. The Cambridge natural history. Zoology. POUOPLEA AMPHARTHRANDRIA 67 Ascidiella scahra at Concarneau), in which the female has lost its segmentation, the mouth-parts and thoracic legs being purely prehensile, and various species of JiJnterocoIa, parasitic in the stomach of Compound Ascidians, in which the female is a mere sac incapable of free motion, while the male preserves its swim- ming powers and a general Cyclops-iavm. (Fig. 34). We. "IG. 34.—Enterocoht falliens. A, Ventral view •if 9, X 35; B, .side view of cJ, x 106. , 1st alxloiiiiiial segment ; , , 1st and 2nd a
. The Cambridge natural history. Zoology. POUOPLEA AMPHARTHRANDRIA 67 Ascidiella scahra at Concarneau), in which the female has lost its segmentation, the mouth-parts and thoracic legs being purely prehensile, and various species of JiJnterocoIa, parasitic in the stomach of Compound Ascidians, in which the female is a mere sac incapable of free motion, while the male preserves its swim- ming powers and a general Cyclops-iavm. (Fig. 34). We. "IG. 34.—Enterocoht falliens. A, Ventral view •if 9, X 35; B, .side view of cJ, x 106. , 1st alxloiiiiiial segment ; , , 1st and 2nd antennae ; cm, gland-cells ; n, ventral nerve-cord ; o[/, oviducal gland ; ov, ovary ; /'", vagina; , 1st thoracic appendage; , , 4th and 5th thoracic segments. (After Canu.) Fig. 35.—Asterocheres violaceus, 9 , with egg-sacs, x 57. (After Giesbrecht.) have here the first instance of tlie lemarkable parallelism between the degree of p;i,rasitism and the degree of sexual dimorphism, a parallelism which liolds witli great regularity among the Cope- poda, and can be also extended to other classes of parasitic animals. Fam. 6. Asterocheridae.^—These forms retain the power of swinniiing actively, and are very little modified in outward appearance by their parasitic mode of life (Fig. 35), though they ^ (iiesbrecht, Fauna and Flvra G. v. Ncapel, Monogr. 25, 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 Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. London : Macmillan and Co. ; New York : The Macmillan Company
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