Archive image from page 392 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex4apt1a2daniuoft Year: 1899-1953 ECHINOIDEA. II. 89 understand the true relationship not only of nian\- aberrant ,q;roups of Spatangoids, but also their relationship to the Cl\]5eastroids and Echinolanipadie . | Chall. -Ivch. p. 14S1. I give here a graphic representation of the nnitnal relationship of the vSpatangoids, as I inider- stand it. It will be seen that my view of the Mcridostertiatd is in rather close accordance with that rejjresented in the tabular view of the JMcridn
Archive image from page 392 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex4apt1a2daniuoft Year: 1899-1953 ECHINOIDEA. II. 89 understand the true relationship not only of nian\- aberrant ,q;roups of Spatangoids, but also their relationship to the Cl\]5eastroids and Echinolanipadie . | Chall. -Ivch. p. 14S1. I give here a graphic representation of the nnitnal relationship of the vSpatangoids, as I inider- stand it. It will be seen that my view of the Mcridostertiatd is in rather close accordance with that rejjresented in the tabular view of the JMcridnstrnii given by Lambert.' 1 ma\- notice expressly that it is not meant as a genealogical tree of the genera. As for the families, I do not doubt that they have realh' been derived from one another in the direction here indicated. Plexechinus Cystechinus(?)2 Pilematechinus Urechinus / Stereopneustes â¢?-â Ananchytidse Pourtalesia Echiuosigra Spatagocystis Ceratophysa Cystocrepis Helgocystis Kchinocrepis Calynniid;e Sternopatagus Clypeastroidea h3 Spatangidrc 3 Pakeostomatidte AeropidjE Cassiduloidea Holectypoidea Diademina ' Etudes inorph. siir le plastron des As for Lambert's remark (O]). cit. p. 93) that the Pourtalesia: must form a small separate family - reliee par Urechinits aux vrais Ananchytiii(T et rattaehee aux Spalangida ])ar Palcvotrofms et Physnsier \ I must refer to the above remarks agaiust seeking transitions between the Pourtalesiiu and the Ampliisternata. Lambert is here, evidentl)-, in disaccord with the views otherw-ise expressed throughout that excellent paper. - This genus is quite insufficiently known and possibly does not really lielong to this family. (Conip. abovep. 46, 49. 3 Sensu latiori, comprising Spalaiisiiin, Byissinn etc. The Ingolf-Expedition. IV. 2. 12
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