Excerpt from The Monthly Microscopical Journal, Vol. 14: Transactions of the Royal Microscopical Society, and Record of Histological Research at Home and Abroad
For its examination a power of five or six hundred is desirable, although its general features may be studied with a 4/10ths objective. Its surface is studded with considerable regularity by minute, upstanding, firm elevations resembling cells, but apparently quite structureless. Beneath this layer and looking like a changed condition of its deepest part, are granules of uniform size and symmetrical arrangement, in rows corresponding with and transverse to the longitudinal axis of the body; the latter being most marked, gave a striated appearance, reminding one of striped muscle; at other times by a slight alteration the resemblance to the markings of a Pleurosigma was most striking. Beneath this layer is a thin. structureless membrane, by a reflexion of which a space near the mouth is cut off from the main body; this space, together with the general interior of the creature, is occupied by a granular protoplasmic substance mixed with clear droplets. The mouth has three lips, and leads into a slight depression or pharynx, often deepened by retraction into the space above mentioned. On the middle of the ventral surface is an oval sucker, in size about a third the diameter of the body: transverse striation is very distinct in its central depressed part. Behind the sucker a clear, elongated, curved space was frequently seen in the interior of the body, which space, after remaining some time, appeared suddenly to collapse. On the dorsal surface a little in front of the sucker was situated a somewhat stellate space, over which the surface of the body was depressed. These spaces perhaps represent a rudimentary water-vascular system. Near the sucker, in all specimens examined, were three minute spherical concretions of unequal size, moving freely in the general substance; they were the only parts that showed double refraction under polarized light, under which they were very conspicuous. On the under surface near the mouth was an elevation with a notch at its posterior margin; at the attached end close to the spheres were two diffused masses of greater opacity and granularity.
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