280 THE AMERICAN MONTHLY [Oct 
Cymbella affinis ; gastroides; helvetica; kamchatica Grun.; minus- 
cula Grun.; No. 40 of Sch.9, not named; _stomatophora; tumidula 
turgidula; two small unknown. Denticula splendens. Encyonema 
lunula. Epithemia gibba ; gibba, var. ventricosum; gibberula; like 
musclus, but ends not so sharp; uncertain; zebra. Gomphonema ab-. 
breviatum ; angustatum, var. intermedia: capitatum ; clavatum ; com- 
mutatum, var, subramosum; intricatum, var. pumila; olivaceum ; 
olivaceum, var. vulgaris; ventricosum. Homoeocladia sigmoidea. 
Mastagloa smithii Thw., var. lacustris, Grun. 
Navicula amphiceros (?); bacillum; borealis (var. small, with nine 
coarse striz); brebissonii; cymbula Donk; elliptica; elliptica, var. 
oblongella ; gracilis (Kg.) Grun.; gregaria Donk; interrupta (Pinn.) 
S. W.; lanceolata (Kg.), var.; leptogongyla; longa; macra; mutica, 
var, goeppertiana ; large, coarsely marked, lanceolate, unknown ; No. 
11 of Schmidt’s 47, not named ; No. 13 of same, not named; No. 15 of 
same, not named; No. 22 of Schmidt’s 44, but rather coarser; No. 32 
of Schmidt’s 44, with some reserve; obtusata; pumila Grun.; radiosa 
Kg.; radiosa, var. acuta; rhomboides, var. (Colletonema vulgare Thw.); 
rupestris (Pinn.) Grun.; smithii(?); subcapitata, var. stauroneiformis ; 
subinflata ; stauroptera ; stauroptera parva Grun.; tabellaria ; tenella; 
unknown, perphaps naveana(?), 
Nitzschia amphioxys, var. vivax ; angustata ; frustulum ; heufleriana; 
hungaricum; sigma; stagnarum Rabh.; triblionella. Pleurosigma 
gracilentum Rabh.; spencerii; sciotense ; kutzinghii. Synedra acus; 
crotonensis; danica ; familiaris ; an end of, perhaps. Chaseii(?); pulchella, 
forma major ; ulua.—Total genera, 16; species, Loo. ; 
Notes on Microscopy. 
F. SHILLINGTON SCALES, F, R. M. S. 
PREPARING SMALL MARINE INVERTEBRATES.—The fol- 
lowing method of preparing small marine invertebrates 
for microscopic study may be of service to some of our 
readers. It was originally contributed to the ‘Journal 
of Applied Microscopy” by Mr. H. P. Johnson, the aim 
being to retain as fully as possible the natural form, 
transparency, and coloring, and at the same time to have 
the specimen instantly accessible for re-examination. The 
specimen is placed on a slide in a few drops of pure sea 
water, and slightly compressed with a cover-glass pro- 
vided with wax feet. The compression can be quite ac- 
curately regulated by pressing down the wax feet at the 
