82 ME. E. B. NEWTON ON FOSSILS FEOM MADAGASCAE. [Feb. 1 89 5, 



Dimensions. — Height = 8 mm. ; extent of hinge-line = 9 mm. 



The adult form of this species has been previously recorded from 

 Iraony. 1 



Horizon. — Oolite (probably Lower). 



Loc. — Antankarana province, on the north-western boundary of 

 the central hill-range. 



Teigonia ptjlltjs, J. de C. Sowerby. (PI. III. figs. 6, 7.) 



This is a sandstone-impression accompanying Pteroperna costatula, 

 Astarte depressa, etc. It is an extremely small form of the species, 

 but is sufficiently marked for identification by the typically strong 

 pallial costse. 



Fig. 7 appears to be a cast of the same species ; it shows the bifid 

 nature of the dental area. 



This species has a wide distribution, having been recorded from 

 the Antalo Limestones of Abyssinia 2 ; from Shoa, 3 S. of Abyssinia ; 

 and from Cutch 4 in India. 



Horizon. — Oolite (probably Lower). 



Loc. — Antankarana province, on the north-western boundary of 

 the central hill-range. 



Teigonia costata, Parkinson. (PI. III. fig. 5.) 



The pallial costae in this specimen appear to be slightly 

 nodulated, but that is due to weathering ; in other respects it 

 corresponds with this species. It also shows the smooth sulcus 

 separating the costae from the marginal carina. 



This species has been recorded from Abyssinia by W. T. Elanford, 

 and from India by J. de C. Sowerby. 



Horizon. — Lower Oolite. 



Loc. — About 3 miles north of Iraony. 



Astaete (allied to) depeessa, Goldfuss (Miinster). (PL III. fig. 8.) 



An impression of a left valve in sandstone, accompanying 

 Pteroperna costatula and Trigonia pullus; showing a strong con- 

 centric ornamentation, an oblique cardinal margin, and a small 

 lunule. It is depressed, and has a length greater than its height. 



Dimensions. — Length = 10 mm. ; height— 7 mm. 



Horizon. — Oolite (probably Lower). 



Loc. — Antankarana province, on the north-western boundary of 

 the central hill-range. 



Mttiltjs madagascaeiensis, sp. nov. (PI. III. fig. 3.) 



Shell cuneiform, depressed posteriorly and elevated anteriorly, 

 producing a narrow convexity, which becomes more pronounced 



1 R. B. Newton, Quart. Joura. Geol. Soc. vol. xlv. (1889) p. 335. 



2 W. T. Blanford, ' Observ. Geol. Zool. Abyssinia,' 1870, p. 179. 



3 Douville, Bull. Soc. geol. Prance, ser. 3, vol. xiv. (1886) p. 226, pi. xii. 

 figs. 13, 14. 



4 J. cle C. Sowerby, Trans. Geol. Soc. ser. 2, vol. v. pt. ii. (1840) p. 328. 



