Description: English: Plate III Fig. 1. Caecidotea stygia Pack. Drawn by J. S. Kingsley from a specimen exactly like one from Mammoth Cave; the details drawn from a Mammoth Cave specimen, la, larger antenna ; 1b, cercopod, 2 ; lc, cercopod, J 1 ; Id!, one of the terminal setae, much larger than the others and bulbous at the end. Fig. 2a. C. stygia. — Antennule of short form from the Labyrinth, Mammoth Cave ; 26, end of 2a, with the three olfac- tory rods; 2c, 9 antennule ; ol., olfactory rods; 2d, the same, enlarged, showing the four terminal joints filled with nerve cells (n. cells), and the auditory bristle (and. s) ; 2e, first maxilla (of authors) ; 2/, the same enlarged, the outer lobe bearing ten or eleven 6imple setae, the inner lobe five spinulated setae ; 2g, second maxilla (of authors); 2ft, end of same, enlarged, each of the two outer lobes bearing on the inner edge six or seven curious comb like setae (not very well represented in the plate), the other setae transversely stri- ated; 2i, the second pair of appendages behind the mandibles (first maxilla?). Fig. 3, 3a. C. stygia Forbes, from a well in Illinois. — Second joint of antennule, with three auditory bristles ; 3a', three basal joints of antennule from a Mammoth Cave individual, with an auditory bristle on the basal and two on the second joint. Fig. 4. C. stygia, from Annville, Pennsylvania. — Antennule of seventeen joints — 4a, end of the same, with six olfactory rods, three of which are on the sixth joint from the end. Fig. 5. C. stygia, from Long Cave. — Antennule ; 5a, antennule of another individual from the same cave, with but eight joints; 5b,5c, antennae of the same; bd, a leg of the first pair, 2 adult, with eggs. Fig. 6. C. stygia, collected in daylight, 50 feet in from entrance of Walnut Hill Spring Cave, attennule; 6a, terminal joints of the same. Fig. 7. C. stygia, from Bradford Cave. — Antennule of ten to eleven joints. Fig. 8. C. stygia, from Carter (X) Cave — 8a, terminal joints of the antennule, with five olfactory rods. Fig. 9. C. nickajackensis. — Antennule; 9a, terminal joints. All the figures except one drawn by the author. Date: 1888. Source: Packard, A. S. (1888)
The cave fauna of North America, with remarks on the anatomy of the brain and origin of the blind species. Washington, National Academy of Sciences. Author:
Alpheus Spring Packard.
