. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ECHINOIDEA. II. 89 understand the true relationship not only of nian\- aberrant ,q;roups of Spatang^oids, 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 exp
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ECHINOIDEA. II. 89 understand the true relationship not only of nian\- aberrant ,q;roups of Spatang^oids, 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 Spalaiis^iiin, Byissinn etc. The Ingolf-Expedition. IV. 2. 12. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly r
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
