Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 617
but among the Nautiloid tribes it more frequentlyhappens that the last-formed whorl encloses the preceding to suchan extent that they are scarcely, or not at all, visible externally, asis the case in Cristellaria (fig. 11), Polystomella (fig. 16), and Nonio-nina (fig. 19).—The turbinoid spire may… … liotalia ornata, with its pseudopodia extended. and in Valvulina the regular number is only three. Thus we areled to the biserial arrangement of the chambers which is charac-teristic of the Textularian group (fig. 14); in which we find thechambers arranged in two rows, each chamber communicating…
Microscopy · Biology
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