47 



Fig. 05. 'Free-swimming' larva, from the right side, x 177. 

 Fig. 66, A young attached larva, showing the basal and 



oral plates, the primary tentacles and the 



primary sacculi. x 40. 

 Fig. 67. An older attached larva, showing the radial 



plates interposed between the basals and orals, 



and supporting the two primibrachials in each 



of the radii, x 40. 

 Fig. 68. The calyx of a decalcified attached larva, five 



weeks old, viewed from the left side. After 



Seeliger, from Lang. 

 Fig. 69. A still older attached larva, showing the five 



pairs of arms as they appear before the 



development of the first pinnules, x 22. 

 Fig. 70. The calyx and part of the stalk of a nearly 



fully developed attached larva, showing the 



developing cirri, x 12. 

 Fig. 71. Portion of one of the arms of the specimen 



represented in fig. 70, showing the " covering " 



plates. 



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