It's a Calpionellid. I guess the section is from the lowermost Cretaceous.

I would agree that the first one is a Calpionellid, in shallower waters it might also be an ostracod shell. In the second one planktonic foraminifera can be seen.

Thanks for your comments regarding my question but the sample is from Upper Cretaceous Pelagic limestone as the age has been inferred from the foraminifera by previous workers.

Venus Guruaribam the Calpionellids are limited to the upper Tithonian-lower Valanginian. Are you sure it's Upper Cretaceous?

I am not sure about this that's why I put up the question? to confirm that whether it is a calpionellids or not, but the thing is that It is rarely found in my slide so giving the age will have problem. Previous worker has marked it as Upper Cretaceous base on foraminifera but they have not given any report regarding the presence of calpionellids. .

I think you should check the planktonic forams as well.

I agree with previous comments. It is for sure a calpionellid. It either may be reworked, or the age based on planktonic foraminifera is not correct. They should be re-checked.