"Daphnia. E., Eye; A.2, second antenna; A.1, first antenna; dg., digestive caeca; s.g., shell gland;…
Diagram of a longitudinal section of an embryo, showing the different areas of the blastodermic vesicle.…
View of the heart enclosed in its bag, or pericardium, which is a serious membrane. It is here laid…
Diagram of a developing ovum, seen in longitudinal section. Labels: a, pericardium; b, bucco-pharyngeal;…
"View from below of a scorpion (Buthus occitanus) opened and dissected so as to show the pericardium…