(129) Comparison of the data of Nordmann to the observa- 

 tions of Tomson, published one year before, showed that 

 cirripedes, on the basis of structure of their larvae, must 

 not be related to molluscs, but to Crustacea, Davydov wrote: 

 "Naturally, discoveries of Tomson and Nordmann had a very 

 great significance. They showed this role, which could be 

 played by embryological science in the study of congeneric 

 relations of organisms" (C, Davydoff. Traite d'embryologie 

 comparee des invertebrSs , Paris, 1928, p. 403) (530) . 



((130) Monograph of Nordmann was highly evaluated by 

 competent zoologists of that time. On August 23, 1844, 

 K, M, Baer, at the meeting of physico-mathematical department 

 of Petersburg Academy of Science read the report written by 

 him together with F. F. Brandt (Bericht (iber Nordmann 's 

 Monographic des Tergipes Edwardsii. Bull. CI. phys. math. 

 Acad. Sc. St. Petersb., 3, No. 16-17, 1844, S. 269-272), in 

 which it was noted that the reviewers considered this work 

 on Tergipes Edwardsii "model anatoms— physiological investiga- 

 tions of the structure and development of the named species 

 of molluscs" (p, 270) . Voicing doubt about the possibility 

 of the spontaneous conception of parasites Cosmella in eggs, 

 Baer and Brandt continued "Other remarkable peculiarities of 

 development— division of yolk sphere, presence of shell with 

 cover and two ciliary organs (vibracula of Loven) on the early 

 larval stages already were observed in the related forms, 

 although the confirmation of the similar data is always desir- 

 able..." (p. 277). In conclusion, the authors of the report 

 expressed satisfaction, that Nordmann with a great circum- 

 spection, in his work on the terminology of cellular theory, 

 distinctly differentiated the really-observed facts from 

 the theoretical assumption. In addition, they considered it 

 extremely important, that Nordmann could trace the formation 

 of muscular fibers from the primary cells of the embryo. Later 

 on, historical importance of the work of Nordmann was recog- 

 nized without reservations. The famous investigators of the 

 Molluscs — the Danish embryologists Koren and Danielsen — 

 counting their predecessors, mentioned first of all Nordmann 

 (J. Koven und D, C. Danielsen. Beitrage zur Entwickelungs- 

 geschichte der Kammkiemer, translated from Danish language 

 by Troshel, "Arch. Naturgesch", 19, 1, 1853, pp. 173-206 (534). 



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