"In 1844, Dr. Tellkampf published a more extended description, with figures, in 'Müller's Archiv' for 1844, and mentioned several other animals found also in the Cave, among which the most interesting is the crustacean which he calls 'Astacus pellucidus,' already mentioned, but not described, by Mr. Thompson, President of the Natural History Society of Belfast. Both Thompson and Tellkampf speak of eyes in these species, but they are mistaken. I have examined several specimens and satisfied myself that the peduncle of the eye only exists; but there are no visible facets at its extremity, as in other crawfish. "Mr. Thompson mentions, further, crickets, allied to 'Phalangopsis longipes,' of which Tellkampf says that it occurs throughout the Cave. Of spiders, Dr. Tellkampf found two eyeless, small white species, which he calls 'Phalangodes armata' and 'Anthrobia monmouthia'; flies, of the genus 'Anthomyia'; a minute shrimp, called by him 'Triura cavernicola'; and two blind beetles; 'Anophthalmus tellkampfii' of Erichson, and 'Adelops hirtus;' of most of which Dr. Tellkampf has published a full description, and figures in a subsequent paper, inserted in Erichson's 'Archiv,' 1844, p. 318. "The infusoria observed in the Cave resemble 'Monas Kolpoda,' 'Monas socialis,' and 'Bodo intestinalis,'--a new Chilomonas, which he calls 'Ch. emarginata,' and a species allied to 'Kolpoda cucullus.' "As already mentioned, Dekay has referred the blind fish, with doubt, to the family of Siluridæ. Dr. Tellkampf, however, establishes for it a distinct family. Dr. Storer, in his 'Synopsis of the Fishes of North America,' published in 1846, in the 'Memoirs of the American Academy of Arts and Sciences,' is also of opinion that it should constitute a distinct family, to which he gives the new name of 'Hypsæidæ,' page 435. From the circumstance of its being viviparous, from the character of its scales, and from the form and structure of its head, I am inclined to consider this fish as an aberrant type of my family of Cyprinodonts." The effect of long-continued darkness upon visual organs has had some remarkable illustrations. At one time an idea prevailed in America that caves possessed certain curative properties, and afflicted people remained in them; but the absence of light proved disastrous to many. It is recorded that those patients "who remained in the cave three or four months presented a frightful appearance. The face was entirely bloodless, eyes sunken, and pupils dilated to such a degree that the iris ceased to be visible, so that, no matter what the original colour of the eye might have been, it soon appeared black."