IV. On the origin of the triradiate spicules of Leucosolenia | Zendy

E. A. Minchin | Zendy

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IV. On the origin of the triradiate spicules of Leucosolenia

Author(s) -

E. A. Minchin

Publication year - 1895

Publication title -

proceedings of the royal society of london

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.814

H-Index - 135

eISSN - 2053-9126

pISSN - 0370-1662

DOI - 10.1098/rspl.1895.0031

Subject(s) - sponge spicule , trefoil , anatomy , epithelium , layer (electronics) , biology , geology , chemistry , genetics , agronomy , organic chemistry

InLeucosolenia coriacea the youngest spicules are found to be surrounded by six cells, which are similar in all their characters to the cells of the external flat epithelium of the sponge, and undoubtedly derived from this layer. It appears that three cells of the external epithelium wander inwards, and give rise to six by division of each cell into two, the six cells being arranged in such a way, that three are placed more internally,i. e. , towards the gastral surface of the body wall, and three m ore externally, towards the dermal surface. Each of these sets of three cells has a form which might be compared to a trefoil, and the whole mass may be described as two such trefoils superposed, the cells of one trefoil exactly corresponding to those of the other.

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