• Volume 16, Issue 1

      July 1942,   pages  1-24

    • Certain abnormalities in millets induced by X-rays

      N Krishnaswami G N Rangaswami Ayyangar

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      1. Some of the recessive abnormalities induced by X-rays inE. coracana Gaertn. andPennisetum typhoides S. & H. are described.

      2. InE. coracana are described a chlorophyll deficiency in which the first two or three leaves are green and white banded, but the mature plant is fully green and two mutations effecting the panicle. InP. typhoides have been noted gappiness, tip-sterility, forking and goose-necking in the panicle, male-sterility, and weak-midribbed leaves all behaving as recessives.

      3. While some of the plant characters in both these millets mutated easily, others showed no tendency to mutate. Thus inE. coracana the panicle shapes and chlorophyll factors mutated while the grain colour, length of glume and growth factors did not give any mutations, while inP. typhoides the greatest number of mutations were observed in the chlorophyll and panicle characters.

      4. P.typhoides threw out more mutations thanE. coracana and this is adduced to the diploidy of the former and the tetraploidy of the latter.

    • The discoglossid skull

      L S Ramaswami

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      It is clear that the Discoglossid skull exhibits features in which it differs from the Liopelmid. The possession of (1) a limb of the septomaxilla in the plica, (2) a recessus olfactorius, (3) a postchoanally united palatal glands, (4) a Bursa angularis oris, (5) a prefacial commissure, (6) a facial canal in the Discoglossidæ and their absence in Liopelmidæ is sufficient to treat them as irdependent families. The absenee of middle ear, etc., in Liopelmidæ (from the view-point of auditory skeleton, de Villiers, however, considers the Liopelmidæ as not primitive) andBombina can only be explained as due to parallelism since the absence of those structures also occurs in an unrelated genusHemisus.


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