. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Zonites caducus, Pfeiffer. cerinoideus, Anthont. Gundlachi, Pfeiffek. Found also in Texas, at Hidalgo, by Dr. Singley. Zonites Singleyanus, Pilsbky. Shell minute, broadly umbilicate, planorboid, the spire scarcely perceptibly ex- serted; subtranslucent, waxen white, shining, smooth, under a strong lens seen to be slightly wrinkled by growth-lines; whorls three, rather rap- idly increasing, separated by well impressed sutures, convex, the apex rather large; body whorl depressed, slightly descending, indented below arou
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Zonites caducus, Pfeiffer. cerinoideus, Anthont. Gundlachi, Pfeiffek. Found also in Texas, at Hidalgo, by Dr. Singley. Zonites Singleyanus, Pilsbky. Shell minute, broadly umbilicate, planorboid, the spire scarcely perceptibly ex- serted; subtranslucent, waxen white, shining, smooth, under a strong lens seen to be slightly wrinkled by growth-lines; whorls three, rather rap- idly increasing, separated by well impressed sutures, convex, the apex rather large; body whorl depressed, slightly descending, indented below around the umbilicus ; aperture small, semilunar, oblique; peristome simple, acute. Umbilicus nearly one third the diameter of the shell, wide, showing all the whorls. Alt. 1, diam. 2 mm. New Braunfels, Comal Co., Texas. Allied to Z. minusculus, but much more depressed, more shin- ing, smoother, smaller, with broader umbilicus and a complete whorl less than minusculus. This species, one of the most distinct of the smaller forms of Hyalina, was communicated to me by Mr. J. A. Singley, in whose Zoniteen^r|edyanUS' honor it is named. I have also found a few specimens among the shells collected by myself in Central Texas, during the winter of 1885-86. With Z. Singleyanus at New Braunfels are found quantities of Z. minusculus. The latter species exhibits some variation, being often more depressed than more northern specimens. This depressed form has been noticed in Mexico by Strebel, who pro- poses for Z. minusculus the new generic title of Chanomphalus, which is, of course, completely synonymous with Pseudohyalina, Morse, 1864, and this, again, is not dif- ferent enough from Hyalina to warrant the erection of a new genus or subgenus. There is some variation in the width of the umbilicus in Texan specimens of Z. mi- nusculus, but I have not seen specimens with it so wide as Dr. Dall indicates for his var. Alachuana from Florida. H. elegantulus, Pfr., is about the size and form of my Zon
Size: 1284px × 1947px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1890
