Echinoidea (1903) Echinoidea echinoidea00mort Year: 1903 ECHINOIDEA. II. 35 The petals are considerabh' shorter and less developed than in piisi/liis. the mimber of pores being almost double in the latter species, when comparing; specimens of a corresponding size of the two species, as is easily seen from the table given and from a comparison of figures 5 and 31. PI. XII. The pores are soniewhat smaller than in p/tsil/iis (those of tlie inner series smaller than those of the outer series), with no distinct glassy protnberance between the pores of each pair; the pairs are also more oblique and
Echinoidea (1903) Echinoidea echinoidea00mort Year: 1903 ECHINOIDEA. II. 35 The petals are considerabh' shorter and less developed than in piisi/liis. the mimber of pores being almost double in the latter species, when comparing; specimens of a corresponding size of the two species, as is easily seen from the table given and from a comparison of figures 5 and 31. PI. XII. The pores are soniewhat smaller than in p/tsil/iis (those of tlie inner series smaller than those of the outer series), with no distinct glassy protnberance between the pores of each pair; the pairs are also more oblique and more distant than in pnsillns. It is fnrther a conspicnons feature that the petals are converging outwards, the two series of each petal being more distant at the inner end — likewise a very conspicnons difference from piisillus. (Comp. Figs. 5 and 31. PI. XII). (In one specimen, 8-5''' in length, the petals are quite irregular, consisting of some few, scattered pairs of pores; onl\- the right posterior petal is almost normal. Also the genital and ocular pores are qnite abnormally placed in this specimen). There is fnrther a considerable difference from pitsilliis in the number of the small ambnlacral pores; on the actinal side they are arranged onl\ in a .single series along each horizontal suture, except in the two inner pairs of sets, in which thev form, more or less distinctly, two series. This is the case also in the largest specimens seen, 9''' in length. On the abactinal side the\' are arranged as in pusilhis, only I ha\'e been unable to dis- cern witl) certainty such pores within the petals. The genital pores I have found de- veloped in a specimen onh- 2'8™™ in length; on the other hånd I have also seen a speci- men of 4™™ length with as yet no traces of genital openings. Large genital papilke ina\' be developed. The tuberculation is soniewhat less close than in piisillus. and tlie glassy protube- rances among the tubercles are likewise less numerous, but, o
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