ENTOZOIC COPEPOD FROM JAPAN. 229 
EXPLANATION OF PLATHS 21 & 22. 
Reference Letters. 
A=adult 9. B=adult §. C=immature 2. a'=iirst antenna. a?=second 
antenna. /'=first basal sezment. 6?=second basal segment. 6/.=beak. 
f=furea. g=genital pore. h=hooks, /./.=lower lip. /.v.=upper lip. 
md.= mandible. mp.'=first maxillipede. mp.?=second maxillipede. ma.= 
maxilla. #¢e.=nucleus. e@=cesophagus. pd.=pad. p=palp. s=sternal 
plate. 7¢h.'-°=thoracie legs 1-5. vc.=vacuole. «=curious glandular 
patch between Ist and 2nd abdominal segments in the adult male. 
Goidelia japonica. 
| Figs. 1-19 drawn with the camera lucida.| 
Fig. 1. Outline-drawings of :— 
A. Adult Q. B. Adult ¢. C. Immature 9. 
Superposed on a correspondingly magnified millimetre-scale, the 
divisions of which are to 1/10 mm. 
. Stage B of 1st maxillipede 2, drawn from the ventral face, and 
magnified considerably more than figs. 5 & 4. 
3. Adult male from the ventral side, showing the peculiar modification 
of the two basal abdominal segments. 
4. Dorsal view of young female. 
[Figs. 5, 6, 7, 8 all drawn on the same scale to show relative sizes. | 
5, First antenna. 
6. Second antenna, @, 
Liceul ” 3. 
8. Mandible showing terminal claw. 
9 Pe on an enlarged scale. 
10. Mouth-parts iv situ, showing the upper and lower lips, mandibles» 
and maxilla. 
Figs. 11, 12, 15, 14, 15.—Stages in the development of the first 
maxillipede 2 —all drawn on the same scale. 
11. Stage A, showing the undifferentiated condition. 
12. ,, 5B (ventral view). 
13. ,, B (dorsal view). 
14. ,, C, showing the new hooks folded up within. 
15. ,, OD, adult organ. 
16. First maxillipede ¢. 
17. Second maxillipede 4, immature stage with chelx undifferentiated : 
the first maxillipede is shown én situ. 
18. Second maxillipede 4, adult chelate form. 
19. One of the first four thoracic legs, showing its relative position to the 
sternal plate. 
Trichodina ? sp. 
Fig. 20., Zrichodina, showing the curious beaded nucleus in various positions, 
with the two circlets of cilia and the clear vacuole (contractile 
vacuole ?). 
