78 



Fig. 40. On of the tentacles strongly magnified. 



— 41. A piece of the same, shewing the elongated conical side-papillse. 



— 42. The animal seen from the right side, the mantle being partly removed to shew the 



underlying parts, d, the foot; t.t, the tentacles; x.x, the conical papillae ; e, the gill. 



— 43. The exterior part of the gill strongly magnified. 



PI. IV. 

 Fig. 1—11. Gonieolis typica. 

 Fig. 1. A specimen seen from above, about 4 times magnified, a. a, the dorsal tentacles; 

 h, the velum; c. c, the labial tentacles; d, the proboscis; e, the penis. 



— 2. The same specimen seen from the right side, f, the anus ; the other letters as 



in fig. 1. 



— 3. Some of the dorsal papillae (the gills) strongly magnified. 



— 3. The jaw and soft parts adjacent seen from the left side, a, the tongue; 6, the sub- 



sidiary bucal cavity. 



— 5. The left jaw seen from the outer side. 



— 6. The right jaw seen from the inner side.. 



— 7. The tongue with the rasp-plate, seen from the side (reversed position). 



— 8. The tongue seen from the upper edge. 



— 9. A piece of the rasp-plate with the 3 rows of teeth. 



— 10. A piece of the middle row of teeth; side view. 



— 11. Some of the middle teeth isolated and in dift'erent positions. 



Fig. 12—18. Umbellisyllis fasciata. 



Fig. 12. A specimen seen from above, about 3 times magnified. 



— 13. The head and the anterior part of the body seen from above, more strongly mag- 



nified, a, the semi-lunar membrane. 



— 14. The same ; front view, a, as in the preceding figure. 



— 15. A piece of the body in the middle, shewing the peculiar dark transverse bands 



interrupted in the medial line. 



— 16. Section of one of the middle segments. 



— 17. The posterior end of the body, seen from above. 



— 18. One of the pedal bristles, strongly magnified. 



Fig. 19—35. Paraniphinome pulchella. 



Fig. 19. A spirit specimen viewed from the right side, magnified about 10 times. 



— 20. The anterior part of the body of the same specimen seen from above, more strongly 



magnified, a, the evaginated gullet or proboscis; h. b, the two strong chitine hooks 

 attached to the first segment; c. e, the anterior gills. 



