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MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 
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It is probable that the list of Infusoria will eventually be considerably enlarged when special 
attention is given to the subject. Our own examinations of water from Wandering Willie’s Spring, 
Mammoth Cave, taken May 3, 1874, and at once examined, revealed three forms of holotrichous 
Infusoria, which, however, we were unable to identify even generically. 
No. 1. Vibrio. Observed in the water taken from Wandering Willie’s Spring. 
No. 2. Colpoda f . It was a ciliate infusorian, rounded oval, with well-marked cilia all over the 
surface. This was the largest form observed. 
No. 3. Nassula f , or Prorodon ?. Was common in the water, and about half as large as No. 2. 
It is regularly oval-cylindrical, rounded at each end ; the cilia are short and very minute, scat¬ 
tered over the body. There are two round contractile vesicles and a long rod-like nucleus. 
No. 4. This form is longer than any of the others; long, oval-cylindrical, with long sparse 
cilia, and a distinct mouth-opening; it is more like Paramecium than any of the other forms. 
VERMES. 
" Voetex f cavicolens Pack. 
Vortex cavicolens Pack., Amer. Naturalist, xvii, 89, January, 1883. 
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Fig. 5. Planarian 'Worm, Carter caves: a, dorsal; 5, ventral, 6 x magnified; c. natural size, ventral; p, proboscis. (Gissler del.) 
This Rhabdoccelous worm was found in a brook in X Cave, one of the Carter caves, Kentucky. 
It belongs near Vortex, and it may provisionally be called Vortex cavicolens. The body is flat, 
elongated, narrow, lanceolate-oval, contracting in width much more than is usual in Vortex. The 
pharynx is situated much farther back from the anterior end of the body than usual in Vortex, 
being placed a little in.front of the middle of the body ; it is moderately long, being oval in out¬ 
line. The body behind suddenly contracts just before the somewhat pointed end. The genital 
outlet is about one-half as wide as the pharynx and orbicular in outline. Though described from 
two alcoholic specimens, I can discover no eyes, nor do I remember seeing any when it was living; 
it was when alive white, and apparently eyeless. Length, 4 miu ; breadfh, 1.5 mm . Found by us 
in X Cave, one of the Carter caves, eastern Kentucky. 
This worm may not prove to be a genuine Vortex, the species of which are broad and blunt in 
front, with the pharynx much nearer the front end than in the present species, which is therefore 
only provisionally placed in the genus Vortex. In Vortex coscus CErsted, the eyes, as the specific 
name implies, are wanting, but most of the species have eyes. As our species occurred in a 
brook in a dark cave, it would naturally, as in the case of the Mammoth Cave eyeless white Plana- 
riau, be eyeless, and as a consequence of losing its eyes become white. Schultze, in his Naturge- 
schichte der Turbellarien, states that Vortex viridis in winter was generally without chlorophyl 
bodies and wholly white, but that in April the white individuals are rare. He then adds; “ Kept 
for a considerable time in darkness, the green animals become, through bleaching and the disap¬ 
pearance of the chlorophyl, almost colorless.” 
Upon sending the above description of the single alcoholic specimen to Professor von Graff, 
of Aschaflfenburg, he very kindly replied as follows: 
As to the systematic position of the doubtful Turbellarian, X can, unfortunately, not form a precise opinion. 
According to your short description it may he a Vorticide or Mesostomide, and it would seem to correspond to the last 
family in the flatness of the body and the size, since there are few Voriieid® so flat and large. 
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