Maryland Geological Survey 175 



one at one side. This specie-s is distinguished by its shape, size, strong 

 plications, broad sinus and fold towards the front of the shell marked by 

 from four to six plications. 



Length of Maryland specimen, 26 mm.; width, 31 mm. 



Occurrence. — Eomney Formation, Hamilton Member. Western 

 Maryland; on tlie Eomney-Hanging Kock Eoad about ^ mile north of 

 Romney, W. Va. 



Collections. — Maryland Geological Survey; American Museum of Nat- 

 ural History. 



Camauotoechia sp. 

 Phxte XV, Fig. 5 



Description. — The figured exfoliated ventral valve does not agree 

 closely with figured specimens ; but Prof. Schuchert and Dr. J. M, Clarke, 

 both of whom have seen the specimen, agree that it is better not to 

 describe it as a new species. The shell is of medium size ; sinus deep and 

 well marked, containing three rather large and prominent plications; 

 sides with three or four plications which are elevated and conspicuous 

 near the margin. In some respects the specimen resembles CamarotoecJda 

 congregata (Con.) ; but the lateral plications are stronger and more 

 highly raised at the margin, in this respect something like Pugnax. Dr. 

 Clarke also suggested that it be compared with C. sappho Hall. 



Length, 17 mm. ; width, 17 mm. 



Occurrence. — Eomney Formation, Hamilton Member. Flintstone 

 Creek in Gilpin; Williams Eoad | mile east of Queen City Hotel, Cum- 

 berland. 



Collection. — Maryland Geological Survey. 



Genus LIORHYNCHUS Hall 



LiORHYNCHUS LIMITARE (Vanuxem) 



Plate XV, Figs. G-S 



Orthif: limltaris Vanuxem, 1842, Geol. N. Y., pt. iii, p. 146, fig. 3. 

 Atrypa limitaris Hall. 1843, Geol. N. Y., pt. iv, p. 182, flg. 11. 

 Atrijpci. limitaris Rogers, 1858, Geol. Penna., vol. ii, pt. ii, p. 826, flg. 652. 

 Leiorhynchus limitaris Hall, 1860, Thirteenth Rep. N. Y. State Cab. Nat. 

 Hist., p. 85. 



