Mr. H.J. Carter un Ploesconia and Kerona. 257 



EXPLANATION OF PLATE VL 



Fig. \. Ploesconia truncata, Ehr., filled with embrjonic cells, lateral view, 

 right side : a, anterior wreath of cilia resting on prolonged under 

 lip ; h, anterior legs ; c, gill ; d, posterior legs, cleft. 



Fig. 2. Ditto, dorsal view. Here the gill, together with parts of the legs 

 and the contracting vesicle, are faintly seen through the other 

 parts : a, under hp ; b, contracting vesicle and anal orifice. 



Fig. 3. Ditto, ventral view, without embryonic cells, but presenting algal 

 cells and hepatic globules in the abdominal cavity, — the former 

 indicated by their oval form, large size, and dark colour (having 

 been taken in for food), and the latter by being colourless and 

 circular ; these, together with the sarcode, form the contents of 

 the abdominal cavity : a, triangular depression leading to b, the 

 oral orifice, through which an algal cell is represented in the act 

 of being conveyed into the abdominal cavity ; c, contracting 

 vesicle and anal orifice. 



Fig. 4. Ditto, dorsal view, unshaded; chiefly to show the form and posi- 

 tion of the nucleus : a, posterior legs ; b, anterior legs, of which 

 c are the two largest ; d, posterior short legs on the right side, 

 cleft ; e, ditto on the left side, styliform ; /, anterior wreath of 

 cilia resting on g, the lower lip ; h, gill ; i, triangular depression 

 leading to k, oral orifice ; I, nucleus ; m, contracting vesicle ; 

 n, longitudinal lines, apparently on the ventral surface. 



Fig. 5. Kerona pusiulata, lateral view, right side ; abdominal cavity 

 charged with digestive spaces and hepatic globules, — the former 

 containing food, which is indicated by the dark shade, and the 

 latter being colourless and circular : a, anterior wreath of cilia 

 resting on lower lip ; b, anterior legs ; c, gill ; d, contracting 

 vesicle ; e, marginal cilia ; /, posterior legs. 



Fig. 6. Ditto, dorsal view : a, anterior wreath of cilia resting on b, lower 

 lip ; c, digestive spaces ; d, hepatic globules ; e, dark angular 

 grains ; /, nucleus ; g, anal orifice. 



Fig. /. Ditto, ventral view : a, anterior legs; b, posterior legs; c, gill; 

 d, triangular depression leading to e, oral orifice, in which is an 

 algal cell ; /, contracting vesicle ; g, nucleus ; h, anal orifice. 



Fig. 8. Ditto, shortened preparatory to encapsulation : a, contracting 

 vesicle ; b, hepatic globules ; c, dark angular grains. 



Fig. 9. Ditto, ditto, further advanced : a, contracting vesicle ; d, dark an- 

 gvdar grains. 



Fig. 10. Ditto, encapsuled : a, capsule ; b, spherical cell filled with d, 

 minute globular bodies, apparently of an oleaginous composition ; 

 c, contracting vesicle ; e, dark angular grains. 



Fig. 11. Ditto, empty capsule of: «, with ragged external part absent; 

 h, spherical cell, empty, ruptured ; c, dark angular grains. 



Fig. 12. Ploesconia CAaro?j, lateral view, right side ; abdominal cavity with- 

 out food, but presenting hepatic globules : a, anterior wreath of 

 ciUa resting on lower lip ; h, anterior legs ; c, gill ; d, posterior legs. 



Fig. 1 3. Ditto, posterior view, showing the form of the dorsal ridges. 



Fig. 14. Ditto, dorsal view: a, granulated ridges; b, wreatli of cilia rest- 

 ing on c, under lip ; d, digestive spaces containing fragments of 

 food ; e, contracting vesicle and anal orifice ; /, the part which is 

 sometimes much expanded. 



Fig. 15. Ditto, ventral view : a, anterior legs; b, posterior ditto ; cc, short 

 legs ; d, triangular depression leading to e, oral orifice, in which 

 there is an algal cell to show its position ; /, gill ; g, contracting 

 vesicle and anal orifice. 

 Ann. S^Mag. N. Hist. Ser. 3. Vol. iii. 17 



