We wish to help you with what you are looking for and can recommend the following book:
EKMAN, GUNNAR: EXPERIMENTELLE UNTERSUCHUNGEN ÜBER DIE ENTWICKLUNG DER KIEMENREGION (KIEMENFÄDEN UND KIEMENSPALTEN) EINIGER ANUREN AMPHIBIEN. Leipzig, Wilhelm Engelmann, 1913. 8vo. [2] pp. + pp. 419-592 pp. 85 text illustrations. ¶ First separate edition (also published in Helsinki), reprinted from Morphologisches Jahrbuch, 47. Printed wrappers, extra blank stiff wrappers added. DKK~ 240 NOK~ 255 SEK 301 EUR~ 32 USD~ 50 GBP~ 20 JPY~ 5.233 · EDL49084 · Olof Edlund, Årsta (SE) ·

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