A History of Infusoria, Including the Desmidiaceæ And Diatomaceæ. British And Foreign
A History of Infusoria, Including the Desmidiaceæ And Diatomaceæ. British And Foreign
Pritchard, Andrew, 1804-1882
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(v. 85.) Elbe. Disc with radiating series of minute puncta, 8 or 10 marginal teeth or minute pro- cesses, and no umbilicus. Front view with minute, erect, marginal teeth. Genus HALIONTX (Ehr.). — Frustules orbicular, not concatenate; disc rayed ; number of rays definite, not starting from the nmbOicus ; no internal septa. It resembles Actinocydus, except in its umbilicus not being radiate ; or, in other words, its central ocellus is wanting. In like manner Coscino- discus differs from Symboloph...ora in its non-radiate umbilicus^ which is a simple void space. Halionyx tenarius (E.). — Surfece of disc with six rays; each compartment is marked by parallel lines, wnich de- crease by eyaal gradations on either side of a radiating median line ; loosely and widely cellulose ; umbilicus entire, punc- tated. KA. p. 130. Antarctic Ocean. XHam. 1-720". Af^ioMihea Actincptychm wndulatus. H. undenarim (E.). — Disc with eleven or twelve rays; umbilicus lara^, punc- tated, not radfiant (v. 82.) EM.
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