310 REPORT— 1903. 



The following species have been found on new hosts, viz. : — 



Jiopyroides .tarsi. Bonnier, on Spironto- P. Hyndmanni (B. k. W.) on Anajmgurus 



caris seourifrons, Norman. Levis (Thomp.) 



I'seudione crenulata, G.O.Sars, on Gala- Atheleges pafivri (Rathke) on A. Irevis^ 



thea dltpersa, Bate. and on Ewpagurus Prideanxii (Leach). 



Another species, A. Prideaiixii, Giard and Bonnier, has been found 

 on the last-named species of decapod ; but Stebbing says ' that 'the adult 

 female retains a rudimentary fifth pair of appendages on the pleon which 

 are transitory on the former'- — i.e. on A. jictyuri. In my specimens, how- 

 ever, which seem to be fully matured, there are only ybMr pairs, and the 

 form of the two plates of which each appendage consists is exactly the 

 same as in A. jmguri. I have shown these specimens to Dr. Scott, and 

 he has referred them to A. paguri, and on this point I fully agree with 

 him. 



Phryxvs ahdominalis (Kr.) on Spiruntocaris jmsiola (Kr.) ; ;S'. Crancldi, Leach • 

 and S. Gaiviardii (Milne- Ed w.) 



I have not completed my survey of the Ctimacea and Amphipoda, but 

 hope to publish the results at an early date. 



The Committee ask for a renewal of the grant of 25^. given in 1901, to 

 enable Mr. R. T. Leiper to investigate the Accelous Turbellarians of the 

 Millport area and to enable Mr. D. C. Mcintosh, M.A., to work at 

 Variation in Ophiocoma granulata (O. F. Miiller) and other Echinoderms, 

 and to enable Mr. Alex. Patience to continue his investigations on the 

 Crustacea of the Clyde sea-area. 



The Committee ask to be reappointed, with the addition of Professors 

 J. Arthur Thomson and J. Graham Kerr. 



The Micro-chemistrij of Cells. — Report of the Committee, consistinr/ of 

 Professor E. A. Schafer (Chairman), Professor A. B. Macallum 

 (Secretary), Professor E. Eay Lankester, Professor W. D. 

 Halliburton, Dr. G. C. Bourne, and Professor J. J. Mackenzie. 

 (Drawn up hi/ the Secretary.) 



The Committee report that the work of detecting and localising calcium 

 and potassium in the vegetable cell, which was begun in 1901-2, was 

 continued, and that in regard to potassium results of importance were 

 obtained which may have a bearing also on the interpretation of the role 

 of sodium, magnesium, and calcium in the living cell, both animal and 

 vegetable. 



The Localisation of Potassium hi the living Cell. — It was found possible 

 to precipitate potassium as the hexanitrite of potassium and cobalt, which 

 occurs in minute octahedral crystals if the potassium salt is present in con- 

 siderable quantities in the living protoplasm, but in a diflfuse form if it obtain 

 only in traces. The reagent used to effect this is the hexanitrite of cobalt 

 and sodium, Na3CO(N0.2)G, and when dissolved in a diluted solution of 



' ^t History of Crustacea, Int. Sci. Series, vol. 74, p. 409. 



