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No. 3.] ALLOLOBOPHORA FOETIDA. A97 
be formed by each worm subsequent to copulation.!. The fact 
that both cocoons are formed during copulation seems to indi- 
cate that another function must be found for the spermathecae; 
and yet these, when crushed on a slide, stained and mounted, 
are found to be packed with spermatozoa. If one taken from 
a breeding worm is placed on a dry slide and pressed with a 
needle, its contents flow out in the form of a thick, viscid, 
cloudy fluid. Adding a few drops of water to this fluid and 
examining it under the microscope, shows it to be a mass of 
extremely active spermatozoa, the tails moving very rapidly and 
propelling the heads, which remain straight. When these 
spermatozoa are mounted and stained, comparative measure- 
ments indicate that they have reached the same stage of 
development as those in the spermatophores and seminal fluid 
of the slime-tube. Careful measurements have been taken of 
the various parts of several hundred spermatozoa found in the 
seminal vesicles, spermathecae, spermatophores, seminal fluid 
of the slime-tube and freshly deposited cocoon,” with the hope 
of determining whether the spermatozoa in the cocoon are from 
the spermathecae, but the differences in size were too slight to 
be of any value as a determining factor. An examination of 
the spermathecae of worms having just deposited their cocoons 
seemed to promise the only decisive answer. Thus far I have 
been able to examine the spermathecae of only three worms 
1 In studying the literature I have been able to find only one report that sug- 
gests the cocoons being formed during copulation, vz., Vogt u. Yung. (Verglei- 
chende Anatomie, pp. 481, 482). “ Wahrend der Begattung legen sich die beiden 
Wiirmer mit ihrer Bauchseite in entgegengesetzter Richtung derart an einander, 
dass der Kopf des einen dem Schwanze des anderen zugekehrt ist und dass die 
Geschlechtsoffnungen mit dem Giirtel wechselseitig in Beriihrung sind. Der in 
Form von kleinen weisslichen Massen ergossene Samen nimmt in zwei durch eine 
Vertiefung der Korperdecken gebildeten Langsrinnen die Gestalt kurzer Cylinder 
an und fliesst so zum Giirtel, um sich von dort in die Samentaschen zu begeben. 
Die beiden Wiirmer sind alsdann durch einen Ring von Schleim mit einander 
verbunden, der vom Giirtel und vielleicht auch von den Nebendriisen abgeson- 
dert wurde, deren Gegenwart in der Nahe der Geschlechtsorgane wir erwahnt 
haben. Die durch die Miindungen der Eileiter ausgetretenen Eier gelangen zum 
Giirtel, wo sie von Schleim eingehiilt werden, in welchem man Samenthierchen 
wahrnimmt und der fiir sie eine Kapsel von eirunder Form bildet.” 
2 In these the length of the spine has been found to vary from 4u to 7u, head 
24u to 34u, middle-piece 2u to su, tail 544 to 67u. The longest head found in the 
fertilized egg measured 34u. 
