110 Marine Investigations in South Africa. Vol. V. 



two outer plates 0'115 mm. The median plate (figs. 9o, 10-12) 

 broad, in front a little concave and narrower, behind a little convex 

 and with the angles prominent and pointed ; the cutting edge with 

 a small median tooth with a stronger one on each side, from the 

 under side a short pointed hook moreover projected (figs. 10-12). 

 The lateral plate upwards bifurcate, the anterior part longer than 

 the posterior (figs. 9h, 13)." The outer plates (figs. 14, 15) hook- 

 shaped, the interior a little stronger than the exterior, both a little 

 blunt at the point, the interior (fig. 14a) wdth 3 small teeth, the 

 exterior with but one (fig. 146). 



The state of preservation did not admit of an examination of the 

 other organs. 



* The figure by Troschel (Z.c, p. 185 ; taf. xv., fig. 16) of the lateral plate seems 

 rather different, but is very likely but incorrectly drawn. It is not quite easy to 

 get the different plates arranged in a convenient position. 



Troschel saw in his two individuals 126 and 134 series of plates, and the median 

 plates of a breadth of 0*15 mm. 



