123 



Horizon and locality. In the sandstones and sandy shales of the Lower 

 Etcheninian rocks at Young point near Geoige River station of the Inter- 

 colonial Railway, N.S. This fossil and its associates are provisionally 

 assigned to Assise E. 2 a. 



LINGULELLA TCMIDA. PI. VI., figs. 6 a C. 



Lingulella tumida n. sp. Nat. Hist. Soc. Bull., vol. iv, p. 200, PI. 

 1, fgs. 2 a to c. 



The following is a fuller description of the species above cited. 

 Shell substance corneous. A small, round, thick shelled species. 



The ventral valve is broadly ovate, with a projecting beak, the valve Li 

 is rounded down regularly on all sides to the margin. In the example 

 figured the beak is broken away, and a mould of the cardinal area ex- 

 posed ; here a triple ridge rises abruptly to a slightly projecting elongated 

 tubercle in the middle ; it is the mould of a pit in the ped cle groove, 

 similar to that in Obolus and Obolella. 



The visceral cavity shows three grooves impressed upon it, of which 

 Ihe middle one, like the pedicle groove of the cardinal area, is triple. 

 This valve is deepest in the posterior third. 



Sculpture. The surface of the shell is marked by rounded concentric 

 ridges, some of which show a beaded crest. 



Size. Length, 6 mm.; width 5 mm.; depth 1 mm. 



Horizon and locality. Assise E 3 e, Upper Etcheininian, Dugald 

 brook, Escasonie, N.S. 



This species in its general form approaches Obolus, but the strong pro- 

 jecting umbo separates it. 



Lingulepis Martinensis of the Protolenus fauna is like this in form and 

 surface markings, but is much larger. Lingulella Ella H. and W. of 

 the Middle Cambrian of the West is like this in outline, but the surface 

 markings are finer. 



This species, L. tumida, is remarkable for the distinctness of the 

 channels on the callus, due to the sinews of the pedicle muscle. Even in 

 the pedicle groove these little grooves are seen. 



LlNGOLELLA LONGOVALIS n. Sp. PI. VII., figs. 3 af. 



A small elongately oval species approaching in form to Leptobolus. Lingulella 

 Ventral pointed, rather high along the median line in the posterior described, 

 half ; flatter toward the front margin. Interior. The hinge area is 



