. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 196 BULLETIN OF THE outer lip. Aperture shaped as in muscorum, liaving a single small parietal denticle. Altitude 3}, diameter I3 mm. Pupa syngenes, Tilsbry, The Nautilus, 1890, Vol. IIL p. 296, Plate V. Figs. 1, 2. Two specimens of this form are before me, and I am in doubt whether to give them a new name, as tliey may be only sinistral monstrosities of the common P. muscorum. The shells are labelled "Arizona" in the Academy collection, col- lector not known. (Since tlio above paragraphs were in ty
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 196 BULLETIN OF THE outer lip. Aperture shaped as in muscorum, liaving a single small parietal denticle. Altitude 3}, diameter I3 mm. Pupa syngenes, Tilsbry, The Nautilus, 1890, Vol. IIL p. 296, Plate V. Figs. 1, 2. Two specimens of this form are before me, and I am in doubt whether to give them a new name, as tliey may be only sinistral monstrosities of the common P. muscorum. The shells are labelled "Arizona" in the Academy collection, col- lector not known. (Since tlio above paragraphs were in type, I have received a communication from my friend, Dr. V. Sterki, to whom I sent a specimen of P. syngeties, which I at first described as a variety of muscorum. He says: — " I am satisfied that it is a species, and not a var, of muscoruvi; the shape of the whole shell, tlie last whorl so considerably flattened, and ascending, the number of wliorls, seem to me to prove its specifical rank. . After washing out tlie aper- ture of your specimen, I saw a rather strong lamella or tooth on the columella, and a barely perceptible trace of an inter-palatal lamella, which, however, is validified by the impression on 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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