Text book of Comparative Anatomy volume 2
Text book of Comparative Anatomy volume 2
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The copulatory apparatus of the Gastropoda, and the penis which projects into the mantle cavity in certain Cephalopoda have already been described.
One of the most remarkable and enigmatical phenomena in connection with the Cephalopoda is their hectocotylisation. This consists in the transformation of one of the oral arms of the male into a copulatory organ and spermatophore-carrier. This arm is said to be hectocotylised ; during copulation it becomes detached, and finds its way into the mantle... cavity of the female.
Typical hectocotylisation (Fig. 200) is found only in the Octopodan genera Argonauta, Philonexis, and Tremoctopus. In Tremoctopus and Philonexis (Parasira) the third arm on the right is the one transformed, in Argonauta the third on the left. The arm is at first enclosed in an outwardly pigmented sac (Fig. 200 A), when this bursts, the arm becomes free, and then its special form can be recognised (B). The folds which formed the sac bend back so as to form a new sac, which receives the spermatophores and is now inwardly pigmented.
What to read after Text book of Comparative Anatomy volume 2?
You can find similar books in the "Read Also" column, or choose other free books by Arnold Lang to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The copulatory apparatus of the Gastropoda, and the penis which projects into the mantle cavity in certain Cephalopoda have already been described.
One of the most remarkable and enigmatical phenomena in connection with the Cephalopoda is their hectocotylisation. This consists in the transformation of one of the oral arms of the male into a copulatory organ and spermatophore-carrier. This arm is said to be hectocotylised ; during copulation it becomes detached, and finds its way into the mantle... cavity of the female.
Typical hectocotylisation (Fig. 200) is found only in the Octopodan genera Argonauta, Philonexis, and Tremoctopus. In Tremoctopus and Philonexis (Parasira) the third arm on the right is the one transformed, in Argonauta the third on the left. The arm is at first enclosed in an outwardly pigmented sac (Fig. 200 A), when this bursts, the arm becomes free, and then its special form can be recognised (B). The folds which formed the sac bend back so as to form a new sac, which receives the spermatophores and is now inwardly pigmented.
What to read after Text book of Comparative Anatomy volume 2?
You can find similar books in the "Read Also" column, or choose other free books by Arnold Lang to read onlineMoreLess
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