264 THE MARINE ALG^ OF SOUTH CAILOLINA AND FLORIDA. 



some fine specimens of 3 re/racta, Harv. A large, robust variety, 

 almost destitute of ramelli, the te minal branches revolute. 



84. Spyridia aculeata^ Harv. Common at Key West. 



Ceramiacece. 



85. Centroceras clavulatum, Ag. Key West, with the var. fi crit- 

 pulum, Harv. ; abundant everywhere. 



86. Ceramium nitens, J. Ag. Key West. 



87. Ceramium Deslongchampsii] Ch. Key West, very rare ; grow- 

 ing amongst tufts of P. ferulacea. Kot in fruit. This is new to the 

 locality. 



88. Ceramium diaphanum, Eoth. Cedar Keys, West Plorida. 



89. Ceramium tenuissimum Lyngb. Key West, very abundant. 



90. Ceramium hyssoeideum^ Harv. Common at Key West ; often 

 parasitical on Dast/a Gihhesii. 



90*. Ceramium fa&tigiatum^ Harv. One specimen, Key West ' 

 considered by Prof. Agardh possibly to belong to this species. 



91. Cronania attenuata, '5 . Kg. Common at Key West. 



92. Callithamnion Bailey i, Harv. ? So provisionally named by 

 Prof. Farlow. It has not hitherto been observed so far south as 

 Charleston Harbour, where I found this plant growing with the 

 next in the mud at low water. C. Baileyii would appear to be a 

 variable plant. The specimens under consideration have some exter- 

 nal resemblance to the British Basya arluscula, owing to the ramuli 

 being very crowded at the ends of the branches ; nevertheless it is by 

 no means the variety y of Harvey — Rochei^ which is described as 

 having that peculiarity, but a very much more robust plant. Prof. 

 Agardh thinks it may be a form of C. corymbosum. 



93. Callithamnion^ sp. ? This has been hitherto known as C. 

 polyspermum, Ag., but differs considerably from the British plant — 



*' Vix Europseum ! " J. Ag. in lit.) 



It is found abundantly on muddy banks by the Battery, Charleston 

 Harbour, at low water. I am inclined to refer it to C. Borreri, Ag. 



94. Callithamnion, sp. (*' prope C. luxurians,'^ J. Ag. in lit.). Upon 

 Sargassum filipendula ; at Cedar Keys, Gulf of Mexico. 



Chlorospeeme^. 



SiphonacecB. 



95. Caulerpa mexicana, Sond.= C. crassi/olia, Ag., var. Common 

 at Key West. 



96. Caulerpa plumaris, Ag. South Florida. 



97. Caulerpa Ashmeadii, Harv. Of this fine species I obtained but 

 one specimen at Key West. 



98. Caulerpa clavifera, Ag. Key West. 



99. Caulerpa ericifolia, Ag. Key West, abundant. United to the 

 succeeding sp. by Prof. J. Gr. Agardh in his revision of the genus 

 (Till. Alg. System., p. 23). 



100. Caulerpa cupressoides, Ag. Key West. 



101. Caulerpa lanuginosa, Ag.= C. lycopodium, Harv. Common 

 at Key West. I did not observe C. paspaloides, Bory. 



102. Caulerpa prolifera, Lmx. Key West, rare ; one specimen 

 only. 



