. The elasmobranch fishes . Fig. 263. The Waite.) A B shell of Heterodontus. A. E. francisci (orig.). B. H. gal eat us. (From crowding of the unusually large valvular intestine. In the adult the oviduct is divided into several functional sections which may now be discussed. The oviducal funnel or the opening into the body cavity is formed as a common aperture for the two oviducts (fl., fig. 251a). This is slit-like and is lined with ciliated cells, the cilia of which may have something to do with directing the eggs into the oviduct after they have reached the body cavity from the ovary. Just b
. The elasmobranch fishes . Fig. 263. The Waite.) A B shell of Heterodontus. A. E. francisci (orig.). B. H. gal eat us. (From crowding of the unusually large valvular intestine. In the adult the oviduct is divided into several functional sections which may now be discussed. The oviducal funnel or the opening into the body cavity is formed as a common aperture for the two oviducts (fl., fig. 251a). This is slit-like and is lined with ciliated cells, the cilia of which may have something to do with directing the eggs into the oviduct after they have reached the body cavity from the ovary. Just below the funnel, in the part comparable to the fallopian tube of higher forms, fertilization of the mature egg takes place. The egg then passes downward to the area of the shell gland, where such exists, to receive its shell. SHELL GLANDS The shell glands (, fig. 253a) vary greatly in the different Elasmobranchs. In Torpedo there are present in this region of the oviduct only a few strands of granular tissue, which are incapable of producing a shell. In a type like
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