ig. 44. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
. 45, 
46, 
47. 
48. 
49. 
51. 
. 2. 
. 53. 
Coe and Kunkel— California Limbless Lizard. 403 
Highly magnified portion of fig. 47, showing the differentiation of 
the epithelium of the paraphysis (py) and the post velar arch (e’). 
x 409. 
Another portion of fig. 47 more highly magnified, showing the rudi- 
ment of the fornix (c.a) and the ependyma cells (e) which become 
differentiated to form the paraphysis (py) and the post velar arch 
of the previous figure. x 409. 
PLATE XLVII. 
A portion of fig. 47 through the epiphysis (ep) and the post velar 
arch (e’), showing the details of cell structure. x 457. 
Slightly oblique sagittal section of portion of brain of a 60™™ 
embryo, showing the relationship of the various parts of the pineal 
apparatus. The paraphysis (py) arises anterior to the velum 
(v.t), the third ventricle becomes greatly extended dorsally to 
form a more or less tubular sac, which lies just anterior to the 
epiphysis (ep). The superior (e.s) and posterior commissures 
(c.p) are situated very close together. x 67. 
Sagittal section of portion of pineal apparatus of a 56™™ embryo. 
The tubular distal end of the paraphysis (py) is shown extending 
posteriorly and overlying the epiphysis (ep). Immediately above 
the posterior commissure (c.p) is seen the smaller superior com- 
missure. x 67. 
Portion of fig. 50 more highly magnified, showing the integument 
(ed, d) attached closely to the underlying parietal bone (pa) by 
means of very stout connective tissue fibers (c.t). The pigment 
of the skin which is absent above the pineal eye is shown at pg. 
x 325. 
Portion of sagittal section of head of adult, showing the pineal eye 
(pin) situated in a pit on the ventral side of the parietal bone 
(pa) embedded in vacuolated tissue (v). The fleck of skin which 
remains fast to the skull when the skin is peeled off from the rest 
of the body is shown and also the large blood vessel (6.v) which 
lies between the cerebral hemispheres. x 45. 
Sagittal section of head of embryo, part of which is represented in 
fig. 47. The pineal eye is seen in the ventral portion of the 
dorsal wall of the head, situated just above the union of the 
cerebral hemispheres and olfactory lobes. x 40, 
PLATE XLVIII. 
Sagittal section of pineal eye of 45"" embryo, showing a moder- 
ately convex lens. x 437. 
Transverse section of pineal eye of embryo shortly before birth, 
showing a less convex lens. x 437. 
Sagittal section of pineal eye of 60™™" embryo, showing a very 
much flattened form with an exceedingly convex lens. x 437. 
