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as Infusoria flagellata. 199 
but yet had neither the sigmoid curve of the latter nor its 
stout and rigid aspect, but was much more delicate, and in 
fact still exhibited a slight tremulous motion. The two con- 
tractile vesicles (cv) of each body were as distinct as those of 
the adult, and had the same proportionate size and relative 
position. 
In a very few minutes the two resultants were totally sepa- 
rated and divergent from each other at a sharp angle; and in 
less than half an hour after the last time noted, they had as- 
sumed the proportions of the other members of the colony. 
Shortly after the investigation of the phase just described, the 
last stages of self-division of another body, belonging to the 
same colony, were observed ; and thus the group, which within 
two hours before consisted of five individuals, was increased to 
eight (fig. 7). It seems to be a rare occurrence that so many 
bodies remain long together, since it very seldom happens that 
more than four or five (fig. 8) are found in a colony ; and now 
and then, in such instances, I have seen an individual drop off 
and swim away. When we meet with them settled down 
upon some point, amidst others which have scarcely any stem 
and those which are seated on very short peduncles, it becomes 
perfectly clear that they are there for the purpose of secreting 
a new support from the posterior end. 
§ 7. SALPINGGCA*, nov. gen. 
Salpingeca gracilis, nov. sp-— Pl. VI. figs. 38, 39. 
The difference between this genus and Codoneca has already 
been pointed out. It might well be compared to a stemless 
Codosiga (§ 6) enveloped in a sheath. I have met with three 
quite ie species of this genus, of which that under present 
consideration and another (S. amphoridium, nov. sp., §9) are 
freshwater denizens, and the third (S. marina, nov. sp., § 8) 
is a marine inhabitant. , S. gracilis (figs. 88, 39) was found 
upon only one occasion, and then in an old aquarium, which 
could not be said to be in a perfectly healthy condition, al- 
though its contents were by no means putrid. 
The body is yellow, and has a cylindrical shape, about four 
times as long as broad, ed: and rounded behind, and 
rounded-truncate in front. Like Codosiga it bears a filmy, 
membranous, colourless collar (6), which is attached to the 
extreme edge of the frontal area (fr), and rises to a height 
which is equal to two-thirds of the length of the body. The 
outline of the collar is generally cylindrical, and truncate 
at the distal end, but still is subjected to various degrees 
* oadmiyé, a trumpet ; oikéw, to inhabit. 
