SPLEEN OE LEPIDOSIREN AND PROTOPTERUS. 
241 
PLATE 15. 
Series of diagrammatic figures of transverse sections through the 
embryos of Pro top ter us and Lepido siren, to show the position of 
the spleen with regard to the neighbouring organs. Their numbers 
correspond to those of the lithographic figures, which are drawings of 
the same sections at a higher magnification. 
Pigs. la-4a. — Protop terus. X 20 (circa). 
Figs. 5a-8a. — Lepidosiren. X 10 (exc. 5a X 20). 
PLATE 16. 
Transverse sections through the spleen of Protopterus. 
Fig. 
1 .- 
— N. T. xxxii. 
X 
180. 
Fig. 
2 _ 
— N. T. xxxiii. 
X 
180. 
Fig. 
3.- 
— N. T. xxxiv. 
X 
220. 
Fig. 
4.- 
— N. T. xxxv. 
X 
220. 
PLATE 17. 
Transverse sections through the spleen of Lepidosiren. 
Fig. 5. — N.T. 34. 
X 
180. 
Fig. 6. — N.T. 35. 
X 
180. 
Fig. 7. — N.T. 36. 
X 
180. 
Fig. 8.— N.T. 37. 
X 
180. 
