308 , TAKU KOMAI 
LITERATURE CONCERNING THE STRUCTURE AND DEVELOPMENT 
OF SPERMATOZOON OF THE STOMATOPODA 
In a paper dealing with the structure of the reproductive 
organs of Squilla mantis, Grobben (’76) described for the first 
time the spermatozoon of the Stomatopoda. He says it is 
‘“‘kugelig, vielleicht etwas abgeplattet, von ganz homogene 
Aussehn mit sehr schmalem lichterem Band und 0.008—0.0085 
Mm. im Durchmesser,”’ and, further, that if the spermatozoon 
be treated with acetic acid, there appears a highly refringent 
body, elliptical when seen en face, which he thought to be the 
head of the spermatozoon. 
_ Another work of the same author published two years later 
(78), concerning chiefly the male reproductive organs of the 
Decapoda, contains scattered acounts about the structure of 
the testis of Squilla mantis and, further, a brief description of 
the development of the spermatozoon. ‘The spermatid (‘Samen- 
zelle’), as described in that paper, has a spherical nucleus enclos- 
ing numerous nucleoli and surrounded by a faintly granular 
cytoplasm. At the commencement of transformation, the 
nuclear substance assembles toward one pole of the nucleus 
where the future head of the spermatozoon develops and takes a 
crescent shape. The substance next concentrates to form a 
hemispherical body which becomes homogeneous and refractive. 
Probably at the expense of the nuclear fluid, this body enlarges 
until it becomes spherical in shape and comes to lie at the center 
of the cell, whose cytoplasm also has now become homogeneous. 
In 1885 Carnoy described the maturation divisions of Squilla 
mantis. He observed that the spireme is segmented into from 
twenty to twenty-four chromosomes, which arrange themselves 
in the equatorial plate with their longer axis parallel to the 
spindle axis. Each of the chromosomes splits longitudinally in 
the next division. 
In the year following (1886), Gilson published a somewhat 
longer account of the spermatogenesis of Squilla mantis than 
that of Grobben referred to above. The testicular tubule is 
lined with a syncytial mass of cytoplasm which contains nuclei 
filled with clumps of chromatin. The mother-cells of the sper- 
