. A text-book of invertebrate morphology. Invertebrates. TTPB CRUSTAOEA. 407 Brancliise are present in Mysis only in the form of small epipodial elevations of the thoracic appendages, and in Siridla as coiled tubular structures on the protopodites of the abdom- inal appendages of the males. In Euphausia, however, they form large ramified bunches attached to the protopodites of the thoracic limbs and are present even on the rudiments of the seventh and eighth pairs; they are not, however, enclosed. Fig. 1S4, —Mysu relicta (after Saks). bp = brood-pouch. ot = otocyst. within a chamber formed by
. A text-book of invertebrate morphology. Invertebrates. TTPB CRUSTAOEA. 407 Brancliise are present in Mysis only in the form of small epipodial elevations of the thoracic appendages, and in Siridla as coiled tubular structures on the protopodites of the abdom- inal appendages of the males. In Euphausia, however, they form large ramified bunches attached to the protopodites of the thoracic limbs and are present even on the rudiments of the seventh and eighth pairs; they are not, however, enclosed. Fig. 1S4, —Mysu relicta (after Saks). bp = brood-pouch. ot = otocyst. within a chamber formed by the lateral portions of the cara- pace, but project freely to the exterior. Otocysts occur in the inner lamellae of the sixth abdominal appendages (Fig. 184, ot), and in Euphausia a number of eye- like phosphorescent organs occur on the basal joints of the second and seventh thoracic appendages as well as upon the ventral surface of the four anterior abdominal segments. They are spherical in shape and each consists of a cup of cells containing red pigment covered in by a lens. The Schizopoda are essentially marine, though some species of the genus Mysis (Fig. 184) occur in fresh and brackish water. 2. Order Cumacea. In this order the carapace covers only the anterior three or four thoracic segments, five or four of them remaining dis- tinct. The antennules are short and in the male biramous, while the antennae, though in the female almost rudimentary, may be as long as the entire body. The two anterior thoracic appendages form maxillipeds, their basal joints serving for mastication while the succeeding six pairs are limblike, all but the last or three last possessing small exopodites. 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 original McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt
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