56 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
EXPLANATION OF PLATES. 
Figures 13, 14, and 16 are of Bothus maculatus. All others are of Pseudopleu 
ronectes americanus. All except Figure 11 were outlined with the camera lucida. 
a. 
Gia te 
arc. eth. m. 
ba-hy. 
can. smv’cre. 
eb.(dx.5:s.) 
cbl. 
chs. opt. 
cl. crt. 
coms hz. 
cp. gnic. 
cert. mk. (dz.,s.) . 
crt. orb. a. . 
ert. pin. d. 
ec’eth. (dz., s.) 
eth. . 
eth-f. 
Sori olf. (dz., $:)' 
ju.iolf. (dz.,:s.) 
ABBREVIATIONS. 
Anterior. gl. pin. . 
Anus. gn. hab. 
Mesial cartilage arch ham. eth. 
of the ethmoid. 
Basi-hyal. 
Semicircular canals. hy-md. . 
Cerebrum __ (right i’cis. eth. (dx., s.) 
lobe, left lobe). 
Cerebellum. lmn.. . 
Optic chiasma. lob. olf. . 
Degenerating carti- lob. opt. (dx., s.) . 
lage cells. 
Commissura _hori- mb. ach. 
zontalis. 
Geniculate body. ms’eth. . 
Meckel’s cartilage nid. ctx. 
(right, left). 
Antorbital cartilage. nid. rot. 
Rays of dorsal fin. 
Ect-ethmoid or pre- 
frontal (right, 
left). 
Ethmoid. 
Diagrammatic rep- 
resentation of the 
pseudomesial bar 
formed by the 
union of ect-eth- 
moid and pre- 
frontal. 
Foramen for olfac- 
tory nerve (right, 
left). 
Olfactory pit (right, 
left). 
n. opt. (dx., Ss.) 
ob. inf. . 
obl. inf. (dx., s.) . 
obl. su. . 
ob. sv. 
oc. mig. 
Pi 
pall. . 
pa’sph. . 
pia . 
pin. an. 
pins Ge: 
pincpl. 4s 
Pineal gland. 
Ganglion habenula. 
Ethmoid hook in 
mid-line over me- 
sial cartilage arch. 
Hyomandibular. 
Ethmoid notch 
(right, left). 
Lemniscus (fillet). 
Olfactory lobe. 
Optic lobe (right, 
left). 
Arachnoid mem- 
brane. 
Mesethmoid. 
Nidulus __corticalis 
(Fritsch). 
Nidulus rotundus. 
Optic nerve, right, 
left). 
See obl. inf. 
Inferior oblique 
muscle (right, 
left). 
Superior 
muscle. 
See obl su. 
Migrating eye. 
Posterior. 
Pallium. 
Parasphenoid. 
Pia mater. 
Anal or ventral fin. 
Dorsal fin. 
Pelvic fin. 
oblique 
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