地質学雑誌

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Fossil estherids are so similar to Posidonia and a few other genera of Pelecypoda that they are easily mistaken, but when well preserved, they can readily be distinguished from the pelecypod-genera by their shell-substance, absence of hinge teeth as well as adductor scars and notably by their surface sculpture., Futhermore, BILL and WRIGHT reported the soft parts of Estheria minuta (?) and Limnestheria ardra respectively through which the conchostracan nature of the fossil esthrids was thoroughly proved., Unfortunately, however, Estheria RUPPEL, 1837, cannot be used because it is preoccupied by Estherio ROBINEAU-DESVOIDY, 1830., Likewise, Isaura JOLY, 1841, is preoccupied by Isaura SAVINGNY, 1817., When DADAY classified the living estherids into 5 families and 11 genera, Estheria dahalacensis RUPPEL, the type of Estheria, was referred to Leptestheria., There are no less than eleven fossil-genera which have been referred to the Limnadidae or Estheriidae, but Estheria is the only genus which is quite similar to living estherids, especially to caenestherids, cyzicids and leptestherids., While leptestherids generally have reticulated sculptures, cyzicids and caenestherids more commonly possess puncated or granulated ones., However neither one of these sculptures can be used for the generic distinction of the groups, and accordingly Estheria cannot be replaced by any living genus., Therefore Estherites is proposed here to be used for fossil Estheria, and Estheria mitsuishii KOBAYASHI and HUZITA, 1942, is selected for the type of Estherites.,

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山東蒙陰(?)産Anomocarella temenus (WALCOTT)及びA., cfr., temenus (WALCOTT)の完全な標本を檢する事を得たのでAnomocarella及び其の近似屬の比較研究資料として之を記載圖示する。體節は第1の標本に於ては11, 第2の標本に於ては10であるが此の相異は同種内の生長期の相異に依るものであるかも知れない。解體せる頭・尾・體節を合して本種に歸屬せしめたWALCOTT以來の古生物學者の處置は本標本に依つて誤のなき事が實證された。

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