THE APODOUS HOLOTHURIANS 99 



/'/'. — Anchors 400 ju, or less in length. 



F. — Anchors over 200 /t in length ; stock a conspicuous undivided bar 

 at right angles to shaft (plate v, fig. 39). 



Accessory calcareous bodies small, oval or somewhat con- 

 stricted particles verrilli 



Accessory calcareous bodies, dichotomously divided and 

 branched rods, which often become so complicated as to 



form perforated plates (plate v, fig. 30) bidentata 



/''/''. — Aycliors mostly under 200 /x; stock widened and irregularly 

 divided (plate v, fig. 31) ; accessory calcareous bodies much 



as in bidentata adtopista 



A'A'.— Anchors 500 /t or more in length; accessory calcareous bodies curved 

 rods, or simple, short, oval, or somewhat constricted granules, or 

 wholly wanting. 

 /''. — Stock of anchor more or less branched, dichotomously or irregu- 

 larly divided, often denticulate, but not finely serrulate (plate 

 IV, fig. 13). 

 G. — Anchors very large, usually over 700 /x ; accessory calca- 

 reous bodies present. 

 H. — Anchor-plates about as long as anchors, much longer 

 than wide; at least the larger holes at center with 

 dentate margins (plate iv, fig. 13). 



Anchor-arms dentate, nearly half as long as an- 

 chor BEYCHIA 



Anchor-arms without teeth, about one-third the 



length of anchor sdspecta 



HE. — Anchor-plates much shorter than anchors, three-fourths 

 as wide as long or more. 

 I. — Accessory calcareous bodies, simple oval or ellip- 

 soidal particles. 



Holes at center of plate not much larger than 

 others; stock of anchor not divided into a 

 number of slender anastomosing branches. 



ACULEATA 



Holes at center of plate much the largest; 

 stock of anchor with slender anastomosing 



l)ranches conferta 



77. — Accessory calcareous bodies, curved rods with ends 



often enhirgcd, and notched errata 



0(?.— Aneliors from 500-700 /x in length; no accessory calca- 

 reous bodies. 

 77. — Plates more or less concave, with about 100 holes 

 (plate IV, fig. 9). 



Anchor-arms distinctly serrate abyssicola 



Anchor-arms without teeth pacifica 



H-7/.— Plates flat, with less than 50 holes tristls 



FF. — Stock of anclior usually finely serrulate, often slightly notched or 

 forked, but not at all branched or divided (plate v. fig. 32). 

 G. — Anchors about 600 it. in length. 



Anchor-arms and holes of anchor-plates with many teeth. 



INSOLENS 



