(S7) 



althoiu-h I am satisfiea that Si.ecies, A., is t ne larva o"'' P. 

 archi tecta. 



Species . A. :- 



Species, A., (Fig. 34) is soraewhat smaller than Spec i es , E. , 

 aiici its averat;e leriti'ti. is l.Oo miri. Tne trunk is quite stout, 

 thP intestine is short ana the posterior end of the stoiiiach 

 reaches as far as two-thirds of the lenrth of ti.e trunk cavity» 

 vVhen about ready to metamorphose, this larva usually has It lar- 

 val tevitacles and an equal number of youn;_^ adult tentacles. The 

 adult tentacles do not usually appear until the larva has It 

 larval tentacles (its full nu{tiber) arid they arise as thickenings 

 on the under side of the bases of the larval tentacles. In this 

 respect the larva resembles one of the Actino tro ciiae v.hich Ikeda 

 (9) has described. The blood corpuscles are found in tVk'o mas- 

 ses usually applied to the ventro-lateral surface of the stom- 

 ach ai~.d they make their appearance in the larva with Ik o r 14 

 tentacles. A pair of irruscles which Ikeda has been the first 

 to describe and which he has called "retractor muscles" are al- 

 ways present. T have not been able to make these out in young- 

 er larvae than those with ten tentacles. This species is wi Ui- 

 out the so-called "stomacii divert iculae". Pigment cells are 

 found rather irregularly scattered on ine wall of the body cavit. 

 There are definit6 aggregations o^ tnese at the bases of the ten- 



