10 Pub. Puget Sound Bid. Sta. Vol. 2, No. 32 



PLATE 3 



a. 1, a. 2, a. 3, a. 4, a. 5, Apices of the early fundaments of the starfish 

 rays, numbered with reference to corresponding hydrocoele pouches. 



a. d., Aboral disk. 



h. p. 1, h. p. 2, h. p. 3, h. p. ■i, h. p. 5, h. p. 6, Hydrocoele pouches 

 Nos. 1 to 6. 



I. d. I., Left dorsal arm of preoral lobe. 



o. d., Oral disk. 



r. d. I., Right dorsal arm of preoral lobe. 



t. f.. Fundaments of first and second pairs of tube-feet. 



f. /., Ventral arm of preoral lobe. 



Fig. 9. Larva with 5 well developed hydrocoele pouches. The body 

 of the larva has sufficiently transformed to reveal the oral and aboral 

 surfaces of the future starfish and the apices of the first 5 arms. X 44. 



Fig. 10. Oblique view of a larva of a stage similar to figure 9, to 

 show the transformation of the larval body into that of the starfish. X 44. 



Fig. 11. Another larva with 5 prominent hydrocoele pouches; seen 

 from the posterior pole to illustrate the angular relations between the 

 larval and starfish bodies. X44. 



Fig. 12. Larva with 2 pairs of fundaments of the tube-feet in each 

 of the first 5 rays, the belated 6th hydrocoele pouch just coming into 

 evidence. Oral and aboral disks well developed. X 44. 



