. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. from the rest by their shape, which is styli- form, and their structure, which is tubular, being composed of two horny laminae convo- luted one upon another, the first including the second. But direct observation has de- prived them of all claim to be considered as fulfilling any office of so much consequence in the economy of the Crustacea as that of con- veying the fecundating fluid from the body of the male into that of the female. At the most, they can only be regarded as organs of excita- tion, and which the animal
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. from the rest by their shape, which is styli- form, and their structure, which is tubular, being composed of two horny laminae convo- luted one upon another, the first including the second. But direct observation has de- prived them of all claim to be considered as fulfilling any office of so much consequence in the economy of the Crustacea as that of con- veying the fecundating fluid from the body of the male into that of the female. At the most, they can only be regarded as organs of excita- tion, and which the animal may perhaps em- ploy at the same time to guide the male into the female organ. The female reproductive apparatus of the Crustacea, in its highest state of complication, consists of an ovary, an oviduct, and copulatory pouches. Fig. Female organs of the Maja Squinado. The ovaries in the Decapoda brachyura resem- ble four cylindrical tubes («, b,Jig. 434) placed longitudinally in the thorax, and divided into two° symmetrical pairs, each opening into a distinct oviduct, yet communicating with one another by a transverse canal («'), and by the intimate union of the two posterior tubes in a portion of their length (//). The ovi- ducts, ns well as the ovaries, are of a whitish colour; they are short, and become united in their course to a kind of sac (c), the neck of which extends to the exterior of the ani- mal's body (of); there is one of these on each side, and they are known by the name of the copulatory pouches. It is into these reser- voirs that the male pours the fecundating fluid, which is here stored up and applied to the ova as they pass in succession along and out of the oviducts. These after a course, which is never long, terminate at the vulvse, openings formed in the sternal pieces of the segment which supports the third pair of ambulatory extremities. The Anomoura and Macroura have no copu- latory pouches, and their vulvse are situated on the basilar joint of
Size: 1405px × 1779px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
