part 3] jtieassic bocks of new Zealand. 285 



crushing, and it recalls in this respect Kitchin's fig. 6. In the 

 Indian examples the ventral valve is said to be always more 

 convex than the dorsal; but this does not seem to be the case with 

 all the New Zealand specimens. 



In Kutch this species is confined to the Upper Putchum Beds, 

 where it occurs in great profusion. 



Teeebeatula (Heimia ?) sp. (PL XVI, figs. 4« & 4 b.) 



Description. — Outline ovoid, rather longer than wide. Beak 

 not prominent, incurved but not bent over the dorsal umbo, 

 although apparently it hides the delthyrium. The valves are 

 about equally convex. Surface smooth, except for the growth- 

 lines. The dorsal valve has its greatest convexity rather less than 

 half-way from the anterior margin to the beak, and neither valve 

 bears any plication ; consequently the junction of the valves lies 

 in one plane. Shell thin. 



Dimensions. — Length = 24 mm. ; width= 21 mm. ; thickness 

 = 10 mm. 



Locality. — Lower slopes of Flag Hill, Hokonui Hills. In 

 sandstone. Callovian (?). 



Remarks. — I have two specimens: that figured, and another 

 one much elongated through crushing. Neither bears the test, 

 but part of the impression remains in the rock. Mr. Buckman 

 writes of the specimen, that it bears a considerable likeness to 

 T. plant convex -a Kitchin l ; but it is doubtful whether the New 

 Zealand example has the necessary convexity of the ventral valve, 

 although crushing may have destroyed this. T. planiconvexa 

 occurs in the Upper Putchum Beds of Jumara in Kutch. 



Spibifebina (?) sp. (PL XVI, figs. 11 a & 11 1.) 



Description. — The ventral valve is semipyramidal in shape, 

 with a flat and high triangular area striated or grooved parallel to 

 the hinge-line. The hinge-teeth are strong, and are supported by 

 two strong dental plates, which seem to join the median septum ; 

 this is thin and sharp, and extends for about half the length of the 

 ventral valve. The delthyrium is triangular and open. There is 

 a faint, broad, shallow, median sulcus, and on each side of it are 

 four or five faint ribs, which radiate from the beak to the anterior 

 and lateral margins. The shell seems to have been thin, but is 

 dissolved away, so one cannot ascertain whether its structure was 

 punctate or not. The surface has two or three well-marked 

 growth-interruptions, and was covered with spines, some rather 

 large but most of them small, the impressions of which are seen 

 with a lens on the mould. The dorsal valve is missing. 



Dimensions. — One specimen, a ventral valve, is 6 mm. long> 

 11 mm. wide, and the area is 4 mm. high. Another larger speci- 

 men, the cast only of a ventral valve, is 14 mm. long and 20 mm. 

 wide. 



1 ' Jurassic Fauna of Kutch : Brachiopoda ' Pal. Ind. ser. 9, vol. iii, pt. i 

 (1900) p. 15 & pi. iii, figs. 4-5. 



