.AlAinLAXD Gl-OLOGICAL SURVEY 675 



Description. — " Shell rolmst, suhilcprrsscil-coiiJLul. N'oliiiiiHis al)ont 

 four, snbaiigular, llic last one becoming very ventricose, tlattcncd from 

 the suture to the first carinate elevation on the upper side, and marlvcd 

 by moderately elevated carinate ridges, of wliich two or three are visible 

 on the upper volutions, and about five on the body whorl ; those on the 

 upper side of tlie vohitinii more disiaiil than those on the hiwer side. 

 Surface marked by line, closely ari'anged strine of growth, which are 

 sometimes crowded in fasciculi, giving gentle inequalities; these stri;e 

 and directed a little backward from the suture." Hall, 1879. 



Length 25 mm. ; diameter 17 mm. 



This species is referred to the subgenus Gyronema Ulrich on account 

 of its ornamentation, which diifers from that of Trochonema s( iisii slricto. 

 A rare species in the Ghcmung. 



Occurrence. — Jennings FoniiAJiox, CiiKMrNo Me^^ibek. Hancock, 

 2223. 



Collection. — [Maryland Geological Survey. 



Order CTENOBRANCHI ATA 



Suborder PLATYPODA 



Superfamily GYMNOGLOSSA 



Family PYRAMIDELLIDAE 



Genus MACROCHILINA Bayle 



Macuochilina pulchella n. sp. 



Plate LXVIII, Figs. 14, 15 



Description. — Shell diminutive, tapering quite abruptly, apical angle 

 45°, whorls 4-5, smndih. regularly convex; body whorl very oblique and 

 baving about two-tbii'ds the length of the entire shell. Last suture ob- 

 ]i(|ue, earlier sutures more transverse. Height of average specimen 7 

 mm., width (if body whorl .';.5 mm. This little species is distinguished 

 bv the characters mentioned from other known members of the genus. 



Occurrence. — Jennings Foemation, Chemung Member. Li rotten 

 sandstone on the' Williams Eoad, Polish Mountain. 



Collection. — Maryland Geological Survey. 



