. Annual report. New York State Museum; Science; Science. 242 NEW YORK STATE MUSEUM Corynoides curtus Lapworth var. comma nov. Plate 13, figures 5, 22-24 Corynoides curtus Ruedemann. N. Y. State Mus. Bui. 42. 1901. p. 526 Description. Rhabdosome very small (average 4 mm, maximal length 5 mm) and relatively wide (.6 mm), attaining its maximal width at half its length, strongly curved so as to frequently describe a quadrant, consisting of a small, inconspicuous sicula (.6 mm), which rarely is preserved, and three thecae. Thecae not diverging from the sicula ; of equal length. Aperture of the sic
. Annual report. New York State Museum; Science; Science. 242 NEW YORK STATE MUSEUM Corynoides curtus Lapworth var. comma nov. Plate 13, figures 5, 22-24 Corynoides curtus Ruedemann. N. Y. State Mus. Bui. 42. 1901. p. 526 Description. Rhabdosome very small (average 4 mm, maximal length 5 mm) and relatively wide (.6 mm), attaining its maximal width at half its length, strongly curved so as to frequently describe a quadrant, consisting of a small, inconspicuous sicula (.6 mm), which rarely is preserved, and three thecae. Thecae not diverging from the sicula ; of equal length. Aperture of the sicula plain, those of the thecae straight, normal to the axes of the thecae and provided with one mucro each, that is of the same character and direction as in the typical species. Nema present. Position and locality. Very common in the shales, exposed at the power house below Mechanicville. It is there asso- ciated with Glossogr. quadri m ti- er o n a t u s, D i p 1 o g r. f o 1 i a c e u s, ; corynoides curtus var. comma Climacogr. c a u d a t u s, and nuiTier- nov. Fig. 145-47 Common aspect of the form. Fig. 148 a larger specimen. x? ous mollusks indicating a horizon trans- itional between the Trenton and Utica formations or lying near the base of the Utica formation Remarks. In the above cited publication this form has been referred to C. curtus, but the constancy of its differential characters requires its recognition as a separate variety (or mutation). It differs from the typical curtus by its shorter and at the same time stouter form and its marked curvature, while the diminutive size of the sicula, the curvature and especially the obliquely outward direction of the apertural spines clearly indicate so close a relationship to C . curtus that the ends of taxonomy appear to be served best by retaining this form within the bounds of the typical Utica species of Corynoides. 145 146. Please note that these images are extracted from scanned page images that may have been digita
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