518 F. G. SINCLAIR. 
matter, yet strengthen my opinion that the question is still 
an open one. 
We have in the Myriapod brain a great diversity of form 
in species that have always been considered closely allied. 
The variations in the structure of the nervous system are not 
as St. Remy pointed out allied intimately with the presence 
or absence of the ocular lobe, and therefore the difference 
is a more deep-seated one than can be due to the presence or 
absence of eyes. All these variations, however, keep within 
certain limits, and it is not possible to show as great a 
difference between the Chilopod and Diplopod brain as 
between the brain of Insecta, Crustacea, and Arachnida, and 
that of Myriapoda. I think that all the variations in their 
nervous system are such as might be expected in a large 
group which, though including a great number of different 
forms, yet deserves to be classified in a single class. 
Books REFERRED TO. 
1. Bopr.—‘ Polyxenus lagurus,” ‘Zeitschr. fiir die gesammten Natur- 
wissenschaften,’ Giebel, 1877. 
2. Hermons.—‘ Die Entwickelungsgeschichte der Scolopend,’ Stuttgardt, 
1901. 
3. Newrort.—“On the Class Myriapoda, Order Chilopoda,” ‘Trans. Linn. 
Soc.,’ 1844. 
. SinvestR1,.—‘I Diplopodi,’ Geneva,’ 1$96. 
‘Classis Diplopoda Portici,’ 1903. 
. St. Remy.— Théses,’ 1890. 
Lucas.—“ Sur un nouveau genre de la classe des Myriapodes appartenant 
& la famille des Julides,” ‘Annales de la Société Entomolique de 
France,’ 1843. 
IO oO 
EXPLANATION OF PLATE 29, 
Illustrating Mr. F. G. Sinclair’s paper “On some Points in 
the Anatomy of the Platydesmide. 
LETTERS USED IN ALL THE FIGURES. 
Ant.l. Antennal lobe. Azt.z. Antennal nerve. Ch. Chitin. Fr./. Frontal 
lobe. Gl. Gland. Hy. Hypostoma. WV. ¢. Nerve to organ of Tomdsvary. 
