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 Arhynchus hemignat/ii. Each x 20. 



The division of the body into three regions is well marked. The details are shown in Fig. 11. 



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. 

 Fig. 17. .\ surface view of the external opening of the genital duct, x 40. 

 Fig. 18. Some developing ova, highly magnified. 

 Fig. 19. 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 jxirt 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, lat. 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. 



