80 ME. E. B. NEWTON ON FOSSILS EEOM MAD AGASCAE. [Feb. 1 89 5, 



whom we are indebted for the earliest published figures of Jurassic 

 fossils from Madagascar. 



Horizon. — Oolite (probably Lower), from the same rocks as those 

 which contain Steneosaurus Baroni. 



Loc. — Andranosamonta village. 



Lamellibran chiata. 



Peena oeientalis ?, C. E. Hamlin. 1 (PI. II. figs. 4, 5.) 



So far as can be judged from the figures and description of this 

 species from Syria, Mr. Baron's specimens appear to have somewhat 

 similar characters. The sinuated anterior margin, the oblique 

 hinge-line, and the strong anterior convexity of the valves are 

 prominent features of this shell. Unfortunately the hinge-areas of 

 the Malagasy shells are somewhat obscure, so that it is difficult to 

 trace the extensive series of ligamental characters so typical of the 

 Syrian form ; the specific name is therefore queried. 



Dimensions of specimen with valves in contact. — Height=50 mm. ; 

 length = 33 mm. ; breadth = 33 mm. 



Horizon. — Lower Oolite. 



Loc. — About 3 miles north of Iraony. 



Peena latoconvexa, sp. nov. (PI. II. figs. 6, 7.) 



Shell oblong, subquadrate, broadly convex, rugose; cardinal 

 margin horizontal, incurved, and of medium length ; umbo acute and 

 curved anteriorly ; anterior margin concave beneath the umbo 

 (= byssal orifice) and afterwards nearly straight ; posterior margin 

 curved and depressed ; hinge-area obscurely showing the ligamental 

 pits and ridges ; surface ornamented with a few coarse lines of 

 growth. 



Dimensions. — Height = 67 mm. ; length = 48 mm. ; depth 

 = 15 mm. 



(■a. This specimen consists of an external surface of a right valve, 

 with a somewhat fractured posterior margin. It appears to have 

 relations with Perna quadrata, Phillips, 2 and with Perna rugosa, 

 Miinster. 3 Both these species, however, are more or less angulated 

 and flatter ; they possess a deeper concavity beneath the umbones, 

 and have rounder anterior margins. 



Horizon. — Oolite (probably Lower), from the same rocks as those 

 which contain Steneosaurus Baroni. 



Loc. — Andranosamonta village. 



Geevillia ieaonensis, sp. nov. (PI. II. figs. 8, 9.) 



Shell thick, ovately oblique, anteriorly twisted ; both valves 

 convex, the left one more so than the right ; hinge-area thick, 



1 ' Syrian Molluscan Fossils,' Mem. Mus. Comp. Zool. Harvard, 1884, p. 59, 

 pi. vi. fig. 1. 



2 ' Illustrations of the Geology of Yorkshire,' 1829, pi. ix. fig. 21. 



3 Goldfuss, 'Petrefact. Germanise,' 1836, vol. ii. p. 105, pi. cviii. fig. 2. 



