MONOGR.'VPH OF THE EXISTING CRINOIDS. 



267 



band two or three meshes wide, rarely wider, which toward the inner edge of the 

 lappet gradually broadens and forks so that its end is Y-shaped, the proximal arm 

 of the Y being as broad as the original band and making only a slight angle 

 with it, while the distal arm is smaller and narrower, making a considerably 

 greater angle with it; occasionally there is merely a spatulate expansion of the 

 outer end instead of the Y. 



There are no deposits in the tentacles. 



Coccometra guttata. — Each ambiilacral lappet contains a long, uniform, smooth, 

 slender rod, pointed at each end and slightly bent in the middle, which runs from 

 the tip of the lappet to the edge of the pinnulars, each rod tangent to a sacculus 

 on its proximal side. 



There are no spicules in the tentacles. 



Coccometra nigroUneata. — Each ambiilacral lappet contains a long, slender, 

 uniform rod, slightly roughened at the distal end and slightly bent in the middle, 

 which runs, tangent to the proximal side of a sacculus, to the edge of the pinnular. 



Coccometra hagenii. — Each of the ambulacral lappets contains an extremely 

 slender straight rod which runs downward tangent to the proximal border of the 

 sacculus. This rod may be so reduced as not to extend beyond the distal edge of 

 the sacculus, or it may even be entirely absent. 



There are occasional minute rods in the tentacles, but most of these are with- 

 out deposits. 



Perometra diomedew (fig. 772, p. 362).— Each ambulacral lappet contains a 

 slender, usually straight, rod of medium length which runs downward to the 

 vicinity of the sacculi. 



There are no deposits in the tentacles. 



Erythrotnetra (mstralis (fig. 773. p. 362).— Each ambulacral lappet contains 

 a short, rather stout, rod which is slightly swollen and roughened at each end, 

 especially the outer. 



There are no deposits in the tentacles. 



Erythrometra ruler.— Each ambulacral lappet contains in its outer portion a 

 short straight rod directed outward and distally. 



There are no deposits in the tentacles. 



Flypalometra defecta (fig. 768. p. 362).— Each ambulacral lappet contains a 

 single long, very slender, conspicuous rod directed outward and distally at an angle 

 of about 60°. 



Each tentacle contains a thin line of spicules placed end to end and slightly 

 overlapping which runs nearly to the tip. 



There are no deposits in the tentacles. 



Nanometra howersi. — Each ambulacral lappet contains a stout and prominent 

 rod. slightly bent in the middle and slightly roughened at each end. 



There are no deposits in the tentacles. 



Nanometra clymene. — Each ambulacral lappet may contain a short, smooth, 

 bent rod, but these appear to be rare, only occasionally being met with toward 

 the tips of the pinnules. 



