, with the articular fascets for the pala- 

 tine and preorbital well developed, and with the usual foramen for the 

 passag-e of the olfactory nerve. They scarcely touch each other pos- 

 teriorly, there being- much cartilage interposed between them and 

 aliove and below. 



Frontals- thick and sculptured with tine tracing- uuich as in Luti- 

 ((II IIS iiya. 



Behind projection on sphenotic to which suborbitals attach is an 

 unusualh' deep socket into which the rounded anterior part of hyo- 

 mandilnilar head tits. 



Parietals widely separated by supraoccipital, and with a well-devel- 

 oped crest. 



Epiotic developed into an acute point, but not extending- backwards 

 as a shelf. Over it lies the upper limb of post temporal. 



Supraoccipital crest rising well upwards. Anteriorly not extending 

 beyond supraoccipital. Posteriorl}'^ extending- well back and merging 

 imperceptibly into ligamentous tissue. 



Basioccipital, prootic, pterotic, and opisthotic typical. To the last, 

 lower limb of posttemporal attaches by ligament. 



Parasphenoid wide under m3"odome. Laterally sending processes 

 about half way up prootics. Posteriorly ending in two points and 

 inclosing three sides of the rectangular opening into myodome. 



Basisphenoid developed downward and backward as a spine. A 

 thin lamella of bone developed from its anterior edge reaching to the 

 parasphenoid. 



Exoccipitals meeting above and Indow foramen magnum entirely 

 surrounding it. 



Alisphenoids particularly large, attaching suturally to each other, 

 and restricting the anterior opening to the brain case to a narrow slit 

 above them between two descending wings from the frontals, and to a 

 very small semic-ircular opening below them, which latter is not nearly 

 so large as foramen magnum. 



Proc. N. M. vol. xxiii 4() 



