152 NOTES AND MEMORANDA. 



surrounding matters, with condensation of oxygen on one hand, and on 

 the other the production of carburetted and phosphuretted hydrogen 

 when the medium contains phosphates. 



When the oxidizing power of the ferments is considered, it is seen 

 tbat these hydrogenous products are burnt in proportion as they are 

 formed, and thus the phosphorescence is explained. 



All the facts observed prove that the phosphorescence of the 

 lobster is due to an analogous fermentation. This is confirmed by 

 the fact that the ferment of the phosphorescence is destroyed by the 

 putrid ferment in the same way as the vibrions of putrefaction stifle 

 the bacteria of anthrax. 



Species of Marine Crustacea in Lake Erie. — At the meeting of 

 the Buffalo Microscopical Club, of the 10th November last. Professor 

 D. S. Kellicott communicated a note on the discovery of a species of 

 marine Crustacea in the waters of Lake Erie. He had captured a 

 species of Mysis in the hydrant water, thus confirming the previous 

 detection of these creatures in the waters of the great lakes by 

 Stimpson and Hoy.* 



It is not stated whether the species is 3Iysis relicta, which is well 

 known to inhabit the fresh-water lakes of Norway and Sweden as 

 well as America. 



Professor Kellicott also stated that the body of the Mysis was 

 covered with a marine Protozoa, Acineta tuherosa, a matter interesting 

 in connection with the fact recently mentioned by Professor H. L. 

 Smith,! of the occurrence of marine forms of diatoms in the waters 

 of the lakes. 



Gigantic Isopod of the Deep Sea. — Professor Alexander Agassiz 

 has sent to M. A. Milne-Edwards the Crustacea collected by him in 

 December, 1877, from dredgings in the Gulf Stream between Florida 

 and Cuba. Amongst them was an Isopod obtained at 955 fathoms, 

 which was remarkable not only by its relatively enormous dimensions, 

 9 inches X 4 inches, but by the sj)ecial arrangement of its resj)iratory 

 apparatus, which is very different from that of all other known 

 Crustacea. M. Milne - Edwards proposes to call it Baihynomus 

 giganteus.'l 



It would seem that the respiratory apparatus of an ordinary 

 Isopod is insufficient for the physiological wants of Batliynomus, and 

 that it requires special apparatus of much greater functional power. 

 The false abdominal feet which ordinarily constitute the branchial 

 apparatus, only form in Batliynomus a kind of opercular system 

 under which are found the true branchiae. These taken separately 

 resemble small branching tufts or plumes growing out of stems 

 which divide more and more and form long hair-like filaments. 

 When examined with a magnifying glass it is seen that they form a 

 certain number of distinct branches more or less developed, and 

 that each of these branches arises from or grows out of a tubular 



* ' Amer. Jour, of Microscopy,' vol. iii. (1878) p. 284. 



t See this Journal, vol. i. p. 368. 



X 'Comptes Reudus,' vol. Ixxxviii. (1879) p. 21. 



