ヒラタブンブク LOVENIA ELONGATA (GRAY) の大棘に就て

概要

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The dorsal primary spines of the heart-urchin, Lovenia elongata (GRAY) were measured and compared with each other. The spines increase in number as well as in size with the growth of the test, in other words, as development proceeds, larger spines make their appearance later on. Two primary spines standing nearly symmetrically with regard to the III-5 plane of symmetry are nearly equal in lengths. When to spines are nearly equal in length, no matter to which side of the body, right or left, they belong, they probably are those which grew almost in the same period.大棘の數は殼の成長増大するに從ひ次第に増加し, 且つ後に發生するもの程長大である。隨つて大棘の長さが著しく異る際にはその發生の時期もまた著しく異り, 短い方は長いのに較べて餘程前に生じたものと認められる。大棘が殼の左側と右側とに於て略ぼ對稱的配置にある場合には, その長さは互に殆ど相齊しいから, 發生の時期には著しい間隔は無かつたものと認められる。
九州帝國大學農學部の論文
1932-10-00