CHONDROCRANIUM OF EUMECES 159 
and backward. The point of union with the stalk divides the 
insertion plate into two unequal parts. The posterodorsal 
division, pars superior (p.s.), is short and thick; the anteroventral 
division, pars inferior (p.7.), is much more slender, but nearly 
twice as long. Extending downward and backward from the 
pars superior, close to the union with the stalk, is a well-marked 
outgrowth, the processus accessorius posterior or processus inter- 
hyalis (pr.ac.p.); the opposed processus accessorius anterius is 
barely suggested, if at all, by a slight rounded swelling on the 
other side of the insertion plate. In stage 6 the processus acces- 
orius anterior is clearly lacking. The relatively small size of 
the processus accessorius posterior and the loss of the processus 
accessorius anterior destroy entirely the cruciform appearance of 
the insertion plate, so striking in Gaupp’s figures of Lacerta. 
A great variety of blastemic, cartilaginous, or ligamentous 
connections of the columella auris with neighboring parts have 
been described. One of these, that with the quadrate and crista 
parotica through the processus dorsalis or its rudiment, has been 
discussed (p. 156). In Lacerta Gaupp describes the processus 
internus as in contact with the quadrate and bound to it by a 
cord of connective tissue; this connection is affirmed generally 
for the reptiles by Fuchs (’09), who describes still another con- 
nection with the quadrate, leading from the processus accessorius 
anterior. The connections mentioned by Moller (’05) and Peyer 
(12) in Vipera, and by Bender (712) in the turtles are seemingly 
of the latter type. A connection from the extracolumella to 
the lower jaw has been described by Fuchs (’07 a) and Kunkel 
(12 b) in Emys, and by Shiino (’14) in the crocodile; also earlier 
by Dollo (83) and Cope (’85) in lizards, and by Gadow (’88) 
in Sphenodon. The record of Gadow for Sphenodon is contra- 
dicted by Versluys (’98), and the structure in lizards interpreted 
as an artifact. Usually, at least, this connection is described 
as extending from the insertion plate of the columella to the 
retroarticular process of Meckel’s cartilage; but in some cases 
the data are not explicit—in fact, it is far from certain that all 
of these descriptions refer to the same structure. Another band 
is described by Versluys (’98) in some adult lizards as extending 
