. The cave fauna of North America, with remarks on the anatomy of the brain and origin of the blind species. Cave animals; Caves. MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 27 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 May3, 1874, and at once examined, revealed three forms of holotrichous Infusoria, which, however, we were unable to identify even geuerically. No. 1. Vibrio. Observed iu the water taken from Wandering Willie'
. The cave fauna of North America, with remarks on the anatomy of the brain and origin of the blind species. Cave animals; Caves. MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 27 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 May3, 1874, and at once examined, revealed three forms of holotrichous Infusoria, which, however, we were unable to identify even geuerically. No. 1. Vibrio. Observed iu the water taken from Wandering Willie's Spring. No. 2. Colpoda ? . It was a ciliate infusoriau, rounded oval, with well-marked cilia all over the surface. This was the largest form observed. No. 3. Nassula ? , 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. Vortex ? cavicolens Pack. Vortex cavicolens Pack., Auier. Naturalist, xvii, 89, January, |^ Fig. 5. Plauariou Worm, Carter cares: o. dorsal; 6, ventral, 6 x maguifito : c natuial size, ventral; p, prr lioscia. (Gissler del.) This Rhabdoccelous worm was found iu a brook in X Cave, one of the Carter caves, Kentucky. It belougs 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 of the middle of the body ; it is moderately long, being oval in out- line. The body behind suddeuly contracts just before t
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