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The light microscopic of Corpus luteum and the different cell types in the functional corpus luteum of the bat were studied. Two types of luteal cell,a large and small, were present in the corpus luteum of this species of bat. The large more rounded luteal cell. Cytoplasm is granular and vacuolizations are observed in most of the cells The luteal cells are compactly arranged and show moderate hypertrophy. Nuclei are distinct and darkly stained with Chromatin clumps. During late pregnancy luteal cells are shrunken. Intracellular spaces in the corpus luteum have increased. Small vacuoles are also seen in the cytoplasm of the luteal cells. The process of luteolysis has been initiated in the luteal cells Small luteal cell present amongs the large luteal cells with tapering cytoplasmic processes.

The thyroid gland has long been recognized as an important modulator of reproductive function. Both hyper- and hypo-thyroidism are associated with reproductive dysfunction and infertility. In addition, thyroid hormones appear to play a key role in the expression of events that underlie seasonal reproductive cycles. Despite the considerable information is available on the histology of thyroid gland in some of the bats, literature related to study is very few, and further information available on the ultrastructure is also scanty. The specimen of Taphozous kachhensis was collected from Ambai Nimbi. Many collections were made during the breeding season so as to coincide with the time of reproductive cycle and to get an accurate pregnancy record. Thyroid is removed from the bat and cut into 1–2 mm piece and immersed in fresh ice-cold 3% gluteraldehyde solution for 2–4 h and send for further process. The thyroid gland is more active during estrus than the pregnancy and lactation. The cell organelles observed in follicular cell of thyroid gland indicate more synthetic activity. While during pregnancy and lactation the thyroid gland is not synthetically active but the appearance of more lysosomal bodies during pregnancy indicate the utilization of stored colloid and release of thyroid hormone in blood stream. The parafollicular cells are more developed during pregnancy and lactation than estrus as indicated by ultrastructural characteristics. These cells may secrete calcitonin, serotonin, and somatostatin and may be responsible for controlling the seasonal changes in plasma calcium concentration in this bat.

The ultrastructure of Corpus luteum and the different cell types in the functional corpus luteum of the bat were studied using the electron microscope. Two types of luteal cell, a large and small, were present in the corpus luteum of this species of bat. The large more rounded luteal cell possessed numerous cell organelles such as mitochondria and electron dense membranebound granules, agranular endoplasmic reticulum and granular endoplasmic reticulum which at times appeared as stacks of cisternae. With this lipid droplets were present in the luteal cell cytoplasma while whorled agranular endoplasmic reticulum was absent. Small luteal cell present amongs the large luteal cells with tapering cytoplasmic processes. These cells differed from the large luteal cells in that they possessed fewer mitochondria and electron dense membrane- bound granules. Occasional nuclei of the small luteal cells contained cytoplasmic inclusion bodies