[reports Dealing With the Systematic Geology And Paleontology of Maryland.]
[reports Dealing With the Systematic Geology And Paleontology of Maryland.]
Maryland Geological Survey
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Occurrence. — Aquia Fobmation. 2 miles below Potomac Creek. Collection, — Maryland Geological Survey. ScALA SESSiLis Conrad. Plate XXVIII, Fig. 11. Scala sesHlU Conrad, 1833, FoBsil SheUs of the Tertiary, No. 4, p. 45. Description. — " Subulate, with rather thick longitudinal costae, and minute crowded spiral lines; whorls nine, sessile or contiguous; base of the body whorl carinated.^^ Conrad, 1833. Occurrence. — Aquia Formation. 2 miles below Potomac Creek. Collection. — Maryland Geological S...urvey. SCALA CARINATA Lea. Plate XXVIII, Fig. 12. Scala carinata Lea, 1833, Contrlb. to Geol., p. 116, pi. Iv, fig, 103. Description. — " Shell conical, closely ribbed, carinate on the inferior part of the last whorl; substance of the shell thick; spire elevated. Digitized by Google MAKYLAND GEOLOGICAL SURVEY 155 pointed; ribs about twelve, lamelliform; whorls six, rounded; mouth round." Lea, 1833. Occurrence. — Aqula Formation. 2 miles below Potomac Creek, Up- per Marlboro. Collection, — Maryland Geological Survey.
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