Volume 13, Issue 3
March 1941, pages 135-228
pp 135-150 March 1941
A new species of a polysporous tissue infecting myxosporidian,Henneguya otolithi is described from the bulbus arteriosus of two species of a marine fish,Otolithus ruber andO. maculatus.
Two kinds of nuclei, the vegetative and generative, are present in the earlier stages of the parasite. The vegetative nuclei are not present in later stages.
The pansporoblasts originate by the copulation of anisogamous gametes.
Evidences of multiplicative reproduction by plasmotomy in young vegetative forms are seen.
Autogamy is present and instances of auto-infection have been observed.
The histopathological processes in the infected organ are described.
Diffuse infiltration of spores is common and scattered spores have been located in the kidney.
A seasonal variation in the occurrence of the different stages of the parasite is noted. In general a higher temperature seems to accelerate spore formation.
pp 151-156 March 1941
pp 157-162 March 1941
A brief description ofS. halepense and its relationship to the cultivated sorghums is given. The formation of rhizomes has been described. The inheritance of a few characters has also been recorded. Purple colour in the stigma is a monogenic dominant over the non-pigmented condition (yellow). Reduced filament is a simple recessive to the normal. The compact panicle was found to behave as a monogenic recessive to the loose paniele. Stray cases of extra-fertility of spikelets and ovaries with triple stigmas have been found to occur.
pp 163-167 March 1941
pp 168-170 March 1941
pp 171-192 March 1941
pp 193-228 March 1941
From the foregoing pages it is clear that the present form shows a number of interesting features in which it markedly differs from the other species of the genus. These characters seem to me of sufficient value for the creation of a new species for its reception and for which I propose the namePraegeria gopalai. The important characters of this species can now be summarised as follows:
Minute slender worm, 4 to 10 mm. long, with 25 to 50 setigerous segments; ventral cirrus of the buccal parapodium globular; ventral cirrus of the first setigerous foot slightly elongated; anal segment with two conspicuous groups of caudal glands; only a single pair of sperm-sacs, genital funnels and copulatory organs in the male; secondarily median testis enclosed in a membrane and often extending into two segments; tapering entire copulatory organ provided with a large spinous papilla sperm-sacs having double saccular expansions; in the female, one or two ovarian groups covered over by a membrane and each group extending into 6 to 15 consecutive segments; receptacula seminis and genital funnels corresponding to the number of ovarian groups; parapodia of the segment carrying the receptacula seminis completely atrophied and carrying only two acicula; sperms from the receptacula seminis nail shaped having developed a conspicuous terminal hood.
Locality: —Sandy Beach, Madras.
Holotype: —In the Indian Museum, Calcutta.