346 s. GOTO : 



shorter than the other ; both have blunt ends. The second row 

 consists of two granules, of which the distal one is almost always 

 larger than the other and is sometimes developed into a short 

 spine. The last row consists of 2-4 (exceptionally 5) small 

 granules. In case a pedicellaria is present on an adambulacral 

 plate, it takes the place of the two granules next the furrow 

 spines. The first adambulacrals are not different from the others, 

 except that they more frequently bear pedicellaria. 



Mouth-plates. — The mouth-plates are comparatively large and 

 bear relatively few spines. Each plate has the form of a scalene 

 triangle, the two plates being apposed to each other by the 

 longest side, and the shortest side facing the first adambulacral 

 plate. On the furrow margin are four stout spines with blunt 

 ends, of which the one at the mouth end is larger than the 

 others and more pointed (PI. XIII, fig. 205). On the actinal face 

 of the plate are 5-7 granules either forming a single regular row 

 along the actinal suture line of the plate or more or less deviating 

 from this regular arrangement near the distal end of the 

 plate. It must also be mentioned that the first granule of this 

 row, i.e. the one nearest the mouth, frequently assumes more or 

 less a spiny form. 



VenlrolateraU. — The ventrolateral areas are relatively large 

 and the plates reach out into the arms as far as the fifth inferomar- 

 ginals from the tip. The plates are irregularly arranged, unequal 

 in size, and of various forms. Those forming a row next the ad- 

 ambulacral plates are, however, more uniform in size and shape, and 

 the majority of them bear each a transversely elongated, valvate 

 pedicellaria (PI. XIII, fig. 204, 206). These pedicellaria) are mostly 

 arranged so that their long axes are directed transversely to the 



