CHONDROCRANIUM OF EUMECES 179 
parietalis media; two, the fenestra optica (fen.op.) and the 
fenestra metoptica (fen.m-op.), are in a lower row, ventral to the 
taenia parietalis media; the fifth, the fenestra prootica inferior 
(fen.pr-ot.1.), extending from the basal plate to the taenia mar- 
ginalis, may be interpreted as common to both rows. The 
fenestrae of the two rows are of widely different significance. 
Those of the upper row, including the dorsal part of the fenestra 
prootica inferior, are without relation to important organs; on 
the other hand, each fenestra of the lower row, including the 
ventral part of the fenestra prootica inferior, affords exit for one 
or more of the cranial nerves. As the relations are almost iden- 
tical with those in Lacerta, they demand only brief summary. 
The names of the fenestrae are unchanged from Gaupp, except 
for the specification, as superior and inferior, of the two fenestrae 
into which the fenestra prootica is divided by the posterior con- 
tinuation of the taenia parietalis media. For simplicity, only 
the four terms, anterior, dorsal, posterior, ventral (always in 
this order), are used in bounding the fenestrae, the usually more 
or less conspicuous obliquity and other irregularities of the 
boundaries being disregarded. 
Fenestra epioptica (fen.e-op.), bounded by the posterior edge 
of the solum supraseptale (anterior), the taenia marginalis (dor- 
sal), the pila accessoria (posterior), and the taenia parietalis 
media (ventral). 
Fenestra prootica superior (fen.pr-ot.s.), bounded by the pila 
accessoria (anterior), the taenia marginalis (dorsal), the taenia 
parietalis media (posterior and ventral). The subdivision of 
this fenestra by a band of questionable cartilage (7) has been 
noted. 
Fenestra optica (fen.op.), bounded by the edge of the septum 
interorbitale (anterior), the taenia parietalis media (dorsal), 
the subiculum infundibuli (posterior), and the cartilago hypo- 
chiasmatica and the edge of the septum interorbitale (ventral). 
As indicated by the name, this fenestra serves as the exit of the 
. optic nerve (n.I/.). . 
Fenestra metoptica (fen.m-op.), bounded by the subiculum in- 
fundibuli and cartilago hypochiasmatica (anterior), the taenia 
