. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. POLYGYRA. 283 *' The (li<j;estivc system is also very much elongated. The oesophagus especially is excessively long, as are also the ducts to the salivary glands. Tliis species is extremely common all over St. Augustine and its vicinity. Tho lar<ie Conn I found almost restricted to the moat of the old fort, especially at the foot of the main western P. ctreolus, enlarged. Polygyra cereolus, Muhlfeldt. Shell broadly umbilicated, subcarinated, discoidal, white, scarcely convex, and with rib-like st
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. POLYGYRA. 283 *' The (li<j;estivc system is also very much elongated. The oesophagus especially is excessively long, as are also the ducts to the salivary glands. Tliis species is extremely common all over St. Augustine and its vicinity. Tho lar<ie Conn I found almost restricted to the moat of the old fort, especially at the foot of the main western P. ctreolus, enlarged. Polygyra cereolus, Muhlfeldt. Shell broadly umbilicated, subcarinated, discoidal, white, scarcely convex, and with rib-like stria? above, smooth and plane below; whorls 7 or 8, gradu- ally increasing, the last subcarinated, briefly deflected at the aperture, constricted behind the peristome; below Fig. 181. three full whorls revolving on the same plane, the bal- ance visible in the broad, pervious umbilicus, the penul- timate somewhat lapped over by the last, the antepenul- timate the most swollen ; aperture remote from the axis, subreniform; peristome white, thickened, acutely re- flected, somewhat angular at the carination of the last whorl, continuous, its terminations joined by triangular, elevated, acutely pointed callus ; on the parietal side of the inner fourth of the last, and running round rather obliquely within from two thirds to three fourths of the penultimate whorl, thus revolving nearly once round the shell, is a thread-like, elevated, white internal lamina. Greater diameter 14, lesser, 12^ mill.; height, 3| mill. A large specimen, 20 greater diameter. Melix cereolus, Muhlfeldt, Berlin Mus., VIII. (1816), 41, PI. 11. Fig. 18.— Pfeiffer, Mon. Hel. Viv., I. 408 ; in Chemnitz, ed. 2, I. 378, PI. LXVI. Figs. 1-3.— ?Reeve, Con. Icon., 698.—Bland, Ann. N. Y. Lye, VII. 136, Fig. 2. — W. G. BiNNEY, Terr. Moll., IV. 80, part, PL LXXVII. Fig. 23 ; L. & Sh., I. 106, Fig. 182 (1869). ffelix septemvolva, ? F^.russac, Hist., PI. LI. Fig. 6.—?Wood, Index Test. Suppl., VII. Fig. 14
Size: 1172px × 2132px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
