MONOGRAPH OF THE EXISTING CRINOIDS. 239 



Catoptometra ophiura. — Each ambulacral lappet contains a single long spicule, 

 ■which from its inner end curves very gradually toward the distal end of the 

 pinnule. These spicules, which extend from the outer border of the lappets nearly 

 to the pinnulars, running near the proximal borders of the sacculi, are usually 

 roughened at each end. 



No deposits were found in the perisome over the genital organs. 



Family HIMEROMETEIDyE. 



Himerometra martensi. — At the end of the outer pinnules there are occasionally 

 to be found slender, straight spicules extending from the lappets inward to 

 between the sacculi. Except for these there are no perisomic deposits. 



There are no spicules in the tentacles. 



Himerometra magnipinna. — There appear to be no calcareous deposits in 

 the perisome of the pinnules. 



No deposits could be found in the tentacles. 



Himerometra hartschi. — The lateral perisome of the pinnules contains a row 

 of closely placed rough spicules which stand at right angles to the pinnulars, two 

 or three to each lappet. 



In their proximal portion the tentacles have a very fine continuous band of 

 spicules both on their proximal and on their distal sides. 



Himerometra rohustipinna. — There are no calcareous deposits in the perisome 

 of the pinnules. 



There are no deposits in the tentacles. 



Craspedometra acuticirra. — Each of the ambulacral lappets contains a very 

 small rudimentary plate of usually two or three meshes, rarely more, from which 

 a continuous line of spicules runs downward toward the sacculi. 



Each of the tentacles contains in its basal half two very fine continuous lines 

 of spicules, a proximal and a distal. 



Heterometra crenulata. — Each ambulacral lappet contains a relatively large, 

 but extremely delicate, multiradiate spicule with from four to six (usually five) 

 more or less curved branches radiating from a more or less complete hexagonal 

 cell. The lateral perisome contains large and prominent spicules, usually two 

 beneath each lappet, which, in general at right angles to the pinnulars, diverge 

 proximally, so that a K-shaped or lambda-shaped figure is formed. 



No deposits were found in the tentacles. 



Heterometra savignii. — Near its tip each lappet usually contains a straight, 

 less commonly forked or branched, more or less roughened spicule lying parallel 

 to the edge of the pinnular. 



Each tentacle in its basal third or half contains a proximal and a distal fine 

 continuous line of spicules. 



Heterometra philiberti. — Each of the ambulacral lappets contains a small 

 spicule, which is sometimes straight, but usually with four or five radiating branches 

 and sometimes a central cell. The perisome between the row of sacculi and the 

 pinnulars is without deposits. 



