FLAGELLATA. 
Frot. 10 
Pouchet, G. Sur revolution des Peridiniens et les particularity d’organi - 
sation qui les rapprochent des Noctiluques. C. R. xcv. pp. 794-796. 
Pouchet obtained from the Mediterranean in the month of October, 
four or five miles from shore, and at a depth of 80-100 metres, examples of 
of three Peridinians, Ceratium tripos , with var. megaceros , and C. furca , 
exhibiting what was apparently a hitherto unrecorded genetic pheno- 
menon. Chains of two, three, and up to as many as eight individuals were 
found joined end to end. Their mode of union, in all instances identical, 
was accomplished through the insertion of the truncated extremity of the 
posterior spine of one zooid into the ventral depression of the succeeding 
individual. The examples so observed were perfectly motionless, and 
possessed neither flagellum nor cilia. 
Krassilstciiik, J. Zur Naturgeschichte und fiber die systematische 
Stellung von Chlorogonium euchlorum. Zool. Anz. v. pp. 628-934. 
The developmental history is thus recorded. The young produced from 
the resting cells, at first brick red, do not usually present the fusiform 
shape of the parent. As many as sixteen minute, irregularly scattered 
pulsatory vacuoles were counted in the mature individuals. Reproduc- 
tion takes place by successive fission ; the entire contents of the capsule 
divide into from four to. thirty-two parts, according to the generation to 
which the individual belongs ; the cilia persist, and the movements of the 
individual are not interrupted until from fifteen to thirty minutes 
before the emergence of the young, or fission products, when the flagella 
disappear ; the maternal envelope gradually dissolves, while the young 
move over each other, each possessing a delicato investing membrane. 
Tho first generation divides into eight, and tho second into four fission 
products, forming the “ macrogonidia” of Cicnkowski. About ten days 
after an infusion is made, the progeny of the division into four again 
divide into thirty-two smaller individuals, or “ microgonidia.” After a 
short free existence, themicrogonidia conjugate in pairs, fusing and form- 
ing a heart-shaped mass, which, in from fifteen to thirty minutes, ceases 
to move, and becomes a globular cell about 0.008 mm. in diameter ; the 
flagella then disappear, and the cell grows to a diameter of 0.013 to 
O. 015 mm., and is invested by a rigid membrane. If the spherical cells 
produced by conjugation are dried and then moistened with water, the 
contents divide in four pieces which form young Chlorogonia , and becom- 
ing free, complete the cycle. 
. Zur Entwickluugsgescliichte und Systematik der Gattung Poly- 
torncij Ehr. L. c. pp. 426-429. 
A new species, Polytoma spicatum , having a more slender form than 
P. uvella, and with a pointed posterior extremity, is described. Its 
developmental pbonomona are thus recorded : — Tho young issuing from 
the resting capsules grow to twice their original size, and then divide 
by fission into eight fragments, which remain for a time within the 
parental membrane, and occupy its entire cavity ; the flagella of the 
parent cell likewise remain intact, and there is no interference with its 
ordinary locomotion. The parent membrane finally splits, releasing the 
