A monograph of the free and semi-parasitic Copepoda of the British Islands (Volume 3)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880. Excerpt: ... 1. Lichomolgus Fucicolus, Brady. PL LXXXV, figs. 1--11. Macrocheiron fucicolum, Brady. Nat. Hist. Trans. Northumber-land and Durham, vol. iv, p. 434, pi. xviii, figs. 9--18 (1872). Lichomolgus fucicolus, Brady & Robertson. Ann. and Mag. Nat. Hist., ser. 4, vol. xii, p. 140 (1873). Body elongated, first segment equal to more than half the length of the cephalothorax, which tapers gradually to its last joint; the abdomen in both sexes is composed of five joints (figs. 1, 10), but in the male the first joint has its lower angles produced into two short sharp spines, and is much enlarged both in length and breadth, being as long as the rest of the abdomen, including the caudal segments; in the female the first abdominal segment is formed by the union, often imperfect, of the first and second somites (the line of separation between the two being quite visible in immature specimens), and, like that of the male, is about equal in length to the remaining half of the abdomen, the angles of the true first somite at the line of junction being, however, smoothly rounded off. Rostrum short and sharp; anterior antenna (fig. 2) slender, 7-jointed, nearly as long as the first body segment, second, fourth, and fifth joints longer than the rest, third joint shortest; the whole limb beset at the apex and on the outer margin with rather short slender hairs. Posterior antenna (fig. 3) 3-jointed, bearing a few short marginal seise, and at the apex of the third joint four long rigid setae and a large falciform claw, which is denticulated on its inner margin, and equal to half the length of the antenna. The mandible (fig. 4 a) is small, pyriform, dilated at the base, and produced into a long stiletshaped extremity, which is ciliated on both margins; the maxilla (fig. 4 b) forms ...