. The elasmobranch fishes . Fig. 122. Section through thymus gland of 63 mm. embryo Heptanchus cinereus. (From Van Wijhe.) d., duct of thymus; e., epithelial body; lim., hyomandibular cartilage; oi., otic area; p-q., palatoquadrate cartilage; //(., thymus nodules; //, second gill cleft. The stomach of Heptanchus is U- shaped, the larger left limb being the cardiac end (\, fig. 120), and the smaller right limb, the pyloric division (). Superficially the cardiac por- tion of the stomach appears as a more or less distended bag. while the pyloric division is thick-walled. Within the cardia
. The elasmobranch fishes . Fig. 122. Section through thymus gland of 63 mm. embryo Heptanchus cinereus. (From Van Wijhe.) d., duct of thymus; e., epithelial body; lim., hyomandibular cartilage; oi., otic area; p-q., palatoquadrate cartilage; //(., thymus nodules; //, second gill cleft. The stomach of Heptanchus is U- shaped, the larger left limb being the cardiac end (\, fig. 120), and the smaller right limb, the pyloric division (). Superficially the cardiac por- tion of the stomach appears as a more or less distended bag. while the pyloric division is thick-walled. Within the cardiac stomach is usually found a consid- erable amount of undigested food material in the form of pieces of fishes, the shell and claws of crabs, and the like. Internally the pronounced folds of the cardiac stomach continue in a more or less longitudinal direction from its union with the oesophagus throughout two-thirds of its length where they become more or less tortuous. At the distal end of this part of the stomach there is present a blind sac in which some of the folds terminate. Some of the small folds abut against a circular fold which in a way separates the cardiac from the pyloric division. The pyloric lumen of the stomach is long and narrow, and its folds are not especially marked at the proximal end. As the terminus of the pylorus is reached, however, they become much higher. Three-fourths of an inch from the termination of the pyloric linil) there is a slightly enlarged portion which opens into the duod- enum through the pyloric valve.
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