6G4: Systematic Palkoxtot.ogy — UrrEU Devomax 



Length of largest specimeu observed 2(}-2~y mm.; diameter at aperture 

 6-7 mm. 



The genus Ectomaria is regarded by Perner as synonymous with the 

 genus Sohnospim of Ulrich.' It closely approaches Hormotoma but dif- 

 fers in having the two revolving peripheral carinte more widely separated, 

 while there is no true peripheral band between them as in Hormotoma. 

 Again Hormotoma possesses only two revolving carin;e while Ectomaria 

 may have a larger number. This species differs from E. ecclesice in its 

 much larger size, more rounded volutions and in having .'5 or more revolv- 

 ing carinae. 



The specimens figured ajjparently differ in their apical angles. The 

 medium angle is correct. The drawings Avere made from squeezes and 

 the a])i)arent differences are imperfections due to this cause. 



Occurrence. — Jenxings Formation, Chemuxg Membek. Town 

 Creek, 2228. Parkhead Member. Williams Eoad, on Polish ^Mountain, 

 1660; 2 miles west of Pawpaw, 1493; 21/^ miles above mouth of Sideling 

 Hill Creek. 



Collection. — ]\raryland Geological Survey. 



Ectomaria ecclesi.i-: n. sp. 

 Plate LXVIT, Figs. 9-12 



Description. — Shell small, extremely terete. Whorls, at full growth 

 not less than 12, each bearing a prominent slit band witli elevated nuir- 

 gins, from which the surface of the whorl slopes abruptlv above and 

 below, the upper slope being twice the width of tlie lower. Sutures deep, 

 the whorls thus outstanding prominently and angularly. Surface marked 

 by fine raised concentric lines converging abruptly backward on the upjjer 

 and lower parts of the A\horl to meet the slit band. This ornament is 

 not retained on the casts from the sandstones. Length of average speci- 

 men 12 mm., width of body whorl ."5 mm. 



This species approaches closely .1/. micula Hall from the Hamiltoji 

 fauna of New York (see Pal. N. Y., vol. v, pt. ii, p. 9;5, pi. x.\i, fig. 11) 



'■ Syst. Sil. Boheme, vol. iv, th. li, p. 133. 



