BULLETIN OF THE BUSSEY INSTITUTION. 191 
Ill. F. G. Old shells of crawfish, respectively 6.5 and 5.4 cm. long, that 
were about to be shed, a new thin cell having already formed beneath them. 
Weiske, as in III. A. 
III. H. New shell of crawfish, that was forming under the old shell of III. G. 
Weiske, as in III. A. 
All these specimens —III. A. to H. — contained traces of magnesia. 
IV. Claws of the crawfish (Arebsscheeren). Goebel and Pagurus, Schweigger’s 
“ Journal fiir Chemie und Physik,” 1828, 39. 440. 
VY. The glossy brown points on crawfish claws and the so-called crab’s teeth 
(Krebszdhne). Goebel and Pagurus, as above. 
See, further, Schmidt’s analysis of the ash of the shell of the crawfish, 
page 179. 
VI. Shell of the crab (? Cancer pagurus), called Taschenkrebs in German. 
Chevreul, cited in Schweigger’s Journal, as above, under No. I. 
VII. Shells of Lepas levis. C. Schmidt, “ Annalen der Chemie und Pharma- 
cie,” 1845, 54. 317. 
VIII. Shells of the European oyster (ostrea edulis). How, “ American Journal 
of Science,” 1866, 41. 379. Beside the items in the table, he found 0.800 and 
0.809 % sulphuric acid, and 0.039 % ferric oxide. 
IX. Different parts of the oyster-shell, as follows : — 
A. The inner lustrous pearly layer of the shell. 
B. Hard brown scales from borders of the laminez upon the outermost part 
of oyster-shells. 
C. Dull, chalky, friable matter from spaces between the lamin of the oyster- 
shell. Schlossberger, “ Annalen der Chemie und Pharmacie,” 1856, 98. 101. 
X. Shell of the European mussel (J/ytilus edulis). How, as cited under No. 
Vill. He found, also, 0.55% sulphuric acid, and 0.036 % ferric oxide. 
XI. Mussel-shells. Reichardt, Wilda’s ‘“‘ Centrallblatt,” 1859, 7. (II.) p. 421. 
These shells gave off 0.58 % of water on being heated. 
XII. Shell of the garden or vineyard snail (Helix pomatia). Gobley, “ Journal 
de Pharmacie et de Chimie,” 1858, 33. 161. He found traces of magnesia and 
ferric oxide also. 
XIII. A. Snail-shells, as in XII. B. Wicke, “ Annalen der Chemie und Phar. 
macie,” 1863, 125. 79. He found 0.467 % of magnesia also. 
XIII. B. Operculum of the garden snail. B. Wicke, asin XIII. A. Beside 
the items in the table, he found 0.457% of magnesia, and 0.085% ferric oxide 
For W. Wicke’s analysis and remarks upon the operculum of the snail, see the 
note on page 192. 
XIV. Snail-shells, as in XII. Joy, ‘“ Annalen der Chemie und Pharmacie,”’ 
1852, 82. 367. 
XV. Shells of Helix nemoralis, dried at 120°C. Schmidt, “ Annalen der 
Chemie und Pharmacie,” 1845, 54. 313. He noted a trace of magnesia also. 
XVI. Shell of the European periwinkle (Littorina littorea). How, as cited 
under No. VIII. He found 0.282 and 0.283 % of sulphuric acid also. 
XVII. Shells of the common cockle of Europe (Cardium edule), Phipson, 
“Report British Association,” 1859, p. 77. He found also a trace of potash, 
0.18 % of magnesia, 0.2 % of sulphuric acid, 0.41 % of ferric oxide, and 1.10% of 
water. 
XVII. Shells of Anodonta, dried at 120° C. Schmidt, “ Annalen der Chemie 
und Pharmacie,” 1845, 54. 313. 
