Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAEACTERS OF FAMILIES. 1. Calanid.®.—Body elongated; abdomen distinct from thorax; anterior antennae long, 24- or 25-jointed, that of the male, on the right side only, partially thickened and geniculated; posterior antennae large, and usually 2-branched; mandible-palp usually 2-branched. Both pairs of foot-jaws large and well developed, many jointed, marginally setiferous. First four pairs of feet 2-branched, outer branches 3-jointed ; fifth pair similar to the foregoing pairs, or much modified (especially in the male) and unlike on the two sides. Ovisac single. 2. MisopHKilDjE.—Like Calanidie, but that the anterior antennae are composed only of 7—18 joints, and are much shorter than the cephalo- thorax; robust, and in general build decidedly cyclopoid. 3. Cyclopid:.—Cephalothorax ovate and usually much more robust than the abdomen; anterior antennas seldom longer than the cephalo- thorax; those of the male alike on both sides and modified for the purpose of clasping; posterior antennae unbranched. Palps of mandibles and maxillse usually well-developed. Foot-jaws mostly less developed than in Calanida. First four pairs of feet as in Calanidte ; fifth pair rudimentary, alike in both sexes, and usually 1-jointed. Ovisacs two. 4. Notodelphyid.s:.—Fourth and fifth body-segments of the female usually coalescent, swollen dorsally to form a matrix or covering for the ova after their passage from the ovarium. Anterior antennae short, 5—15-jointed; posterior unbranched, 3-jointed. Mandible-palp 2- branched. Foot-jaws and swimming-feet like those of Cyclopidce. Fifth pair of feet rudimentary or altogether absent. No external ovisac. 5. Buprobid.s;.—Body pouch-like, not distinctly segmented. An- tennse rudimentary, anterior 2- or 3-, posterior 1- or 2-jointed. No mandible-pal...