REPORT 
ON THE 
WORKS WHICH HAVE APPEARED DURING 
THE YEARS 1841 AND 1842, 
ON THE 
ECHINODERMATA, ACALEPHA, POLYPI, AND INFUSORIA. 
BY 
PEOFESSOR C. TH. V. SIEBOLD. 
ECHINODERMATA. 
Zoologists and Physiologists have, last year, directed much of their 
attention to the Echinodermata (upon which there has been no report 
in these Archives since 1838), so that this class promises to be more 
completely described than any other of the invertebrata. 
Agassiz has principally distinguished himself in this department, as 
for several years he has been zealously publishing “ Monographies 
d’Echinodermes vivans et Fossiles,” of which four admirable livraisons 
are now before the reporter. He has also already treated of this class 
in his “ Nomenclator Zoologicus, Fasc. 1. Soloduri, 1842.” 
Sharpey has published an ample treatise on the internal structure of 
the Echinodermata (Cyclop, of Anat. and Physiol, vol. ii. 1839, p. 30) ; 
and Dujardin has also laboured at this class, in the third volume of 
Lamarck’s Natural History. 
Forbes has published an excellent work on the British Echinoder- 
mata, which is illustrated, in a truly luxurious manner, with beautiful 
woodcuts (A History of British Starfishes, and other Animals of the 
Class Echinodermata. London, 1841). This is a proof, that in England, 
the interest for Zoology must be more extensive than in Germany. Of 
late years a number of beautifully illustrated monographs on the British 
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