III PODOPLEA—-AMPHARTHRANDRIA 67 
Ascidiella scabra at Concarneau), in which the female has lost 
its segmentation, the mouth-parts and thoracic legs being purely 
prehensile, and various species of Hnterocola, 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-form (Fig. 34). We 
Ant.1. = 
Fig. 34.—Hnterocola fulgens. A. Ventral view 
Of eG. x Sol; -By side! view, of <6); x<~ 106. : : 
Abd.1, 1st abdominal segment ; Ant.7, Ant.2, Fig. 35.—Asterocheres DES g, 
Ist and 2nd antennae; em, gland-cells; x, with egg-sacs, x 9/, (After 
ventral nerve-cord ; og, oviducal gland ; ov, ovary ; Giesbrecht. ) 
po, vagina; Th.1, 1st thoracic appendage ; Th. 4, 
Th.5, 4th and 5th thoracic segments. (After 
Canu.) 
have here the first instance of the remarkable parallelism between 
the degree of parasitism and the degree of sexual dimorphism, a 
parallelism which holds with 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 
swimming actively, and are very little modified in outward 
appearance by their parasitic mode of life (Fig. 35), though they 
1 Giesbrecht, Fauna and Flora G. v. Neapel, Monogr. 25, 1899. 
