Volume 5, Issue 2
February 1937, pages 33-93
pp 33-44 February 1937
From the foregoing discussion it would appear that the classification of digenetic trematodes has been based on their morphological characters. Of these only those characters which are present both in the larvae as well as in adult should be considered of primary importance in the classification. Other characters whose values have already been discussed may be considered individually on their own merits.
pp 45-47 February 1937
pp 48-56 February 1937
pp 57-63 February 1937
The structure and development of the gynœcium, ovule and embryosac ofCocculus villosus DC. has been studied.
There are generally three fertile carpels in a flower, but a fourth one is frequently present. The extra carpel is generally abortive. The carpels are arranged in a spiral manner on the floral axis. In the beginning two ovules develop in each carpel. Later the lower one of these is suppressed. These observations show that the few-carpellary gynoecium ofCoccufnts villosus has been derived by reduction from a multicarpellary structure and the uni-ovular carpel from a bi-ovular type.
The functional ovule is amphitropous up to the development of the embryo-sac, but becomes campylotropous during the formation of the endosperm. There are two integuments, which remain free from each other and the nueellus up to the mature embryo-sac stage. The micropyle is formed only by the inner integument. The nueellus is characterised by the development of a small epidermal cap.
The primary archesporium is restricted to a single cell. A primary wall cellos cut off. The megaspore mother cell gives rise to a linear tetrad of megaspores. The chalazal megaspore alone is functional. The development of the embryo-sac corresponds to the normal type. The polar nuclei fuse at an early stage. The synergids possess small hooks and show a clear filiform apparatus in the later stages. The antipodal cells develop large vacuoles.
pp 64-75 February 1937
It is suggested that the genesOpecœlus Ozaki comes closer toPodocotyloides Yamaguti, than to the genusPodocotyle.
Two new species of Opegaster, O.mastacembalii and0. mehrii from the fresh-water eelMastacembalus armalus are described; and the specific diagnosis of0. mastacembalii is given. For convenience of treatment a detailed description ofO. mehrii is avoided. A key to the species of the genusOpegaster is given.
In the concluding part of the paper it is pointed out that the familiesOpecœlidæ andCoitocæcidæ should be dropped and all the genera contained therein be included in the sub-familyOpecœlinæ which Manter includes in the familyAllocreadiidæ. The definition of the sub-familyOpeccelinæ is emended and a key to genera of the sub-familyOpecœlinæ is given.
pp 76-90 February 1937
The morphology and asexual reproduction of a brackish-water Boloceroidarian from Madras, have been studied.
As the anemone differs from other known members of the Boloceroidaria in certain features of generic value, it is referred to a new genus,Boloceractis, under the family Boloceroididæ.
Generic and specific definitions ofBoloceractis gopalai are given and the anatomy of the anemone is described.
The mesenteries ofBoloceractis gopalai arenot sharply differentiated into macrocnemes and microcnemes; and the gonads are usually borne by the later cycles of imperfect mesenteries, the perfect mesenteries being typically sterile.
Asexual reproduction takes place in the anemone by a process of regeneration of the deciduous tentacles, the sphinctered partitions at the bases of the tentacles playing an important r∠le in this process.
An account of the habits of the anemone is given and the r∠le of the tentacular sphincter of the Boloceroidaria is discussed.
The systematic relationships of the genusBoloceractis are discussed.
pp 93-93 February 1937 Erratum