Maryland Geological Survey 315 



half times the diameter at the last septum; aperture entire, without 

 special contraction or expansion; air-chambers regular, numerous, more 

 frequent than the annulations; with a depth of about three mm. Septa 

 smooth and thin ; sutures straight and horizontal, and bearing no uniform 

 relation to the frequency or curvature of the annulations; siphuncle sub- 

 central. Test very thin, rarely preserved; tube ornamented with promi- 

 nent annidations, which become more frequent and less marked toward 

 the apex; on the chamber of habitation the annulations are very sharp 

 and elevated, often curved and oblique ; the tube, for a distance of twenty 

 mm. or more back of the aperture, is cylindrical and without annula- 

 tions, but is marked by lamellose lines of growth. Surface marked by 

 fine, regular, sharp, continuous longitudinal striae, crossed by finer, 

 crowded, irregular striae, about fifteen to twenty longitudinal striae in 

 the space of two mm.; the internal mold is essentially smooth, with the 

 exception of the prominent annulations. This species is distinguished 

 from S. nuntium by its more prominent and less frequent annulations 

 and from S. caelamen by its continuous sharp, longitudinal striae and 

 more elevated annulations. 



The Maryland Collection contains a single, small and broken specimen 

 labeled simply Western Maryland, which apparently belongs to this species. 

 It is marked by similar prominent annulations and about the same dis- 

 tance apart, 6 mm. on this specimen, while the air-chambers are about 3 

 mm. apart, more frequent than the annulations and marked by continuous 

 longitudinal striae. It agrees well with specimens in the office of the State 

 Paleontologist of ISTew York which are labeled this species, as well as with 

 a portion of one of the type specimens.* Later, additional specimens were 

 collected from the localities named below. 



Occurrence. — Eomney Formation, Hamilton Member. Western 

 Maryland; Ernstville; W. Va. side Potomac River about 3 miles south 

 of Cumberland ; on road 1 mile north of Eomney, W. Va. ( ?) . 



Collections.— Maryland Geological Survey; New York State Museum; 

 American Museum of Natural History. 



' Pal. N. Y., vol. V, pt. ii, pi. 82, flg. 1. 



