288 Systematic Paleontology — Middle Devoniax 



margin of the lip, and the absence of all markings on this part of the 

 shell except striae of growth." Hall, 3 879. 



In the Maryland Collection is a single smooth, broken and poorly pre- 

 served internal impression which is doubtfully referred to this species. 

 Hall states that " It is not rare in the form of casts near Cumberland, 

 Md." (Pal. N. y.. vol. V, pt. ii, p. 103) and on comparison the specimen 

 was found to agree as nearly with the interior views of some of the type 

 specimens of this species in the office of the New York State Paleonto- 

 logist as with those of any other species. 



Length, about 32 mm.; width of expanded part of lip more than 

 35 mm. 



Occurrence. — Eomney Formation, Hamilton Member. Western 

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



Collection. — Maryland Geological Survey. 



Genus CYRTOLITES Conrad 

 Subgenus CYRTONELLA Hall 



Cyrtolites (Cyetonella) mitella Hall 

 Plate XXXVT, Figs. 4-7 



Cyrtolites (?) milella Hall, 1861, Descriptions of New Species of Fossils, 



p. 33. 

 Cyrtolites miteJla Hall, 1SC2, Fifteentli Rep. N. Y. State Cab. Nat. Hist., p. 61. 

 Cyrtolites mitella Hall, 1876, Hlustrations of Devonian Fossils: Gasteropoda, 



pi. XXV, figs. 16-18. 

 Cyrtolites mitella Hall, 1879, Pal. N. ¥., vol. v, pt. ii, p. 123, pi. xxv, figs. 23-28. 



Description. — " Shell arcuate, subovoid, making altogether less than 

 two volutions in the same plane: the first volution very minute; the body- 

 whorl rapidly expanding to the aperture, which is nearly circular; the 

 peristome scarcely spreading; the shell carinate, and the casts obtusely 

 but distinctly angular on the dorsum; apparently not sinuate or but 

 slightly undulated on the anterior margin. Surface marked by regular, 

 sharply elevated, subparallel, transverse striae, which are comparatively 

 distant (at least twice or tlirice tlieir width) near the apex and on the 

 upper part of the outer \(ilution, but become more crowded towards the 

 front of Ihe slicll: on the ujipcr ])art and sides of the slicll the inter- 



