SOME POINTS IN THE ANATOMY OF THE PLATYDESMIDH. 519 
Oc. !. Ocular lobe. O. x. Ocular nerve. Cs. sophagus. Cis. com, Miso- 
phageal commissure. Jr. com. Transverse commissure. S. Depression in 
brain corresponding to marks in external chitin. Sp. Perforated bristle. 
Fie. 1.—Dissected brain of Craspedosoma polydesmoides, 
Fig. 2.—Dissected brain of Spharopeus modigliani. 
Fie. 3.—Dissected brain of 8. evansi. 
Fic. 4.—Dissected brain of Platydesmus mexicanus. 
Fic. 5.—Section through head of P. mexicanus, showing organ of Tomés- 
vary. 
Fig. 6.—Section through head of P. mexicanus, in region of antennal 
lobe. 
Fig. 7.—Section through brain of P. mexicanus, showing cesophageal 
commissure and transverse commissure. 
Fie. 8.—Organ of Tomésvary shown from the outside. 
Fie. 9.—Section of hypodermis in organ of Tomésvary under high power. 
Fie. 10.—Section through brain of Craspedosoma polydesmoides, 
showing transverse commissure. 
Fic. 11.—Section through dorsal plate of P. mexicanus, showing inter- 
calated plate. 
Fic. 12.—Section through dorsal plate of Craspedosoma polydes- 
moides. 
Fie. 13.—Section through dorsal plate of P. mexicanus. 
Fic. 14.—Mandible of P. mexicanus. 
Fic. 15.—Both mandibles of P. mexicanus in situ on the hypostoma. 
Fie. 16.—Head of P. mexicanus. 
Fic. 17.—Ventral plate of P. kelantanicus, 
Fie. 18.—Ventral plate of P. mexicanus. 
Fic. 19.—Ventral organ of P. kelantanicus. 
Fic. 20.—Tracheal opening of P. kelantanicus. 
