Vol. 51.] ME. E. B. NEWTON ON FOSSILS FROM. MADAGASCAR. 85 



d'Orbigny. This differs from the Malagasy shell in being much 

 more trigonal in shape, in its possession of a more angulated space 

 beneath the umbones on the escutcheon, and in having slightly 

 recurved umbones. 



Horizon. — Oolite (probably Lower). 



Loc. — About 2 miles south of Andranosamonta village. 



PsEUDOTRAPEZIUM DEPRESSTJM, Sp. IIOV. (PI. III. figS. 11, 12.) 



Shell with valves in contact, and differing from the last species 

 in being much more depressed, in having a greater height and 

 length, and in possessing a narrower and dorsally angulated 

 escutcheon area ; it has a similar concentric ornamentation. 



Dimensions. — Height =31 mm.; length =45 mm.; breadth = 

 17 mm. ; escutcheon = 29 x 12 mm. 



Horizon.- — Oolite (probably Lower). 



Loc. — About 2 miles south of Andranosamonta village. 



PsETTDOTRAPEZIT/M ELONGATUM, Sp. nOV. (PI. III. figS. 13, 14.) 



This specimen appears to be distinct from the other two species 

 in its smaller dimensions. It has the narrow and dorsally angu- 

 lated escutcheon area, but possesses a sharper and rather more 

 trigonal contour. 



Dimensions. — Height=20 mm.; length = 35 mm.; breadth = 

 15 mm. 



Horizon. — Oolite (probably Lower). 



Loc. — About 2 miles south of Andranosamonta village. 



Brachiopoda. 

 Rhynchonella (allied to) plicatella, J. de C. Sowerby. 



This species has been already recorded from near Ankoala. 1 

 Horizon. — Jurassic. 



Loc. — Hill-range between the River Lokia or Loquez and the River 

 Rodo, north-east coast. 



Rhynchonella (allied to) concinna, J. Sowerby. 



[British, European, and Indian.] 



Horizon. — Lower Oolite. 



Loc. — About 3 miles north of Iraony. 



Plantse. 



There are some obscure plant-remains in a lignite of uncertain 

 age obtained from Ambavatoby on the west coast. This lignite is 

 probably Cretaceous or Jurassic, and has been noticed ' as older than 

 Tertiary ' (Annales des Mines, ser. 5, vol. vi. 1854, pp. 570-576) ; 



1 R. B. Newton, Quart. Journ. Geol. Soc. vol. xlv. (1889) p. 337. 



