446 SCHULTE, SEI WHALE. 



angle with the greater curvature of the second compartment. From this angle a shallow furrow 

 ascends upon the venter of the stomach towards the apex to the level of the communication 

 between the first two compartments. A rather deep cleft is present dorsally in a correspond- 

 ing position; it is filled with areolar tissue and in it the gastric artery breaks up into its large 

 branches. Except for the actual region of communication, therefore, the first and second com- 

 partments are well demarcated ectally. Entally the orifice of the oesophagus is placed at the 

 junction of the upper and middle thirds. And here the folds of the dorsal wall are continued 

 into the oesophagus. At the sides, however, there is no radiation from the orifice, the longi- 

 tudinal folds passing it on the left with no disturbance of their pattern. This holds true of the 

 right side also in general, but here a prominent ridge arches round the opening, and this is crossed 

 by several shallow sulci which converge towards the ossophagus. They are confined to this 

 single ridge and produce no alteration in the other folds. The folds are somewhat tortuous, and 

 as the intervening sulci are narrow and deep, there is a distinct interlocking on the part of adja- 

 cent folds, which lends them the " cerebriform " appearance noted by Carte and MacAlister. 

 Under the binocular this surface has the same texture as that of the oesophagus. The greatest 

 length of this compartment from apex to fundus measures 21 mm.; its greatest breadth 6.5 mm. 



The junction of the first and second stomachs is marked by an abrupt change in the mucous 

 membrane, which has a softer, more succulent appearance in the second stomach. The char- 

 acter of the ridges changes also; ventrally the ridges of the first compartment simply subside, 

 dorsally they become tortuous and irregular, in marked contrast to the even longitudinal folds of 

 the second compartment. The line of junction is directed from the summit of the doubled wall, 

 where the two compartments are in apposition, to the left and rostrad, passing very slightly to 

 the left of the apex of the stomach. The orifice of communication has a nearly horizontal lower 

 lip formed by the summit of the wall just mentioned; the remainder of its contour is arched. 

 Vertically it measures 3 mm., transversely about 4 mm. 



The second compartment is larger than the first and diverges from it to the right. It 

 measures 24 mm. hi a straight line from the apex to the orifice of the third stomach, 13 mm. in 

 its region of greatest breadth. Its general shape is fusiform. The greater curvature is evenly 

 convex; the lesser, at first strongly convex to the right, becomes concave distad and assumes 

 a horizontal direction as the third stomach is approached. The walls are gently convex except 

 where applied to the first stomach. Here, immediately below the proximal orifice, there is a 

 slight bulging inwards of the left wall. The mucous membrane on the dorsal wall is thrown 

 into several longitudinal folds, in some places connected by lower transverse ridges. The folds 

 are best marked along the lesser curvature. A portion of the wall is smooth. The ventral 

 wall, on the other hand, is marked by transverse, forking folds, which radiate from the base of 

 the double wall which separates this compartment from the first. Farther distad are four 

 or five oblique rugae, running from the greater to the lesser curvature and converging towards the 

 third stomach. Evidently in this compartment the primitive longitudinal folds are in process 

 of being replaced by the transverse ones of the older foetus (Jungklaus) and adult (Perrin). The 

 surface of the mucosa is more delicate than that of the first compartment and appears finely 

 granular; under the binocular this appearance is found to be due to the presence of small arese 

 gastric^ separated by shallow sulci. 



The lower part of the second compartment adjacent to the greater curvature and leading 

 to the orifice of the third requires a more particular description. It is partially set off from the 



