. Echinoidea . Psendocentrotus Pseudoboletia Sphærechinus Tripneustes Toxopneustes Gynmechinus Psammechinus Paracentrotus Stomopneustes Sterechinus Echinus \ ! â .,j Parechinus Colobocentrotns Heterocentrotus Echinonietra Toxocidaris Echinostrephus Heliocidaris Pseudechinus Loxechinus The result of the studies of Ecf/ii/oijufrada- and Triplcchinidæ represeuted here, is expressed in the followiug system. Fam. Stomopneustidæ n. iam. The spicules irregular, more or less tubular fenestrated piates. The globiferous pedicellariæ without end-tooth") The stalk compact. Only one genus known. S
. Echinoidea . Psendocentrotus Pseudoboletia Sphærechinus Tripneustes Toxopneustes Gynmechinus Psammechinus Paracentrotus Stomopneustes Sterechinus Echinus \ ! â .,j Parechinus Colobocentrotns Heterocentrotus Echinonietra Toxocidaris Echinostrephus Heliocidaris Pseudechinus Loxechinus The result of the studies of Ecf/ii/oijufrada- and Triplcchinidæ represeuted here, is expressed in the followiug system. Fam. Stomopneustidæ n. iam. The spicules irregular, more or less tubular fenestrated piates. The globiferous pedicellariæ without end-tooth") The stalk compact. Only one genus known. Stomopneustes Ag. The pores trigeniinate. Only every fourth or fifth ambnlacral plate with primary tubercle, but this tubercle is large and spreads over several ambnlacral piates. The spines long and thick; small spines on the buccal The bnccal membrane with numerous fine fenestrated piates, quite im- bedded in the skin. The gills with numerous three-radiate spicules. A deep fnrrow along the median line in the interambulacral areas. M Perhaps here mav be found, besides the large globiferous pedicellariæ without end-tooth (and without poison gland?), a smaller form of globiferous pedicellariæ of the common structure. (See above p. 126).
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1903
