DESCRIPTION OF PLATE XIV. (VOL. II.) 



ENTOZOA. 



For explanation of letters see description of Plate XIII. 



Figs. II, 12, and 13. Three views of three different specimens of ArhyncJius hemigiiafki. Each x 20. 



The division of the body into three regions is well marked. The details are shown in Fig. 1 1. 



Figs. 12 and 13 are rough sketches. 

 Fig. 14. A transverse section through the head of a female, crowded with ova and egg-masses; the 



ligament is shown in section, x 40. 

 Fig. 15. A transverse section through the same, just below the edge of the collar. In the centre is the 



neck, which fuses with the collar a few sections further back. The big circular canal of the 



collar is shown at /., x 40. 

 Fig. 16. A transverse section through the trunk of the same. The uppermost lemniscus is cut in two 



places. The ovary is double, and shows egg-masses as well as eggs ; some coagulated 



masses of spermatozoa are lying in the body-cavity, x 40. 

 A surface view of the external opening of the genital duct, x 40. 

 Some developing ova, highly magnified. 

 A transverse section through the trunk near the genital pore, taken from the same series as 



Figs. 14, 15, and 16. It shows part of the funnel-shaped internal opening of the genital 



duct, g. d., X 40. 

 Fig. 20. A transverse section from another specimen taken behind the opening of the genital duct. 



This shows the arrangement of the lacunae and their communications with the lateral 



lacunae, /. /. 

 Fig. 21. A longitudinal section through the central part of the skin of the head, showing the origin of 



the ligament and the ganglion cells of the brain, lying in a mass of ova and egg-masses. 

 Fig. 22. A small portion of the skin in section, showing the single layer of circular muscle-fibres, x 40. 

 Fig. 23. A median longitudinal section through a female. The whole body-cavity full of ova and 



egg-masses. The ligament is seen in the head, and the genital duct near its opening in the 



trunk. The left lemniscus, cut twice, is alone seen, x 30. 

 Fig. 24. A transverse section through the trunk of a male, showing one of the testes. This section 



shows also the longitudinal muscles on the lemnisci and the large lateral lacunae. Inf. lac, 



X 40. 

 Fig. 25. A transverse section through the head of a male, showing the brain in the ligament, and the 



longitudinal muscle-fibres very well developed, x 40. 



