Alsrae. 189 



■s 



(C. pinnata f. pectinata Weber); and C. sertularioides f. longipes Ag.) 

 Collins [C. plumaris f. longipes Weber). Maxon. 



Gardner, N. L., Leuvenia, a new genus of Flagellates. 

 Univ. of Calif. Publ. in Bot. IV. 4. p. 97—106. pl. 14. May 26, 1911.) 



Description of Leuvenia Gardner, a new genus of Flagellates, 

 with a Single species, L. natans Gardner discovered on the surface 

 of fresh water in a shaded ravine emptying into Lake Temescal, 

 Oakland, California. The organism is described in each of the 3 con- 

 ditions known: The motile stage, the growth stage, and the palmella 

 stage. The S3 r stematic position of the organism is regarded as uncer- 

 tain. Maxon. 



Gardner, N. L., Variations in nuclear extrusion among 

 the Fucaceae. (Univ. of Calif. Publ. in Bot. IV. 6. p. 121 — 136. 

 pl. 16—17. August 26, 1910.) 



Following a review of the taxonomic history of the Fucaceae, 

 with mention of the characters wich have successively been regar- 

 ded as diagnostic, the writer presents eertain preliminary results of 

 his investigations (mainly cytological) of material collected along the 

 Pacific coast. Two new genera are described: Hesperophycus Set- 

 chell and Gardner, with a Single species, Hesp. Harueyanus (Decne.) 

 Setchell and Gardner (Fucus Harveyanus Decne.); and Pelvetiopsis 

 Gardner, with a Single species, Pelvetiopsis limitata (Setchell) Gard- 

 ner [Pelvetia fastigiata forma limitata Setchell). Two forms of the 

 latter are recognized, f. typica Gardner, and f. lata Gardner. 



Maxon. 



Herdman, W. A., Dinoflagellates and Diatoms on the 

 Beach. (Nature. LXXXVI. 2173. p. 554. 1911.) 



A greenish-brown discoloration of the sand on the beach at 

 Port Erin on April 7 th , 1911, consisted of a few Diatoms and a 

 large quantity of the peridinian Amphidinium operculatum. The 

 peridians were very active rapidty multiplying. On June 3 rd , the 

 discoloration of the sand was still present, but consisted exclusively 

 of a Xavicula of the "amphisbaetia-group" , and no trace of the 

 Amphidinium could be found. C. S. West. 



Herdman, W. A., The Vernal Phytoplankton maximum. 

 (Nature. LXXXVI. 2172. p. 517. 1911.) 



The author shows that the vernal maximum of phytoplankton 

 in the Irish Sea is really a complex made up of the maxima of 

 several different species or groups of species which seem to occur 

 in a definite sequence, but may be earlier or later, more spread • 

 out in one year or more telescoped together to form a Single diatom 

 maximum in another. Moreover, the individual species or groups of 

 species may be more abundant one year than another. In 1911 

 Biddulphia reached its maximum in March, Chaetoceras in the latter 

 part of May, and Rhisosolenia in early June. 



The water of the bay at Port Erin, Isle of Man, was visiblv 

 discoloured in June by the unusual abundance of Rhisosolenia On 

 a calm surface of the sea, with the sun shining, there is a peculiar 



