284 DR. C. T. TRECHMANN ON THE [vol. lxxix, 



Kitchin, 1 or some closely-allied form. Dr. Kitchin, in a letter to- 

 Mr. Buckman, concurs with this suggestion. 



One specimen (fig. 2) agrees in some respects with Kitchin's 

 pi. xi, fig. 4 ; hut, in the New Zealand specimen, the dorsal valve 

 is regularly rounded, and not flattened towards the umbo as it is 

 in Rhynchonella pulcherrima. The Indian form is confined to 

 the upper beds of the Putchum Group (Bathonian), where it is- 

 said to occur in great profusion. 



Terebratttla (Kutchitiiyris) cf. acutiplicata Kitchin. (PI. 

 XVI, figs. 5-7.) 



1900. ' Jurassic Fauna of Kutch : Brachiopoda ' Pal. Ind. ser. 9, vol. iii, 

 pt. i, p. 6 & pi. i, figs. 1-7. 



Description. — Outline subovoid or suhpentagonal, in most 

 specimens rather longer than wide, in others the length is equal 

 to the width. The ventral and dorsal valves are about equally in- 

 flated, the dorsal sometimes rather more so than the ventral. Beak 

 rounded, not very prominent, projecting slightly over the dorsal 

 valve; the aperture encroaches on the umbo, almost concealing the 

 delthyrium of the ventral valve. The dorsal valve has two pro- 

 minent rather angular folds, which start from the anterior margin, 

 and pass to ahout midway between the anterior margin and the 

 heak, where they disappear in the rounded surface of the valve. 

 They enclose a more or less deep sulcus, and are bounded by broad 

 lateral sulci. On the ventral valve a median fold corresponds to 

 the median sulcus of the opposite valve, with a broad sulcus on: 

 each side of it, and on each side of these is a rounded fold. All 

 these folds and sulci disappear rather more than half-way from the 

 anterior margin to the beak. Growth-lines are rather coarse and 

 irregular at first, but become more prominent, regular, and closely 

 set towards the anterior margin of fully- grown shells. 



Dimensions. — Length = 34 mm. ; width=31 mm.; thickness 

 =about 16 mm. Another specimen is 34 mm. long and wide, and 

 about 21 mm. thick at the greatest diameter. 



Locality. — Totara Point, Kawhia. I collected several speci- 

 mens, some of which are more or less crushed and distorted, a 

 process that often accentuates the folding of the shell. 



Remarks. — Mr. Buckman writes, regarding three specimens 

 that I submitted to him, that his genus Kvtcliithyris 3 is founded 

 on Kitchin's species Terebratula acutiplicata, to which the New 

 Zealand specimens have a most remarkable resemblance. He' 

 remarks that the short beak approximate to the umbo is charac- 

 teristic of Ktitchithyris. Most of the specimens of this anteriorly 

 biplicate New Zealand shell resemble that figured by Dr. Kitchin 

 in his pi. i, figs. 1-3. One specimen (fig. 6) is more acutely 

 biplicate, a feature which does not seem to be entirely due to 



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

 (1900) p. 52 & pi. si, figs. 1-9, 16. 



2 Eec. Geol. Surv. India, vol. xlv (1915) p. 78. 



