16 W. T. CALMAN. 



PLATE 2. 



Fig. 12. — Interual view of dorsal portion of braiicliial sac, siiowing the 

 four rows of stigmata, the transverse vascular bars which cross them, the 

 unsym metrical position of the three dorsal languets, and the interserial 

 laniellaj with which these latter are connected. 



Fig. 13. — The oesophageal funnel and its connection with the endostyle. 



Fig. 14. — Semi-diagrammatic transverse section across the thorax at the 

 level of the cloacal opening, showing the proportions of the endostyle and the 

 relations of the dorsal sinus and the degenerate rudiment of the dorsal nerve- 

 cord. 



Fig. 15. — Transverse section through the constricted neck between thorax 

 and abdomen, showing the relations of oesophagus and intestine to vas 

 deferens and oviduct. 



Fig. 16. — Transverse section through upper portion of abdomen, showing 

 the stomach and intestine in relation to vas deferens and oviduct, and to the 

 heart, pericardium, and (?) epicardial tubes. 



Fig. 17. — Transverse section of an iaterstigmatic bar, showing the con- 

 tained blood-sinus, the characters of the ciliated epithelium on its lateral 

 edges, and of the flattened epithelium on its inner and outer sides. Zeiss, y^th 

 horn, imm., 2. 



Fig. 18. — Surface view of an interstigmatic bar. 



Fig. 19. — Transverse section of oesophagus, showing its folded walls and 

 columnar ciliated epithelium. 



Fig. 20. — Transverse section of endostyle, showing the epithelial charac- 

 ters of its lips, side walls, and central groove. Zeiss, E, 2. 



Fig. 21. — Ventral section of nerve ganglion and associated organs, showing 

 the buccal sphincter, the ganglion with origin of the cloacal nerve, the gland 

 of Julin, and the course of its duct. The long and well-preserved cilia in the 

 duct are all pointing inwards. Zeiss, E, 2. 



Fig. 22. — Transverse section of the dorsal branchial blood-sinus, showing 

 dorsally the rudimentary dorsal nerve-cord, and laterally, near the attacliment 

 of tlie sinus to the thoracic walls, its longitudinal muscular bands. E, 2. 



Fig. 23. — Longitudinal section of the abdomen, showing the valvular lip 

 of the oesophagus where it enters the stomach, and the entrance into the latter 

 organ of the duct of the intestinal gland. Some tubules of the testis are 

 again seen within the intestinal loop. 



Fig. 24. — Longitudinal section of part of the intestinal gland. The gland 

 is seen lying against the wall of the intestine, while its duct passes ofT in the 

 opposite direction towards the stomach. Zeiss, -j\^th horn, imni., 2. 



Fig. 25, — Gregarines from stomach. Zeiss, -J^th horn, imm., 2. 



