4S2 Prof. Dr. C. Meresclikovsky on 



nests. An exception, however, appears to be in C. genneserm^ 

 Carp., described from Galilee, where it was discovered living 

 under stones in a salt-spring (Carpenter, 1913). 



Appended are some notes relating to the occurrence o£ 

 C. buxtoni kindly supplied by Mr. Buxton, to whom my 

 thanks are due for giving me the opportunity of examining 

 the material : — 



" Freetown, Sierra Leone, 19. vi. 1917. 



" Cyphoderns collected from a termites' nest, in which they 

 occurred in great numbers. Tlie nest was a hard mud turret 

 18 inches high on the golf-course, and had been made appa- 

 rently by Eutermes suspensus, Silv., which inhabited it in 

 immense numbers. The nest also contained right in its middle 

 a colony of Pericapritermes urgens^ Silv., workers, soldiers, 

 and winged sexual forms, and a few Basidentitermes poiens, 

 Silv., of which I only secured nasutes. The termites have 

 been named by Prof. Silvestri." 



LiTEEATURE, 



BoENER, C. "Neue Cyplioderiuen." Zool. Anzeig. 1913, p. 274 et seq. 

 Carpenter, G. H. " A new Spring-tail from Galilee." Journ. & 



Proc. Asiatic Soc. of Bengal (new series), vol. ix. no. G, 1913, 



pp. 215-217. 

 Wahlgrex, E. " Apterygoten aus Aegypten und dem Sudan." 



Results of tlie Swedish Zool. Exped. to Egypt and the "White 



Nile, 1901. Xo. 15. Upsala, 1906. 



LVII. — On some new Forms of Lichens, 

 By Prof. Dr. C. Meeeschkovsky. 



Physciou pulverulenta (Scheb.), Nyl., forma delicata, Mer. 



Thallus mediocris, pallide ochroleuco-cinereiis, nudus vel vix pulverii- 

 lentus, laciniis quasi lit in typo, sed minoribus, tenuioribus. con- 

 cretis, marginibus subcrenulatis, ceiitro ad margines lobulis micro- 

 lihylliiiis luunitis. Apothecia mediocria, vulgo 1-4-1 '8 millim., 

 2-6 haudsuperautes, marginibus tenuibus,8sepe foliosis. — Corticola, 

 supra quercus. 



Spec. orig. in herb. Conservatorii botanici Genevse (vide 

 Tabulae Physcice pulveruJentce). 

 Loc. Geneva (Helvetia). 



