Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . r relation, Triceratium;but the discovery of a species of Triceratium grow-ing in zigzag chains has destroyed that valued correspondent of mine states it as hisbelief that all recent species of Triceratium willultimately be found growing in that manner; butwhether the genus Amphitetras should be mergedin that of Triceratium, or the two genera formedinto a new genus with somewhat enlarged genericcharacter, is a question which will require a moreperfect knowledge of the
Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . r relation, Triceratium;but the discovery of a species of Triceratium grow-ing in zigzag chains has destroyed that valued correspondent of mine states it as hisbelief that all recent species of Triceratium willultimately be found growing in that manner; butwhether the genus Amphitetras should be mergedin that of Triceratium, or the two genera formedinto a new genus with somewhat enlarged genericcharacter, is a question which will require a moreperfect knowledge of the two genera than we atpresent possess. The species and varieties I amabout to describe I think belong to the genus Am-phitetras as at present constituted. Amphitetras autediluviana.—The so-called typicalform of this species has cubical frustules, coheringat the angles, forming a zigzag filament; valvesquare, with straight sides, and the angles more orless rounded; the surface has coarsely cellularmarkings. This species is variable in size andwidely distributed. Var. /3 has the sides deeply incurved and the. Fig. 283. Amphitetras antediluviaua, var. y. *^ J^ £ & , of only one locality in which it has been found, viz.,Hayling Island, Hants, in which it was rare, a and (3 were more plentiful in it. (Fig. 283, x 400diam.)Dr. Greville describes and figures, in the Tran-sactions of the Royal Micr. Soc., vol. xiii., pi. ix.,fig. 27, a form which he calls Amphitetras nobilis,and which seems to differ from var. y in the pro-duced tubular apices. His species was detected iudredgings from the Red Sea.
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