198 SUMMARY OF CURRENT RESEARCHES RELATING TO 



occurs abundantly, giving them a blue colour), but was found by the 

 present author covering specimens of Liehmannia LeveiUii. He has, 

 however, never found it on other species of Pheeophj-ceae. N. ostrearia 

 is said to require a certain admixture of fresh-water with the sea- 

 water, but when growing on Liebmannia it was in sea-water pure and 

 simple. As regards the seat of the blue colouring-matter, the author 

 finds that it is in the protoplasm, thus confirming the assertion of Ray 

 Lankester : on the other hand, he combats the statements of that 

 zoologist with regard to the extreme difficulty of dissolving the colour- 

 ing matter. Sauvageau finds that a simple drop of fresh- water dissolves- 

 it out at once. 



Yorkshire Diatoms.* — R. H, Philip gives a list of 19 Diatoms 

 collected by M. H. Stiles in the Bog Pond at Askern in last July, and 

 adds a list of 27 additional species collected by himself in Askern Pool,, 

 and some of the adjacent pools and ditches. 



Growth of Globular Algse.t — T. Hedlund has made a study of the 

 rate of increase in growth in algae of a globular form, as this form 

 lends itself more easily to such a study. Several species were investi- 

 gated which are found living symbiotic-ally in CJadonia, Fhyscia, and 

 other lichens. The author finds that an alga grows more quickly when 

 free than when in touch with others. It grows more slowly when its 

 protoplasm is undergoing division ; as also when division is complete, 

 but the protoplasts are not divided by any cell-walls. Growth begins 

 to slacken one or several days before division takes place ; and the more 

 numerous the plasma bodies to be formed, the longer time beforehand 

 does the diminution in growth begin. The individuals which arise from 

 the swarmers grow more slowly at the beginning when they are still very 

 small, than later. The alg£e, which are removed from a heteromerous 

 lichen thallus do not all grow at the same rate, even when they are from 

 the same part of the thallus. The author describes his experiments, and 

 tabulates many of his results. 



A New Genus of Chrysomonadineae.J — R. Lauterborn describes 

 minutely a new genus PalatineUa of this group, to which of late years so 

 many additions have been made. PalatineUa cyrtophora, the single 

 species of the genus, grows affixed to a filament of Bulbochate ; it is 

 related on the one hand to Pedinella and on the other to Chrysamaha. 



Calcareous Deposit in Lough Carra.§^R. Lloyd Praeger quotes 

 in a short note the answer sent by W. West to questions by the 

 author, on a possible connection between algge and the calcareous deposit 

 that covers the bottom of Lough Carra. West finds that much of 

 the matrix of the calcareous incrustation is formed by Dasyglma 

 amorplia Berk., and he records also Stigonema mamiUosion Ag., Phor- 

 midium (?) tenue, and others. He suggests an explanation for the 

 curious fact that, while deposition of lime is going on in Lough Carra, 



* Naturalist, No. 599, 1906, p. 428. 



t Botaniska Studier tillagnade. Upsala : F. R. Kjellman, 1906, pp. 35-54 (with, 

 tables). X Zool. Anzeig., xxx. (1906) pp. 423-8. 



§ Irish Naturalist, xv. (1906) pp. 232-3. 



