255 



may be set with small teeth. The small anchors (Fig. 46. 5) differ 

 from the large ones in being hollowed on the vertex and in having 

 only 2 — 3 teeth on the arms. They measure ca. 225 ^ in length 

 and 175 // in width. The corresponding plates (Fig. 47. 2) are very 

 like the large plates, but they do not measure more than ca. 180 [i 

 in diameter. In the anterior end of body there is not more than 

 one sort of anchors and plates, though the shape of the plates may 

 be rather varying. They are equally found in both the ambulacra 

 and the interambulacra. The anchors (Fig. 46. 4) are rather like 

 the small anchors in the posterior end of body, but they are usually 

 quite smooth on the arms. The anchor-plates are in this end of 

 body much more spiny than in the posterior end (Fig. 47. 3-4) 

 and they may often have a more or less developed network on the 

 middle, being thus rather thick. 



There are two sorts of miliary granules; oval bodies and cross- 

 shaped or "stellate" bodies. The miliary granules are as the an- 

 chors and anchor-plates different in the two ends of body, and 

 their surface is in the anterior end of body usually more spiny 

 than it is in the posterior end. In the same way the degree of 

 spination may vary from specimen to specimen. The stellate bodies 

 from the posterior end of body (Fig. 46. 9) are rather slender, with 

 long arms and with 4 — 5 small teeth on the exterior surface. These 

 teeth may in some specimens be nearly wanting. Closer to the ten- 

 tacles the stellate plates are thicker and the two arms are here 

 usually united, the plate thus being perforate. The teeth are here 

 only low knobs. Such small plates (Fig. 46. 8) may be exceedingly 

 crowded closest to the tentacles, and often united into larger plates 

 with 6 — 8 holes. The rounded bodies are in the anterior end of 

 the specimens only found in the ambulacra. They are usually 

 elongated (Fig. 46. 12) and consist of two different sorts, the one 

 measuring 20 ^ and the other 30 fi in length. In the posterior 

 end of the specimens such bodies are also found in the interambu- 

 lacra. They are here nearly circular (Fig. 46. 10) and do not measure 

 more than ca. 20 fi in diameter. 



In the tentacles there are three different sorts of rods. The 

 rods in the digits (Fig. 46. 7) are very irregularly shaped. They 

 are usually bent and measure 30 — 50 fit in length. The rods in 

 the tentacle-stem are distinctly different from those in the digits. 



