Plate 42. 



Tiara papua. 



Fig. 1. A very young individual, 2 mm. in diameter with long apical projection and 

 apical canal (cap). From life. 



Fig. 2. Side view of a specimen, 5 mm. in diameter, with horseshoe-shaped gonads (go) 

 well developed. The tentacles are all broken short oft'; (pr.ap) apical pro- 

 jection ; (1) lip ; (t.ra) radial tentacle ; (era) radial canal. From a pho- 

 tograph. 



Fig. 3. Quadrant of bell margin of a slightly older specimen, 7 mm. high by 5 mm. in 

 diameter ; (o) ocelli ; (c.c) circular canal. 



Fig. 4. Oral view of the same specimen, showing either one or two tentacles and 

 from two to four rudimentary tentacles between every two radial canals (era) ; 

 (o) ocellus. 



Turns fontata, sp. nov., type. 



Fig. 5. Distal portion of radial canal (era), showing lateral glandular diverticula 

 and bell margin; (c.c) circular canal ; (t.ra) radial tentacle; (o) ocellus. From 

 a photograph, x 5. 



Fig. (5. Portion of bell margin with marginal organs; (t 1 ) large tentacle- (t' 2 ' imma- 

 ture tentacle ; (o) ocellus ; (s) exuinbral sense pit. X 15. 



Fig. 7. Longitudinal section through base of large tentacle, showing tentacular ostium (os) 

 by which its cavity communicates with the exterior ; (l.vas) vascular endoderm 

 lamella; (ec) ectoderm ; (en) endoderm ; (v) velum. X 30. 



Fig. 8. Side view of base of tentacle; (g) jelly; (s) exumbral sense pit; (c.c) lumen of 

 circular canal ; (v) velum. From a photograph, x 15. 



Fig. 9. Side view of margin of bell, and exumbral sense pit (s); (t) base of 

 tentacle, x 100. 



Fig. 10. Section through margin of bell and sense pit; (ec) ectodermic lining of sense 

 pit, with bristle cells, x 150. 



I i ■. 11. Exumbral view of tentacle base, ami sense pit (s) ; (os) tentacular ostium, x '20. 



