. The elasmobranch fishes . CLOACA Fig. 124. Sagittal section through rectal gland, Hep- tanchus. (From Howes.) CO., colon; fd., fold of spi- ral intestine; lu., lumen of The rectum empties into an enlarged room, the gland; re, rectum. , i • i • t -, ^.^ ,i cloaca, which is lined with a smooth mucous mem- brane (see fig. 252, facing p. 290). Into the anterior part of the cloaca empty the products from the digestive, the urinary, and the genital systems, and in its posterior part are two finger-like processes, the cloacal papillae (p.). ABDOMINAL PORES (POEIABDOMINALES) As a usual thing the clo
. The elasmobranch fishes . CLOACA Fig. 124. Sagittal section through rectal gland, Hep- tanchus. (From Howes.) CO., colon; fd., fold of spi- ral intestine; lu., lumen of The rectum empties into an enlarged room, the gland; re, rectum. , i • i • t -, ^.^ ,i cloaca, which is lined with a smooth mucous mem- brane (see fig. 252, facing p. 290). Into the anterior part of the cloaca empty the products from the digestive, the urinary, and the genital systems, and in its posterior part are two finger-like processes, the cloacal papillae (p.). ABDOMINAL PORES (POEIABDOMINALES) As a usual thing the cloacal papillae in Heptanchus are imperforate. Occa- sionally, however, as on the left side in figure 252, they are perforate, forming the so-called pori abdominales. These pores connect the abdominal cavity or coelom with the exterior.
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