514 Cresswell Shearer, Studies on the Development of Larvai Nephridia. 



Piate 33. 



Fig. 55. Ph. brcmchiata, Actinotrocha larva showing the nephridia and soleno- 

 cytes and the lateral portions of the trank coelom. 



Fig. 56. Ph. hippocrepia, Diagrammatic reconstruction of a young larva. 



Fig. 57. Ph. branchiata , Actinotrocha larva. Ventral view of the same larva 

 as that shown in Fig. 55. 



Fig. 5S. Model of a young larva of Actinotrocha branchiata, reconstructed 

 from the seriea of sections part of which are shown figS; 19 — 24 pl. 31. 

 It is represented as partially cut open and seen from the ventral snr- 

 face. oes Oesophagus, m.f muscle fibres running from the ectoderm 

 to the Oesophagus, nephr. nephridia with solenocytes, i tirst pair of 

 tentacles, pre.l preoral lobe, ree rectum, tr.c.v ventral portions of the 

 trnnk coelom which are about to meet on the ventral median line. 



