302 s. GCTO : 



between the actinal and the lateral side of the arms ; the re- 

 maining one or two lie entirely on the actinal side and are 

 mostly less than half as long as the outermost spine. Besides 

 these large spines, there are many very small, almost ciliary 

 spines arranged along the margin of the plate. Similar 

 but sHghtly larger spines are also present more or less between 

 the large spines. There are also some 2 -jawed forcipiform pedi- 

 cellarioe of different sizes intermixed with the smaller spines, and 

 situated mostly along the margin of the plate ; on a plate not far 

 from the disk, I counted in one case as many as ten pedicellariae, 

 mostly situated along the adcentral border. The outer part of 

 the fasciolar grooves are covered with capillary spinelets. On the 

 abactinal side of the outermost of the large spines, there is a 

 space sometimes almost naked but mostly covered with small 

 conical spines somewhat larger than those of the actinal surface 

 of the plate. 



Adamhulacral plates. — There are as many adambulacrals as 

 inferomarginals, and the two are strictly coincident, though 

 separated from each other by a single series of small ventro- 

 lateral plates. Each adamhulacral plate presents a rounded sur- 

 face on the actinal side, and the armature is very characteristic. 

 There is, namely, a slender forliciform pedicellaria at the furrow 

 end of the plate (PI. VI, fig. 98, 99, 101) well down in the 

 ambulacral furrow ; it is slender and elongated, mostly half as 

 long as the first spine, and often looks, on a cursory view, hke 

 a spine ; but when the two jaws are apart, its true nature can 

 be recognized at once. Close to the pedicellaria lies the first 

 adamhulacral spine, which is sword-shaped, slightly curved and 

 flattened hke the corresponding spine of the species previously 



