. An introduction to zoology, with directions for practical work (invertebrates). XII CRUSTACEA 159 are much fused in the thoracic region, though still distin- guishable. The carapace is thought to correspond to thirteen. Fig. 95.—The Common Prawn (appendages of one side only shown). (1/1^1, First antenna; amig, aecond antenna; mxp^, third "jaw foot"; \ to ^5, five " walliing legs " ; S, swimmerets. segments, and thirteen pairs of appendages spring from below it. Attached to the soft cuticle between the ventral o^Liml^*^ and lateral portions of the exo-skeleton are the limb
. An introduction to zoology, with directions for practical work (invertebrates). XII CRUSTACEA 159 are much fused in the thoracic region, though still distin- guishable. The carapace is thought to correspond to thirteen. Fig. 95.—The Common Prawn (appendages of one side only shown). (1/1^1, First antenna; amig, aecond antenna; mxp^, third "jaw foot"; \ to ^5, five " walliing legs " ; S, swimmerets. segments, and thirteen pairs of appendages spring from below it. Attached to the soft cuticle between the ventral o^Liml^*^ and lateral portions of the exo-skeleton are the limbs or appendages, one pair to each segipent; these are much modified in different regions of the body to suit the function they have to perform (Fig. 96). The head region of the carapace is separated from the thoracic region by a transverse groove on the back; it beais, besides the stalked eyes, two pairs of long feelers or antennae. Surrounding the mouth, which lies right below the head, are also the modified appendages known as the "; These consist here of one pair of hard biting jaws or mandibles, and two pairs of leaf-like " soft jaws" or maxillae, which perhaps help in the subdivision of the food before it enters the mouth. These first five pairs of appendages belong to the five segments of which the head is thought to be formed. The first three pairs of thoracic legs are turned forward, and they also lie on the lateral borders of the mouth; they aid in passing the food into the mouth, and are therefore termed "jaw feet" (maxillipedes). The first two pairs of these jaw feet are much modified, and their basal joints aid in the division of the food, but the last pair far more closely resembles the remaining legs of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the ori
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1913
