100 ON A NEW SPECIES OF ENTEROPNEUSTA. 



Fig. 1. Ptychodera peharti, n. sp. X 2. 



Fig. 2. Sagittal section through proboscis and collar of Ft. peharti. The lines marked I, 



II, III, IV, V, and VI indicate the planes of the sections illustrated in the 



following figures. X 40. 

 Fig. 3. Transverse section through tip of glomerulus distal to stomochord. X 60. 

 Fig. 4. T. S. central complex of proboscis, x 54. 

 Fig. 5. T. S. stomochord, pericardium, and portions of proboscis integument. Plane of 



section, line I in fig. 2. X 60. 

 Fig. 6. T. S. stomochord, nuchal skeleton, and "racemose" organ. Plane of section, 



line III in fig. 2. x 100. 

 Fig. 7. T. S. stomochord and skeleton, x 80. 



Fig. 8. T. S. proboscis neck. Plane of section, line IV in fig. 2. x 64. 

 Fig. 9. Horizontal section through plane indicated by curved line V in fig. 2, and showing 



condition of proboscis poies and dorsal coelomic canals on both sides. X 60. 

 Fig. 10. T. S. collar. Plane of section, line VI in fig. 2. x 20. 

 Fig. 11. T. S. through branchio-geuital region. X 50. 

 Fig. 12. Ventral portion of transverse section through caudal region, showing pygochord. 



X 140. 



