290 Algae. 



species and form the most used works are quoted and then its 

 habitat in Denmark and a Short indication of itsgeneral distributon. 



Ca. 600 species of diatonis are known from Denmark and 

 many of them in numerous forms; thus the author gives the total 

 number of 929. Of these the following species (besides several 

 varieties) are new: Caloiieis glaberrirna, C. lanceolata, C. Tous- 

 siengiij C. Waymingii, Neidiiim calvuni, N. fasciatum, N. teinie, 

 Navicula Fusticidus, N. Deciissis, N. pevexigua, N. Rosenbergii, 

 Stauroneis perlttcens, Cymbella compacta, C. dorse-notata , C. protracta, 

 C. stigniaphoraj Gomphonema platypus, Atiomoeoneis intei'inedia^ 

 Pinnidaria inconspicua, P. perpusilla, P. discifera, Amphora cimbrica, 

 Rhoicosphenia linearis, Cocconeis quadratarea, Achnanthes laevis, A. 

 crucifera, Snrirella venusta, Nitsschia creticola, N. oblongella, Eunotia 

 elegans, Fragilaria. gracilis, F. Heidenii (= Synedra inflata Heid.), 

 F. laevissima, F. subconstricta , F. temdstriata , Tetracyclus Lewisianus, 

 Melosira perglabra. 



In a tabular list the general distribution of the Danish diatoms 

 is given for the continents: Europe, Africa, Asia, America^ 

 Australia, Arctic and Antarctic regions. Several other tables 

 illustrate which forms characterise the different samples from ditfe- 

 rent localities in the Jutland Peninsula and the island Sjaslland. 

 The author divides the freshwater samples into three groups: 1) 

 those from running waters, 2) those from moors and 3) those from 

 stagnant waters (incl. lakes). Under each of these groups he mentions 

 which genera are more common in Jutland, which in Sjaelland 

 etc. Among the many considerations raised from the tables is alsa 

 to be mentioned that the Jutland peninsula has a number of 

 forms "peculiar" to it and these forms mostly occur on heaths and 

 Sandy grounds. Of the 621 freshwater forms from Denmark 410 

 occur in Sjaelland, 449 in Jutland; among the last ones are 17 

 which commonly are considered as "polar" or "alpine", while in 

 Sjaelland only one of that kind has been found. The "polar" forms 

 in Jutland have mostly been forms in the northern and western 

 parts and in the heath districts and may be considered as traces of 

 a former colder climate. 



The 5 plates contain drawings of the new species and varieties 

 and of several critical and rare forms, altogether 129 figures. They 

 are excellentl}^ drawn and well reproduced (phototypes). 



C. H. Ostenfeld. 



Oestrup, E., Diatoms from North-East Greenland (1\\ of 

 7 6° N. Lat.) collected bj' the "Danmark-Expedition". 



■ (Medd. om Grönland. XLIII. 10. p. 193—256. with 2 pl. Kjöben- 

 havn, 1910.) 



The material examined is 1) from salt water (19 samples) along 

 the East Greenland coast between 76° 30' and 77° 30' N. Lat. and 

 2) from freshwater (30 samples) at the Danmark Harbour, Germania 

 Land, 76° 46' N. Lat., 18° 43' W. Long. 



1. Marine Diatoms. 182 forms have been found in the mate- 

 rial of which 24 have until now been unrecorded from the arctic 

 seas. The remaining 86. 8^/^ indicate an easterl}'- tendency as regards 

 their arctic distribution. 



New species are: Navicula rostelloides, N. snbcuneata, N. goni- 

 phonemoides, Amphora virgata, A. venusta, Achna^ithes rhombica, 

 A. septentrionalis, A. debilissima and Snrirella insignis. Further 

 several new varities. 



