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On the generative Organs and Products of Tomopteris 

 onisciformis Eschscholtz. 



By 

 J. H. FuUarton, M. A., D. Sc, F. R. S. E. 



Zoologist to H. M. Fishery Board for Scotland, Edinburgh. 

 With Plates 26—28. 



Oken's Isis of 1825 made known and briefly delineated the 

 characters of a new genus which had been discovered by Eschscholtz ^) 

 in the South Sea, and the species was named by him Tomopteris 

 onisciformis. The true position in the Animal Kingdom of this trans- 

 parent animal was misunderstood. Eschscholtz placed it amongst 

 the "Schnecken", in his third family, the Heteropods of Lamarck. 



Quo Y & Gaimard 2) found the same genus in May 1826 in the sea 

 in the neighbourhood of Gibraltar, but did not know of its previous 

 discovery by Eschscholtz , and they named it Briarea scohpendra. 

 Both Eschscholtz and Quo y & Gaimard regarded the lateral ap- 

 pendages as respiratory organs, the former calling them "Respirations- 

 flossen", the French authors designating them "pieds-branchies ou 

 appendices branchiaux". The view taken of these appendages naturally 

 led them to consider the new gelatinous and transparent animals as 

 most nearly allied to such Gastropods, as the Heteropods on the one 

 hand, and the Nudibranchs on the other. The French naturalists seem 



1) Eschscholtz, Bericht über die zoologische Ausbeute während 

 der Reise von Kronstadt bis St. Peter und Paul, in: Isis v. Oken, 

 Jahrg. 1825, Heft 6, p. 733, tab. 5, fig. 5. 



2) Ql'oy & Gaimard , Observations zoologiques faites à bord 

 d'Astrolabe, en Mai 1826, dans le détroit de Gibraltar, in: Ann. Sc. 

 Nat., V. 10, 1827, p. 236, tab. 7, fig. 1. 



Zool. Jahrb VIII Ablh. f. Morph 28 



