73 



lateral arms. The arms are of medium length, narrow, with n more or less 

 fiistinct wideiiint* al the point. There is a not very eonspieuous cluster 

 of red pigment cells in the point of the arms; series of pigment cells are 

 also seen along the vibralile banil in the lobes, in the poslero-lateral pro- 

 cesses and along the postoral and preoral band. In the body and arms 



Fig. 26. Larva of luhinomelra lucnnler. \r> days old; ventral view. --"/,. a. anal opening; 

 al. anterolateral arm;. am. amnion; da. dor.sal arch; oe. mouth; pi), posterior ciliated band; 

 pd. posterodorsal arm; pi. posterolateral process; po. postoral arm; pr. preoral arm; prb. 

 preoral ciliated hand; ptr. posterior transverse rod; vl. vihratile lobe; vtr. ventral trans- 

 verse rod. 



some irregularly scattered pigment cells are also found. The stomach is 

 yellow. 



In the skeleton the most noteworthy feature is the structure of the 

 posterior Iransverse rod, which ends in the two usual branches, the lower 

 of which is the longer and set with a series of 4 — 5 thorns along its lower 

 edge (Fig. 27). The postero-dorsal rod is fenestrated, distinctly curved 

 in the basal part. The dorsal arch has a rather long, simple median process 



10 



