Maryland Gi:o logical Survey 663 



They are distinguished from the species of Loxonema with wliieii tliey 

 are associated by their extremely elongate, much narrower form. 



Occurrence. — Jekxixgs Forhatiox, Chemung Member. Along 

 Trout Eun, south of Oakland, and near Mountain Lake Park; along Green 

 Glade Eun, in Garrett Comity, and 7 miles west of Frostburg on the 

 National Eoad. 



CoUecilon. — Maryland Geological Survey. 



Genus HORMOTOMA Salter emend J. Donald 

 liOKMOlOMA BISTUIATA n. Sp. 



Plate LXVII, Fig. 4 



Description. — Shell elongate, turretiform, volutions G or more, en- 

 larging graduall)^, last volution scarcely more inflated. Sulcus deep, 

 volutions flattened on periphery. Surface ornamented by two revolving 

 strife bounding a concave band. 



Length 12 mm. ; diameter at aperture 5 mm. 



The exterior of a single specimen has been observed which does not 

 seem referable to any previously described species. 



Occurrence. — Jennings Formation, Parkhead Member. Two and 

 one-half miles above mouth of Sideling Hill Creek. 



Collection. — ]\Iaryland Geological Survey. 



Genus ECTOMARIA Koken 

 ECTOMARIA MAUYLANDICA n. sp. 



Plate LXVII, Figs. 5-8 



Description. — Shell elongate, turretiform; apical angle small, number 

 of volutions unknown, aperture subelliptical. Surface ornamented by 

 distinct, elevated, thread-like revolving carinae, 3 to 5 in number, 2 of 

 which bounding the peripheral band are slightly more elevated than the 

 others. Periplieral band al)out midway between the sutures or a little 

 nearer lower suture. One carina, or occasionally two, situated above 

 band and two, usually, below it. There are obscure indications of fine 

 transverse stria? on upper side of volution. 



