. The Conchologists' exchange. Mollusks. THE NAUTILUS. 57 which is opaque white and smooth. Subsequent whorls are flattened but separated by a deep suture, the earlier ones having two spiral beaded cords. At the end of the first 3^ to 4 whorls a third spiral cord appears. The last whorl is rounded periferally, and has about 10 spiral cords, separated by spaces of about their own width ; the upper 5 or 6 are nodose at the intersections of low, narrow, vertical folds, which do not extend below the perifery. The last whorl has a low, rounded, rather massive varix behind the outer lip. Aperture ov
. The Conchologists' exchange. Mollusks. THE NAUTILUS. 57 which is opaque white and smooth. Subsequent whorls are flattened but separated by a deep suture, the earlier ones having two spiral beaded cords. At the end of the first 3^ to 4 whorls a third spiral cord appears. The last whorl is rounded periferally, and has about 10 spiral cords, separated by spaces of about their own width ; the upper 5 or 6 are nodose at the intersections of low, narrow, vertical folds, which do not extend below the perifery. The last whorl has a low, rounded, rather massive varix behind the outer lip. Aperture oval, produced in a short, deep channel at the base. Length , diam. mm.; whorls 6^. Hilo, Hawaii. Types no. 95906 A. N. S. P., collected by Mr. D. Thaanum. This tiny Bittium is somewhat related to B. leucocephalum Wat-. FiG. 1. Fig. 2. Fig. 3. son, described from the reef at Honolulu, from which it differs in many details of shape and sculpture. Watson's type is evidently an immature shell, smaller than B. hiloense, but it has 8 whorls, while hiloense has but 6J. Torinia discoidea sterkii n. subsp. Fig. 2. The shell is depressed, biconvex with flat perifery, widely umbili- cate, the width of umbilicus contained times in that of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Averell, William D. Philadelphia, Wm. D. Averell
Size: 2034px × 1228px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
