. The Conchologists' exchange. Mollusks. THE NAUTILUS. 65 A NEW RISSOA FROM BERMUDA. BY E. G. VANATTA. RiSSOA (NODULUS) STEWARDSONI, 11. Sp. Fig 1. The shell is very minute, wslightly rimate, thin, pale yellowish corneous, smooth, slender, regularly tapering from the last whorl to the very obtuse summit. Whorls 4^, moderately convex. Aper- ture semi-rotund, subvertical, the peristome continuous, inner margin nearly straight, the outer regularly curved. Length , diam. , length aperture .55 mm. Types No. 99041, A. N. S. P., from Fairyland, near Hamilton, Bermuda, near the shore, collected
. The Conchologists' exchange. Mollusks. THE NAUTILUS. 65 A NEW RISSOA FROM BERMUDA. BY E. G. VANATTA. RiSSOA (NODULUS) STEWARDSONI, 11. Sp. Fig 1. The shell is very minute, wslightly rimate, thin, pale yellowish corneous, smooth, slender, regularly tapering from the last whorl to the very obtuse summit. Whorls 4^, moderately convex. Aper- ture semi-rotund, subvertical, the peristome continuous, inner margin nearly straight, the outer regularly curved. Length , diam. , length aperture .55 mm. Types No. 99041, A. N. S. P., from Fairyland, near Hamilton, Bermuda, near the shore, collected by Mr. Stewardson Brown, asso- ciated with Melanipus coffea and Jlavus^ Leiiconia occidentalis Pfr., Blaiineria^ Alexia^ Detracia^ Pedipes, Carychium, Cacilioides^ ^\fi- daria, Thysanophora^ Polygyra microdonta, and many other land Fig. 1. Fig. 2. This tiny snail has the appearance of the terrestrial genus Acme. It is apparently a shore shell, as it was not found with any typically marine forms. It seems to be most closely related to the Medi- teranean and Adriatic R. epidaurica Brusina, from which it differs by the more slender contour, more tapering spire and mere convex whorls. R. epidaurica is decidedly more cylindrical. For com- parison a figure is given (fig. 2) of a specimen of R. epidaurica re- ceived from Professor Brusina, from Ragusa, Dalmatia (No. 59,- 898 A. N. S. P.) R. glahrata Muhlf. is more conical than stewardsoni, with the aperture more 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
