86 



well developed, longer than in species c, nearly as long as the body. The 

 postoral band makes a simple curve above the ventral transverse rods,, 

 apparently rather unusually broad. 



The skeleton (Fig. 33). The postoral rods are like those of the species 

 a c, with few small thorns and fairly large holes. The body rod is short, 



\ 



al 



da) 



vtr 



Fig. 33. Skeleton of Echinopluteus transversus, species d. A. from the dorsal, B. from the 

 ventral side. 290 /i. Letters as in fig. 30; further: da. dorsal arch; ptr. posterior tranverse rod. 



a little curved at the point, which appears to be somewhat widened, 

 probably fenestrated, and somewhat specially adapted to the attachment 

 of the abductor muscle. The ventral transverse rods are developed so as 

 to form a high, beautiful arch; the point is bent inwards, so that they 

 overlap one another in the middle. They are somewhat thorny, a little 

 widened at the base and towards the point. From the ventral recurrent 



