80 



bow and passes nearly straight on to the postoral armsi). Along the dorsal 

 side the band goes almost straight down to the base of the postoral arms, 

 where it then makes an almost right angle before passing out along the 

 arms There is no indication of ciUated lobes or epaulets. The oral area 

 is very large, the large mouth opening lying free, contrary to what obtams 

 in the species e and f, where it is covered by the preoral lobe. The rectum 

 I have not been able to distinguish with certainty, but it seems that the 



Fig. 30. Skeleton of Echinopluteus transversus, species a. A. from the ventral, B. from the 

 dorsal side. ^"/i. al. anterolateral rod; b. body rod; cr. connecting rod; po. postoral rod: 

 r. recurrent rod; str. supplementary transverse rod; t. thorn; vr. ventral recurrent rod; 



vtr. ventral transverse rod. 



anal opening lies in the posterior part of the body, below the pair of supple- 

 mentary transverse rods lying here over the middle of the stomach. — No 

 trace of pigmentation is seen. 



The skeleton (Fig. 30). The postoral rods are of the usual fenestrated 

 type, with rather large holes and with some few, small thorns along both 

 edges. The body rod is short, with some irregular thorns along its outer 

 edge, and apparently with a simple, not widened point, showing no special 

 adaptation for the attachment of the abductor muscle. The ventral 



^) In the preserved specimen the postoral band is even more straight than in the figure, 

 passing somewhat below the points of the ventral transverse rods. That this is due to con- 

 traction on preservation is evident, the natural position of the band being above the point 

 of the ventral transverse rods; in that position it is also seen in species c and d. I have there- 

 fore not hesitated in showing the band in its natural position in the figure. 



