THE APODOUS HOLOTHUBIANS 99 



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



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

 at right angles to shaft (plate v, fig. 29). 



Accessory calcareous bodies small, oval or somewhat con- 

 stricted particles VEERILLI 



Accessory calcareous bodies, dichotomously divided and 

 branched rods, which often become so complicated as to 



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



/*'/''. Anchors mostly under 200 ft. ; stock widened and irregularly 

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



as in bidentata AUTOPISTA 



KK. Anchors 500 /* or more in length; accessory calcareous bodies curved 

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

 wholly wanting. 



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

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

 iv, fig. 12). 



G. Anchors very large, usually over 700 p ; 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 BRYCHIA 



Anchor-arms without teeth, about one-third the 



length of anchor SUSPECTA 



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



as wide as long or more. 



/. 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 



branches CONFERTA 



II. Accessory calcareous bodies, curved rods with ends 



often enlarged, and notched ERRATA 



GO. Anchors from 500-700 p. in length; no accessory calca- 

 reous bodies. 



H. Plates more or less concave, with about 100 holes 

 (plate iv, fig. 9). 



Anchor-arms distinctly serrate ABYSSICOLA 



Anchor-arms without teeth PACIFICA 



HH. Plates flat, with less than 50 holes TRISTIS 



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



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

 G. Anchors about 600 ^ in length. 



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



INSOLENS 



