28 On some Jurassic Mollusca from Arabia. 



Madagascab. 



Lemoine, P. Etudes Geologiques dans le nord de Madagascar, 1908, 



pp. 146, 147. 8vo, Paris. 

 Newton, R. B. Notes on Fossils from Madagascar &c. Quart. 



Journ. Geol. Soc. 1889, vol. xlv. p. 334. 

 . On a Collection of Fossils from Madagascar obtained by the 



Rev. Pi. Baron. Quart. Journ. Geol. Soc. 1895, vol. li. pis. ii. & 



iii. pp. 72-82. [Contains list of all the recognized fossils from 



Madagascar.] 



EXPLANATION OF THE PLATES. 



Plate I. 



Parallelodon egertonianus, Stoliczka, sp. (Page 5.) 



Fig. 1. External lateral view of a left valve. 



Fig. 2. Interior of the left valve of another specimen, showing partial 



dental characters. 

 Fig. 3. Magnified view of external surface-structure. 

 Fig. 4. Dorsal aspect of a smaller specimen with both valves. 



Nucxda cuneiformis, J. de C. Sowerby. (P. 7.) 



Fig. 6. Dorsal view of specimen with both valves. 



Fig. 6. Internal section of another specimen with both valves, showing 



dentition. 

 Fig. 7. Posterior end of another form with both valves, showing the 



wide lunule, x 2. 



Trochus arabiensis, sp. n. (P. 8.) 



Figs. 8, 9. Views of separate specimens, fig. 9 being more inflated at 

 the base. 



Nerinesa cf. desvoidyi, Orbigny. (P. 9.) 

 Fig. 10. Natural cast, showing the median excavation of the whorls. 



Plate II. 



Fig. 1. Belemnites cf. hastatus, Blainville. 1 a, ventral aspect, exhibiting 

 the narrow ventral groove, widening out and becoming shal- 

 lower at the posterior end ; 1 b, view of anterior end of the 

 same specimen ; 1 c. view of posterior end of the same. The 

 specimen is labelled " Nobat.' : (P. 19.) 



Fig. 2. Nautilus cf. hexagonus, J. de C. Sowerby. Lateral aspect, 

 showing subangular margin of periphery and the growth-lines 

 of the test. Near the villages of Al-Kura and Samma, 

 15 miles N.E. of Dihala. (P. 11.) 



Fig. 3. Perisjjhiyictes cf. subdolus, F. Fontannes. Lateral aspect of 

 specimen, the inner whorls of which are obscured by matrix. 

 Near the villages of Al-Kura and Samma, 15 miles N.E. of 

 Dihala. (P. 17.) 



