Éléments de l'anatomie comparée (1878) Éléments d'anatomie comparative elementsofcompar00gege Année : 1878 320 L'anatomie comparée, les deux flux d'eau d'entrer et de s'en échapper avec une plus grande régularité. Le moins de concrescence qui est observé, donne lieu à une plus grande, et une plus petite, l'orifice postérieur (Mytilidse). L'ancien sert d'exutoire pour le pied, et que l'orifice d'entrée pour l'alimentation, alors que le second, dans la correspondance avec sa position, est l'orifice de sortie pour l'fcecal, et de l'eau qui a servi de respi- ration. Dans le Chamacea)

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Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 320 COMPARATIVE ANATOMY, the two streams of water to enter and escape from it with greater regularity. The least amount of concrescence which is observed, gives rise to an anterior larger, and a posterior smaller, orifice (Mytilidse). The former serves as an outlet for the foot, and as the orifice of entrance for the food, while the latter, in correspondence with its position, is the orifice of exit for the fcecal matters, and of the water that has served for respi- ration. In the Chamacea) there are also two large openings behind the anterior and larger cleft, through which the foot is protruded, and which serve respectively for the entrance and exit of water; this is an arrangement which attains a higher grade of development in a large division of the Lamellibranchiata (Siphoniata). That part of the mantle which surrounds these orifices forms an elongated tube (siphon), which undergoes other modifications in addition to its con- crescence. The respiratory tubes may sometimes be formed by Fi° 168. Lateral view of the mantle-cavity of a Mactra; the right mantle-lamella has been removed. br br' Branchia?. t Tentacle, ta tr Siphons. mp Posterior adductor, p Foot, c Umbo. 5)ia Anterior, separate portions of the mantle; or there may be a respiratory tube, which is siuo-lo externally, and is only divided internally into two canals by a partition; or the two conditions may be combined (Fio 1G8, tr ta); or, finally, two completely separate tubes may be developed : an upper one, the inner orifice of which is opposite the anus, and serves for the exit of the water, and a lower one, by which the water passes in. The investment of cilia causes the two streams to pass regularly in and out. Through these forms we arc led up to those in which the respiratory cavity is most completely closed, and the pallial tubes most developed. This is accom- panied by a diminution in t

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