Serological prevalence and isolation of Babesia odocoilei among white-tailed deer (Odocoileus virginianus) in Texas and Oklahoma.

Serum samples collected from 581 white-tailed deer (Odocoileus virginianus) from Texas and from 124 white-tailed deer from Oklahoma were tested by the indirect fluorescent antibody technique against Babesia odocoilei. Prevalence of seropositive reactors varied from site to site in both states. Prevalence rates were statistically ranked as high, intermediate or low.

Head-kidney thyroid in some Indian teleosts.

Six species of fishes, with different habits and belonging to different habitats and families, have been investigated. Only four, namely Discognathus lamta, Carassius auratus, Glossogobius giuris and Polynemus sexfilis have shown the presence of heterotopic thyroid follicles in their head-kidneys. The heterotopic thyroid follicles of Discognathus lamta appear to be functional while those of the rest of fishes are in non-functional state.

Caudal neurosecretory system and the neurohemal organ of Tor tor (Ham.).

The Caudal neurosecretory system and the neurohemal organ of a fresh water fish, Tor tor, is described. In this fish the neurosecretory system is well developed which extends upon an stretch of the last 6--7 caudal vertebrae. This region of the spinal cord is characterised by the presence of large Dahlgren cells.

Histo-physiological studies on the interrenal gland of a catfish, Clarias batrachus (Linn.).

The effects of three drugs namely, reserpine, atropine, and adrenaline have been investigated on the interrenal gland of Clarias batrachus. All the drugs bring about lesser or greater degree of hypertrophy in the interrenal gland of this fish. Atropine exhibits more vigorous effect than reserpine and adrenaline.

Thyroid follicles in the head-kidney of teleosts.

Out of five species of fishes, selected for this investigation, only two have shown the presence of thyroid follicles in their head-kidneys. In Tor tor the thyroid follicles are larger than those of Cyprinus carpio. They are elliptical in shape in T.

Heterotopic thyroid follicles in the accessory mesonephric lobes of Heteropneutes fossilis (Bloch).

The presence of heterotopic thyroid follicles is reported in the accessory mesonephric lobes of Heteropneustes fossilis. They are found rarely and singly, scattered in the substance of these lobes, in the early stages of development; but in the adult organ they occur in groups. There is no regular distribution and proper arrangement of these follicles.