F. Borgesen: Rhodophyceæ of the Danish W. Indies. 147 



Hildenbrandia Nardi Zanardini, Synopsis Algarum in Mari Adriatico 

 hucusque collectarum (Acad. Re delle Sc. di Torino, Cl. mat. e fis., 2 ser., 

 t. IV, p. 238, tab. 1, fig. 1). J. Agardh, Spec. Alg., II, p. 494, III, p. 379. 



H ildenbrandtia sanguinea Kütz., Phycologia generaUs, 1843, p. 384, 

 tab. 78, V. 



This alga has been found in shallow water near the shore 

 covering stones and pieces of rocks. 



I have compared my plants with European specimens from 

 various places and they seem to agree quite well with these. The 

 cells in the vertical rows of cells in the thallus are about 4 — b [x 

 broad. Hauck 1. c. says that they are 4//. 



The irregularly shaped tetrasporangia are cruciately divided 

 but often the walls are placed rather anomalously. The tetra- 

 sporangia are about 25 /u long and 13 /^ broad. 



This plant occurred in more sheltered places. As I previously 

 have mentioned ^) its thin purple-reddish crusts were found upon 

 stones in a lagoon at St. Croix growing in the shade of the man- 

 grove trees; at St. Jan it was growing upon small round stones 

 in a more open place. 



St. Croix: Saltriver Lagoon. St. Jan: Cruz Bay. 

 Geogr. Distrib. : Jamaica, Brazil, Atlantic Ocean, Mediterranean 

 Sea, Pacific Ocean etc. most probably ubiquitous. 



Fam. 5. Corallinaceæ. 

 Subfam. 1. Melobesieæ. 



Par Mme Paul Lemoine. 



L'importante collection de Mélobésiées recueillie par M. Boerge- 

 SEN au cours de ses voyages aux Antilles Danoises avait été con- 

 fiée å M. FosLiE, de Trondhjem, que la mort a surpris (1909) 

 avant qu'il ait pu terminer son travail. II restait å determiner 

 un certain nombre d'échantillons ; M. Boergesen a eu l'amabilité 

 de m'en proposer l'étude. Quelques-unes des espéces déterminées 

 par M. FosLiE étaient nouvelles; au fur et ä mesure de ses 

 determinations il les avait décrites dans ses »Algologiske notiser«, 

 mais sans les figurer. Aussi ai-je repris l'étude de toutes ces 

 espéces-) de maniére å pouvoir donner ici un memoire d'ensemble 



') Børgesen, F., The algal vegetation of the lagoons in the Danish West 

 Indies. Biologiske Arbejder tilegnede Euo. Warming. København 1911. 



2) Ce travail a été fait au Laboratoire de Cryptogamie du Museum d'His- 

 toire naturelle de Paris (Professeur Mangin, membre de I'lnstitut). 



10* 



