Volume 23, Issue 1
January 1946, pages 1-73
pp 1-38 January 1946
The present account is a continuation of work undertaken a few years back by the author.
For the first time a detailed account of the external morphology of an Indian Galerucid beetle has been attempted.
Evidence has been brought forward to show that Lefroy did describe this species under the provisional name Galerucella singhara and also gave an account of its life-history. Hence Maulik’s observation that Lefroy never described any such species is not correct.
Only five species of the genus Galerucella have so far been described from the Indian region.
It has been found that the mesoscutum which is generally regarded as being split into two separate plates in Coleoptera is one continuous plate in this species and is covered along its middle by the meso-scutellum.
The wings are much folded. Their folding pattern and venation has been described in detail.
In the male only seven abdominal sternites could be seen and the ædeagus is neither provided with lateral lobes nor there is the development of tegmen.
In the female nine tergites and nine sternites can be seen.
There is no marked sexual dimorphism.
pp 39-51 January 1946
pp 52-57 January 1946
A hydrostatic model is described to explain adaptation in unstriated muscle.
pp 58-72 January 1946
Unstriated, cardiac and striated muscles show differential action of substances on the excitability to electrical stimulation and potassium.
The response to nervous stimulation and acetylcholine may be similarly or oppositely affected.
Muscle shows adaptation to temperature.
Tonus may be shown by three kinds of muscle; one kind of tone in unstriated muscle is similar to the contracture of striated muscle.
In all the three kinds of muscle, twitch is antagonistic to contracture; a synergistic contracture also occurs.
In some instances, there is a gradation in the properties of unstriated, cardiac and striated muscles.
Adaptation to electric current is more rapid in unstriated than in striated muscle.
Many drugs and ions act similarly on the three kinds of muscle.
Many agencies affect excitation and inhibition similarly.
The properties ofMytilus muscle and the motor end plate of striated muscle are in many respects similar.
pp 73-73 January 1946 Erratum