GKKVILIJ';, OiN DIATOMACE.i;. Z 



the branch of the inquiry entrusted to my colleagues ; I may, 

 however, obserA'e, that the microscopical examination here 

 detailed would lead to the conclusion that the presence of 

 the Cysticercus in the small numbers which occur in " slightly 

 measled" pork does not appreciably affect the healthy con- 

 dition of the muscular fibre, and that it is only when the 

 numbers of this parasite are considerable that the fatty de- 

 generation and watery condition of the muscles become 

 apparent; and as it further appears that the operations of 

 curing, or cooking, destroy the assimilating powers of the 

 cellules, and consequently the life of the Cysticercus, it 

 woidd seem that no apprehension need be entertained of 

 tape-worm following the use of " measled " pork, provided the 

 Hesh be carefully cured or thoroughly cooked. 



Description of some New Diatomaceous Forms /rom the 

 West Indies. By Robert Kaye Greville, LL.D., 

 F.R.S.E., &c. 



Some months ago I received a box of shells from my friend 

 Mrs. William Eccles, of Trinidad, among which was a small 

 marine species covered with an entangled tuft of sea- weeds 

 and zoophytes. This, as it appeared to contain Diatomacece, 

 I manipidated in the usual way, and on careful examination 

 found it to yield a number of exceedingly interesting kinds, 

 especially if the very small quantity of the prepared material 

 be considered. As it woidd scarcely serve any useful purpose 

 to work out every form which presented itself in a gathering 

 so trifling in extent, I propose to confine myself on the pre- 

 sent occasion to the description of such as seem to be new ; 

 and I shall only mention that among the remaining forms 

 worthy of notice the following were observed : Synedra undu- 

 lata, Bail., S. superba, Kiitz., Cocconeis Orevillii, Sm., Navi- 

 cula Hennedyi, Sm., N. crahro, Eh.,^" Amphora ohtusa and 



* As Professor Smith has not yet given a figure of tliis species, I can 

 only conclude from his description, which most accurately agrees with the 

 form before me, that I am correct in my reference. The figures engraved 

 by Ehrenl)erg, in his ' Microgeologie,' PL XIX, fig. 29, are not satisfactory, 

 especially a and b. The half frustule c, however, is probably the true form, 

 with the faint nioniliform structure of the strite omitted, and the constric- 

 tion far too widely concave. In the absence of authentic materials, I cannot 

 venture to speak with any certainty of Naviculu pandum of De Brebisson, 



