. The cave fauna of North America, with remarks on the anatomy of the brain and origin of the blind species. Cave animals; Caves. 48 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. individuals become long-limbed and blind. There is apparently no struggle for existence, but the direct influence of darkness, united with heredity, are plainly the immediate agencies in the trans- formation. Family PHALANGIDiE. Phalangodes robust a Simon. Plate XIV, figs. 2, 2a, 26. iii, 164, Scotolemon robustum Pack. Bull. Hayden's U. S. Geol. Surv. Terr. Phalangodes robusta Simon, Araclinides de France, 150,
. The cave fauna of North America, with remarks on the anatomy of the brain and origin of the blind species. Cave animals; Caves. 48 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. individuals become long-limbed and blind. There is apparently no struggle for existence, but the direct influence of darkness, united with heredity, are plainly the immediate agencies in the trans- formation. Family PHALANGIDiE. Phalangodes robust a Simon. Plate XIV, figs. 2, 2a, 26. iii, 164, Scotolemon robustum Pack. Bull. Hayden's U. S. Geol. Surv. Terr. Phalangodes robusta Simon, Araclinides de France, 150, 1879. This species is here referred to at length, because it is the ooly out-of-door species of the genus yet known in the West; and by reference to the figures and description it will be seen how much the cave forms differ from it. Eight females?. Tegument deep reddish, with the hinder segments finely bordered with brown; tarsal joints paler, with dense blackish specks; cephalothorax a little paler red, marbled with reticulated darker lines. Body pyriform, two-thirds as long as broad; cephalothorax a little more than half as long as wide, the front edge slightly rounded, with the angles well marked. The eye-tuberele not so large and high as in 8. terri- cola Simon, being of moderate size. Eyes black and large, fully developed, while those of 8. terricola are nearly obsolete. Abdomen a little longer than broad; the first five segments well marked, the sutures being much more distinct than in 8. terricola or probably any other European species, judging by Simon's drawings. The last three segments, with the outer edge of each segment, free, not united with each other, as are the five basal joints; last segment with the ventral slightly projecting beyond the tergal portion. Beneath are seven well marked sterna, the first and second being united without suture. Chelicerse of the usual form, rather stout at base of first joint, but much as in 8. terricola; second joint moderately lo
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Keywords: ., bookauthorpackarda, bookcentury1800, bookdecade1880, bookyear1888
