North American Parasitic Copepods Belonging to the Family Ergasilid

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...in the fully developed adult the process is wanting and there is but a single spine. The arrangement of spines and setse on the first four pairs of legs is as follows: First exopod, I-0; 0-1; II-5: endopod, 0-1; 0-1; II-4: second exopod, I-0; 0-1; 0-6: endopod, 0-1; 0-2; I-4: third exopod, I-0; 0-1; 0-6: endopod, I-O; 0-2; 0-5: fourth exopod, 0-0; I-0; 0-4: endopod, 0-1; 0-2; 0-4. The anatomy of the muscular, digestive, and reproductive organs of this species have been described on pages 285 to 302; the nauplius and two metanauplius stages of development were described and figured under the ontogeny of the Ergasilinae, pages 319 to 326'. Body a clear cartilage color, translucent in young females, but becoming dense and opaque in the adults; ovaries and testes an opaque white. Eggs also an opaque white when freshly extruded, acquiring blue pigment gradually upon development, until when ready to hatch the entire egg-sacks appear blue to the naked eye. Total length, 0.8 to 0.9 mm. Length of cephalothorax in adult, 0.66 mm. Width of same, 0.58 mm. Length of egg sacks, 0.9 mm. In young females with their first egg-sacks the body is relatively longer and narrower, and the proportion between the length of the cephalothorax and the remainder of the body is as 11 to 8 (see fig. 21). (centrarchidarum, of or belonging to the Centrarchidse, the family of fish upon whose gills this parasite is found.) The red eye (Ambloplites rupestris) is the most common host of this parasite, and nearly every one of them which the author has examined has been found infested to some extent. During the summer of 1906 quite a number of red eyes were examined at Lake Maxinkuckee, Indiana, for the purpose of ascertaining their food and the kinds of parasites which...