﻿April, 1857.] 



ELLIOTT SOCIETY. 



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sidered as analogues the one of the other; and whilst the analogies of 

 Charleston Harbor appear to be greatest with the Fauna of the 

 Mediterranean, it has, nevertheless, strong relations with the 

 Fauna of the English and Irish channels, which merit attention. 

 On the other hand, Pennaria, which, so far as I am acquainted / 

 with the subject, is on the European side, known only from the 

 Mediterranean, is in America found as far north as the isother- 

 mal 50°, and as far south as the isothermal of 66°, thus establish- 

 ing a sort of relation between the Mediterranean and the northern 

 part of this zone in America. Again, between the southern waters 

 of Great Britain and Charleston Harbor, there are not only strong 

 analogies, but it is doubtful whether some of the species are not 

 identical. The genus Willsia has but two known representatives, 

 and these are natives, one of the south coast of England and the 

 other of Charleston Harbor. The three representatives of the genus 

 Turritopsis are found, one in the Mediterranean, (T.fiavidula) one 

 on the coast of Devon, (T. pusilld) and one in Charleston Harbor, 

 (T. nutricula.) Of Saphenia, two species are found in the Medi- 

 terranean, two in the British channel, and one in Charleston Har- 

 bor. The last, T. apicata, is so like the T. Titania, from the coast 

 of Devon, that it may be doubted whether subsequent research 

 will not prove them identical, and at least they are lepresentative 

 species. It is likewise doubtful whether the Eudendrium ramosum 

 of the English and Scottish coast does not extend to Charleston 

 Harbor. I have not been able to distinguish between the Jlglao- 

 phenia cristata of the coast of Great Britain and that of Charleston 

 Harbor. The genus Epenthesis has probably representatives on 

 both coasts and, Liriope is like Turritopsis, represented in the 

 Mediterranean as well as in the British seas, and in Charleston 

 Harbor. The conclusion naturally arises from this comparison 

 that the Fauna of Charleston Harbor, so far as the Hydroid Me- 

 dusae are concerned, has more analogies with that of the southern 

 waters of Great Britain, whose latitude is nearly that of Labrador, 

 than with the Fauna of Boston Harbor, whose latitude is nearly 

 that of Rome, and which, moreover, belongs to the same continent. 

 This analogy can, it appears to me, find its only explanation in the 

 Gulf Stream, which passes by our doors to encircle the coasts of 

 Great Britain. 



In conclusion, the Fauna of Charleston Harbor appears to me 

 to present the three following geographical relations : 

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