272 Miscellaneous. 



Zopf's observations, which demoastrate that the same Schizomycete 

 may pass through the phasas of leptothrix, micrococcus, zooglsea, 

 bacillus, &c. 



The Dipteron found abundantly in the midst of the filaments of 

 Beggiatoa could not be exactly determined in consequence of its 

 state of decomposition. I think, however, that it may be referred 

 to Hi/'lrobceims occuUaiis, Fries, a little fly of a dead black colour, 

 I5 millim. in length, which appears in enormous quantities in the 

 early spring, running about and leaping on the surface of the water, 

 Whe:i there is any wind these insects take up their position upon 

 the stems of grasses, from which the wind transports them to the 

 water, where they then form a continuous black layer. It is in 

 part to these flies that we must attribute the black coloration ob- 

 served upon the eastern part of the Lac de Bret. 



From what precedes, it must not, however, be inferred that the 

 waters of the Lac do Bret are insalubrious. The Ber/r/iatoce which 

 occur there are met with in all the sulphurous mineral waters which 

 thousands of people drink every year as remedies. As to the flies driven 

 by the wind upon this water, they are not infectious like those which 

 station themselves upon dead bodies. Moreover, their decomposition 

 is accelerated by the Be(jginto<v themselves, which transform the 

 bodies of these small insects into gaseous matters, in great part set 

 free into the air. 



All round the Lac de Bret at present (April) we find, immersed in 

 the water, green globular masses formed by Algae belonging to 

 Zygaema Vaucheri and Z. cruciatum. — Bulletin de la Societe Vau- 

 doise des Sciences Naturelles, ser, 3, vol. xviii, pp. 152-155 (June, 

 1888). 



On the Calanidse of the Boulonnciis. By M. Ecgkne Canf, 



M. Eugene Canu, of the Zoological Laboratory at Wimereux, 

 published lately the first part of a description of the marine non- 

 parasitic Copepods of the Boulonnais, in which the Calanidae 

 obtained on that part of the French coast are discussed at some 

 length. He follows generally the classification adopted by Mr, G. S, 

 Brady in his Monograph of the British Copepoda. The forms 

 noticed are as follows : — 



Subfamily I. Calanin^. 



1. Paraccdanus parvus, Claus, 



A species not recorded as British, but very abundant at Wimereux, 

 and widely distributed in the European seas. 



2, Bias disraudattis, Giesbrecht. 

 A species originally described from Kiel, and not noticed by 



