Ill 



PODOPLEA AMPHARTHRANDRIA 



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 Enterocola, parasitic iu the 

 stomach of Compound Ascidians, in which the female is a mere 

 sac incapable of free motion, while the male preserves its swim- 

 and a general Cyclops-form (Fig. 34). We 



ming powers 



Ant 7, 



B 



///////// .v. A, Ventral view 

 35; B, side view of <J , x 106. 

 1st alxlnmiiiiil segment ; J ///./, .I///..', 

 l^t and tind antennae ; r.m, gland-cells ; n, 

 ventral nerve-cord ; <"/, ovidueal gland ; r, ovai-v ; 

 /'", vagina; 7V/./, 1st tlioi'.-u'ii; appendage; Tli.,'/, 

 7V/., -7, 4th and 5th thoracic segments. (After 

 Canu.) 



FIG. ?>5. Asteroche.fi as, 9 . 



"with egg - sacs, x 57. (Altii 

 i. 



have here lln- first, instiincc of the nMiiarkalilr ]i;M';il]i-lism 

 the degree of ]arasit,isiii and tin; degree of sexual dimurphisni, a 

 paralleHsm which holds \vii.h great, regularity among tin-. Cope 

 poda, and can be also extended to other classes nf jiarasit ic animals. 

 Fam. 6. Asterocheridae. 1 - -These forms retain the power of 

 swimming actively, and are very little modified in oiihvard 

 appearance by their parasitic mode of life (Fig. 35), though they 

 1 Oicsbrcclit, /.'//////// ////// _!'!,, r C. v. .\<ai)d, Mono^r. '2~>, 1899. 



