as not seen.

Lying between the anterior end of the duodenum and the posterior end of
the stomach, and extending caudad for 10 to 15 mm., in the median plane
of the animal is the pancreas, _pan_. It is a long narrow body of a
whitish color; its duct or ducts could not be determined by dissection.
The duodenum extends caudad, with gradually diminishing caliber, from
the enlarged region mentioned above. About 10 to 15 mm. caudad to the
stomach it makes a sort of double loop to the right, a wide loop, _lp_,
and a close one, _lp'_, nearer the median plane. From the latter loop
the intestine extends straight to the left, for a distance of about 10
mm., where it makes a small loop cephalad, _lp^2_, and then opens to the
yolk-sac, _y_. The yolk-sac is shown here simply as an irregular piece
of tissue, the yolk having been removed.

The anterior intestinal portal, _aip_, and posterior intestinal portal,
_pip_, are in close proximity with each other.

From the posterior intestinal portal the intestine extends straight
cephalad to the posterior end of the stomach, dorsal to which it forms a
double loop, a wider one, _lp^3_, and a narrow one, _lp^4_. From the
latter loop, _lp^4_, the intestine extends straight caudad, parallel and
near to the straight region leading from the posterior intestinal
portal, until it reaches the region of the loop _lp^2_, dorsal to which
it forms a small loop, _lp^5_. From loop _lp^5_ the intestine, which is
here of very small caliber, extends caudad for about 10 mm., where it
forms another indistinctly double loop, _lp^6_.

From loop _lp^6_ the large intestine, _il_, extends, with gradually
increasing caliber, to the cloaca, _cl_, a distance of 10 to 15 mm.

Except in the enlarged region near the pylorus the lumen of the
intestine is almost obliterated by the folding of its thick walls, so
that little or nothing can be told of its lining with the naked eye.

A distinct mesentery holds the loops of the intestine in position and
binds the entire enteron close to the dorsal body wall. Because of the
lack of properly fixed tissue no sections of the enteron of this stage
were made.

REFERENCES

1. BRONN, H. G.: Klassen des Thier-Reichs. (Vols. on reptiles.) 1890.

2. CHAFFANJON, V.: Observations sur Alligator mississippiensis (Tractus
intestinalis und Mesenterium). Ann. Soc. Linn. Lyon, vol. 28, p. 83 ff.,
1881.

3. EISLER, P.: Zur Kentniss der Histologie des Alligatormagens.
Archiv f.